2026-11-04T10:56:39Z https://ejournal.brin.go.id/jsmi/oai

oai:ejournal.brin.go.id:article/185 2026-11-02T08:34:09Z jsmi:ART

Synthesis and Characterization of LaF3:Ce Scintillator Material Sukirman, Engkir Purwamargapratala, Yustinus Sugeng, Bambang Wahyudianingsih, Wahyudianingsih Gunawan, Indra Ahda, Syahfandi Sudjatno, Agus Dimyati, Arbi Scintillator materials LaF3:Ce Co-precipitation Synthesis and Characterization of LaF3:Ce Scintillator Material.Synthesis and characterization of the LaF3:Ce scintillator have been carried out. Synthesis was carried out using the co-precipitation method. In this study, the raw materials used were NaF, LaCl3•7H2O, and Ce(NO3)3•6H2O with ethanol and distilled water as a solvent; while surfactants were used oleic acid. In this study, the compound LaF3:0.2Ce was synthesized. The sample was characterized by using an X-Ray Diffractometer (XRD), a Scanning Electron Microscope (SEM), and a Spectrofluorometer. The analyzed data showed that the 82.6 weight fraction of LaF3:0.2Ce phase has precipitated accompanied by the formation of NaCl and C2Ce phases of 5.1 and 12.3 weight fraction, respectively. The NaCl phase is a by-product of the chemical reaction: xLaCl3•7H2O + zCeCl3•7H2O + 3NaF → LaxCezF3 + 3NaCl + 7H2O which could be removed from the precipitate solution by an appropriate separation method, while the C2Ce one appeared as a result of heating the sample at 400ºC. The LaF3:Ce scintillator sample shows the phenomenon of a bluish glow with a lifetime, t = 6 × 10-10 seconds even in the presence of a foreign phase. The existence of NaCl and C2Ce as a local environment still makes LaF3:0.2Ce has normal lifetime characteristics. BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/185 10.55981/jsmi.2023.185 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 1-6 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/185/1228 Copyright (c) 2023 Engkir Sukirman, Yustinus Purwamargapratala, Bambang Sugeng, Mrs. Wahyu, Mr. Indra, Mr. Ahda, Mr. Agus, Dr. Arbi https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/267 2026-11-02T08:34:09Z jsmi:ART

Effect of 2-Methylimidazole Composition as Low-Temperature Application in Phenol-Formaldehyde, Glycidyl Ether Epoxy Coating Paltgor, Rinush Fedrikdo Riastuti, Rini Ramdhani, Rizal Tresna Yunus, Muhammad 2-Methylimidazole Coating performance Low temperature Pile pipe The addition of materials to pile pipe at low temperatures is very challenging. Thereby, an optimum operating level is needed to produce a quality coating. Furthermore, 2-methylimidazole (2MI) was added into a phenol-formaldehyde, glycidyl ether polymer fusion bonded epoxy (FBE) coating at different concentrations of 1, 2, and 3 %wt. Thermal analysis was then carried out using differential scanning calorimetry (DSC), where the addition of 2MI decreased the curing temperature to 134.76°C due to the reduced activation energy. Potentiodynamic polarization showed the best corrosion rate of 0.00991 mm/year with a current density of 0.847μA/cm2 after adding 1 %wt 2MI. Electrochemical impedance spectroscopy (EIS) was carried out to determine the charge transfer resistance and maximum coating capacitor capacitance after adding 1 %wt 2MI, namely 9.9 kΩ and 8.45×10-5 F, respectively. The cathodic disbondment test (CD-Test) showed that the disbondment radius of the coating under the influence of the cathodic protection current was 4.32mm. Mechanical analysis by pull-off adhesion test showed a value of 7.28 MPa after the addition of 2MI 2 %wt but decreased to 6.63 MPa at 3 %wt. Therefore, the optimum addition is 1 %wt 2MI for low-temperature applications of 170 –175°C in piles with high coating performance and compliance with predetermined standards. BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/267 10.55981/jsmi.2023.267 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 7-19 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/267/1230 Copyright (c) 2023 Rinush Fedrikdo Paltgor, Rini Riastuti, Rizal Tresna Ramdhani, Muhammad Yunus https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/271 2026-11-02T08:34:09Z jsmi:ART

Preparation of Polyurethane-Modified Epoxy Coating Materials Based on Vegetable Oil Derivated Ester Ghozali, Muhammad Restu, Witta Kartika Triwulandari, Evi Fauzi, Lutfi Rizky Polyurethane Polymer coatings Epoxy Vegetable oil This study utilize vegetable oil derivatives as a polyol in polyurethane. A modification of epoxy using polyurethane was done using ester derivative of vegetable oils as polyols, which was polyethylene glycol monooleate (PEGMO). The PEGMO was synthesized via an esterification reaction. The synthesis of polyurethane-modified epoxy using polyethylene glycol monooleate ester (PME-PEGMO) was conducted by reacting epoxy, tolonate and PEGMO. Analysis results of FTIR and H-NMR showed a new absorption peak derived from the urethane bond. The mechanical and thermal properties were characterized by a universal testing machine (UTM) and thermogravimetry analysis (TGA), respectively. According to the analysis results, it is shown that the addition of polyethylene glycol monooleate ester-based polyurethane on epoxy improved the mechanical properties of the epoxy, from 69.61 kgf/cm2 to139.80 kgf/cm2. However, it decreased the thermal stability of the epoxy. At 500°C, the mass of epoxy was remaining 28%, while the PME-PEGMO was only 13%.   BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/271 10.55981/jsmi.2023.271 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 21-28 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/271/577 Copyright (c) 2023 Muhammad Ghozali, Witta Kartika Restu, Evi Triwulandari, Lutfi Rizky Fauzi https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/277 2026-11-02T08:34:09Z jsmi:ART

Characterization of Glass Fiber / Epoxy with Various Silicone Resin Addition Composite’s Compressive and Flexural Strength Muhamad Hananuputra Setianto Herry Purnomo Mochamad Chalid Composite Glass Fiber Epoxy Silicone resin compressive Flexural Glass fiber/epoxy composite was developed and used widely in manyapplications. Development on fiber and matrix of composite material was done to improve itsproperties. Improvement of the composite’s matrix can be done/by adding a modifier. Silicone resinis one kind of modifier that can be added to epoxy to improve its properties. Silicone resin willimprove the thermal stability of epoxy, but the effect on mechanical properties, especially whencombined with glass fiber, has not been done. In this study, a composite of glass fiber/epoxy with 0,10, 20, and 30 weight-% silicone resin addition was tested by compressive and flexural loadingmethods. Compressive strength and maximum strain tend to decrease with the increase of siliconeresin added. The highest compressive strength and strain were reached by a glass fiber and epoxycomposite without any modification at the value 240.63 MPa and 0.5%. Flexural strength willdecrease, but maximum strain will increase when more silicone resin is added to the matrix on theflexural test. The biggest flexural strength at 293.73 MPa was possessed by the composite withoutfurther modification, and a maximum strain of 5% was owned by the composite with 20% and 30%silicone resin addition. BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/277 10.55981/jsmi.2023.277 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 29-35 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/277/1227 Copyright (c) 2023 Muhamad Hananuputra Setianto, Mochamad Chalid, Herry Purnomo https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/686 2026-11-02T08:34:09Z jsmi:ART

Porous Carbon Black Microsphere from Palm Oil Black Liquor Jayadi, Jayadi Maddu, Akhiruddin Sari, Yessie Widayatno, Wahyu Bambang Wismogroho, Agus Sukarto Firdarini, Cherly Mulya, Marga Asta Jaya Spray Pyrolysis Black Liquor Carbon Black microspheres The aim of this research is to synthesize porous carbon black microspheres from palm oil black liquor through an in-house spray pyrolysis system. The in-house spray pyrolysis (SP) system was developed using a horizontal furnace. To test the developed SP equipment, the temperature profiles within the developed spray pyrolysis chamber were examined at 3 different setting temperatures (800, 900, and 1000 °C). These temperatures were also applied for synthesizing the carbon black microspheres, with and without nitrogen as carrier gas. The morphology of carbon black produced by using SP equipment was tested by a 3D Optical Microscope and FE-SEM. The optimum temperature obtained in this study is 1000 ºC according to the characterization of carbon black microspheres produced. The FE-SEM analysis indicated the presence of spherical carbon having microstructures. This indicates that the in-house spray pyrolysis machine has been successfully developed for synthesizing carbon black microspheres. BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/686 10.55981/jsmi.2023.686 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 37-46 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/686/1235 Copyright (c) 2023 Jayadi Jayadi, Akhiruddin Maddu, Yessie Sari, Wahyu Bambang Widayatno, Agus Sukarto Wismogroho, Cherly Firdarini, Marga Asta Jaya Mulya https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/704 2026-11-02T08:34:09Z jsmi:ART

Synthesis and Characterization of a Polystyrene-based Scintillator for Gamma Detection Pancoko, Marliyadi Hafni Lissa Nuri Manaf, Azwar Dimyati, Arbi Jami, Abdul Polystyrene Scintillator Gamma detection RPM This study aimed to create and examine plastic scintillators made from a polystyrene matrix, which are widely used in radiation detection due to their favorable properties such as rapid decay time, low cost, resistance to moisture, and ease of fabrication. The scintillators were doped with p-terphenyl (PTP) and 1,4-bis[2-(phenyloxazolyl)]-benzene (POPOP) using an injection method with an extruder machine. The materials were then characterized using various techniques. Fourier Transform Infrared Spectroscopy (FTIR) revealed the presence of aromatic chains which are essential for the scintillation process. Differential Scanning Calorimetry (DSC) analysis showed stable thermal properties with a glass transition temperature of approximately 100ºC. Scanning Electron Microscopy (SEM) showed that the surface of the polymer is amorphous with small bumps and protrusions likely caused by the PTP and POPOP dopants. The optical evaluation indicated that the sample could absorb UV photons up to 340 nm and emit photons in the wavelength range of 400-500 nm with a peak at 421 nm. Gamma spectra analysis indicated that the plastic scintillators performed well in gamma detection and could be used in a Radiation Portal Monitor (RPM). BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/704 10.55981/jsmi.2023.704 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 47-54 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/704/1232 Copyright (c) 2023 Marliyadi Pancoko, Hafni Lissa Nuri, Azwar Manaf, Arbi Dimyati, Abdul Jami https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/707 2026-11-02T08:34:09Z jsmi:ART

Post-Consumer Recycling of Polymers for Sustainable 3D Printing Filament Material Mawaddah, Siti Mutia Chalid, Mochamad Maulidina, Sandrina Aras Ashanti, Cut Kayla Nugraha, Adam Febriyanto 3D printing filament Post-consumer recycling Polymer recycling 3D printing technology is rapidly developing in the manufacturing industry in producing complex and easily adjustable three-dimensional objects using the help of controls from computers. Behind its advantages, the 3D printing process requires filaments from virgin polymers which generally have a high price and adversely affect the environment. Post-consumer polymer recycling is a substitute material solution from virgin polymers and is environmentally friendly so as to support the realization of a circular economy. Studies on 3D printing filaments from post-consumer polymers have been discussed in this article, especially for filaments derived from acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), and polyethylene terephthalate (PET). In addition, this article also reviews the sources of recycled raw materials, difficulties during the process, mechanical properties, thermal properties and efforts to improve the quality of 3D printing products. The results show that recycling post-consumer polymers for 3D printing filament applications is a promising approach to reducing the environmental impact of 3D printing while still retaining the mechanical properties and printability of filaments. This article provides insight into several studies that address the development of 3D printing using post-consumer polymer materials. BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/707 10.55981/jsmi.2023.707 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; 55-66 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/707/1231 Copyright (c) 2023 Siti Mutia Mawaddah, Mochamad Chalid, Sandrina Aras Maulidina, Cut Kayla Ashanti, Adam Febriyanto Nugraha https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/757 2026-11-02T08:33:18Z jsmi:ART

Effect of Ammonia on the Synthesis of NMC541 Cathode Materials with the Sol-Gel Method Purwamargapratala, Yustinus Safitri, Jihan Fakhriyah Nursanto, Eduardus Budi Jodi, Heri Kartini, Evvy Zulfia, Anne NMC541 Sol-gel Ammonia Conductivity The research studied about the effect of ammonia on the synthesis of lithium-ion battery cathode materials LiNi0.5Mn0.4Co0.1O2 (NMC541) through a sol-gel method by modifying the mole ratio of ammonia to metal forming ratios (0.5; 1.0; 1.5; and 2.0). The precipitation formed at pH 11 and at temperature of 80oC. Characterization was carried out on samples resulting from pyrolysis (pyrolysis result), with calcination for once and twice at 850oC for 3 hours, X-ray diffraction pattern characterization, morphological characterization using scanning electron microscope (SEM), and conductivity characterization using an impedance capacitance conductance (LCR) meter. The result of the synthesis is in the form of spherical particles. The addition of ammonia affected the particle size distribution and stoichiometry of the metal forming NMC541, eventhough it was not significant. The ammonia to metal ratio of 1.5 (Sample N1.5-K) resulted in the distribution with the optimum particle homogeneity. The morphology of the pyrolysis and 3 hours-850oC calcined samples was dominated by spherical particles and agglomeration. Particle growth in the material is affected by heat treatment time. Samples with ammonia to metal ratio of 2.0 (N2.0-K) have the closest stoichiometry to NMC541. The total conductivity of the sample at a measurement frequency of 42Hz-1MHz is in the value range of 10-7–10-5 S.cm-1. The particle size is also affected by the calcination temperature. The effect of using ammonia in the synthesis process is not directly related to the electrical properties. However, it is related to the purity of NMC541. Samples of N1.5-K pyrolyzed result and samples of N1.0-K (3 hour 850 oC calcined) have optimum conductivity values. Agglomeration as a calcination effect lowers the conductivity value. The addition of 3 hours of calcination time does not significantly increase the conductivity value BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/757 10.55981/jsmi.2023.757 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 59-66 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/757/461 Copyright (c) 2023 Yustinus Purwamargapratala, Jihan Fakhriyah Safitri, Eduardus Budi Nursanto, Heri Jodi, Evvy Kartini, Anne Zulfia https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/758 2026-11-02T08:33:18Z jsmi:ART

Effect of Cold Rolling and Flash Annealing on Microstructure and Mechanical Behaviour of Austenitic Manganese Steel (Fe-1.15C-13Mn) Al Hakam, Abdul Hanin Ridlo, Faried Miftahur Tanjung, Rifqi Aulia Damar, Lia Amalia Paristiawan, Permana Andi Austenitic manganese steel Solution treatment Cold rolling Flash annealing Deformation twin Austenitic manganese steel (AMS) is widely used in the mineral and mining industry under high workload condition due to its remarkable work-hardening capacity under impact. However, AMS typically has an austenitic matrix with carbides precipitated resulting in low hardness and brittle properties, which impaired its wear performance. In this study, cold deformation followed by flash annealing were conducted to improve the mechanical behavior of AMS. The experimental was carried out by solution treatment (ST), cold rolling (CR) with deformation degrees of 10% and 20%, and flash annealing (FA) at 915°C with holding times of 90 and 150 seconds. The microstructure evolution and mechanical behavior were studied. The ST produced a completely austenitic microstructure which was free of carbide, resulting in a decrease in strength and hardness, as well as improved ductility. After cold deformation, both of strength and hardness were substantially improved, followed by loss in ductility. Optical microstructures reveal the formation of deformation twin (DT) and annealing twin (AT) after cold deformed. Higher intensity of DT results in AMS with considerable strength and hardness but decrease in ductility. After FA process, cold deformed structures undergo microstructural restoration, which manifests by recovery stage at 90 s and recrystallisation stage at 150 s annealing time. At the same FA time, higher degree of deformation led to increase the hardness, while at the same degree of strain, longer annealing time led to a decrease of hardness. Moreover, both of higher degree of strain and longer annealing time during flash annealing were contributed to grain refinement, even though did not affected to the increase of tensile and hardness. In addition, 20% cold rolling followed by 150 s annealing time (CR20FA150) could be considered as an effective method to obtain the most optimum combination of strength and ductility with finer grain. BRIN Publishing (Penerbit BRIN) 2023-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/758 10.55981/jsmi.2023.758 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 67-74 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/758/467 Copyright (c) 2023 Faried Miftahur Ridlo https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/759 2026-11-02T08:33:18Z jsmi:ART

Investigation On Oxidation Behavior of Nuclear Graphite IG-110 At Elevated Temperature Herlina Rivai, Abu Khalid Rivai, Sigit Khalid Nuclear Oxidation Microstructure Graphite IG-110 IG-110 is one of nuclear graphite types for high temperature gas cooled reactor. One of the issues of the graphite in the reactor system is the interaction with air or/and water which can reduce the integrity of the material. In this study, the sample of IG-110 has been tested at high temperature in an air environment. The oxidation test was done using a magnetic suspension balance to analyze the changes in weight with direct monitoring. The test was carried out at a temperature of 630°C. Morphological and microstructural analysis were observed and tested using scanning electron microscope (SEM) and X-ray diffractometer (XRD). The oxidation rate of the sample was relatively low. Rougher sheets shape, larger pores, and slight cracks were observed for the tested sample which indicate the traces of oxidation of the samples with no any critical damage occurred in the sample. Lattice parameters, density, crystal size, and d-space of the sample after oxidation test slightly change, which show the reversible characteristic of the sample from the temperature viewpoint. BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/759 10.55981/jsmi.2023.759 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 75-80 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/759/462 Copyright (c) 2023 Herlina Herlina, Abu Khalid Rivai, Sigit Khalid Rivai https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/760 2026-11-02T08:33:18Z jsmi:ART

Electrodeposition of Zn Zn-doped Cu Cu2O in Acidic and Alkaline Solution and Its Catalytic Activity for Ethanol Electrooxidation Budi, Setia Syafei, Devi Indrawati electrodeposition ethanol electrooxidation photocatalyst Zn-doped Cu2O In this study, Zn-doped Cu2O films were synthesized by electrodeposition technique in acidic (pH 4) and alkaline (pH 10) solution. Catalytic activity of the film was evaluated toward ethanol electrooxidation which was carried out using cyclic voltammetry technique. X-ray diffraction (XRD) analysis showed the formation of cubic structure of Cu2O from both conditions. Morphological characterization conducted under a field-emission scanning electron microscope exhibited that Cu2O particles electrodeposited in the acidic condition were smaller compared to those obtained in the alkaline condition. The photoelectrochemical responses, which were recorded using a linear sweep voltammetry technique, showed that the highest photocurrent density was 31.5 mA.cm-2 that obtained at 0.76 V vs. Ag/AgCl using Zn-doped Cu2O film prepared in the acidic condition. The film also possesses a low resistance charge transfer as measured by the electrochemical impedance spectroscopy (EIS) technique. These electrochemical characteristics resulted in a high catalytic performance of the Zn-doped Cu2O film on the ethanol electrooxidation as shown by the high anodic current of 22 mA.cm-2 at 0.968 V. These results indicated that the Zn-doped Cu2O film electrodeposited in the acidic condition has a good catalytic activity towards ethanol electrooxidation process. BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/760 10.55981/jsmi.2023.760 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 81-88 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/760/463 Copyright (c) 2023 Setia Budi https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/761 2026-11-02T08:33:18Z jsmi:ART

Geometry Design-Based Thermoelectric Optimization Module Prananca, Aristu Fatimah, Iim ANSYS Finite Element Analysis Power Output Thermoelectric One alternative energy source is thermoelectric which is able to convert waste heat into electricity. However, research on thermoelectrics still needs a lot of development, especially module design. Therefore, research on thermoelectric optimization based on the module design was carried out using computer simulation. One of the parameters that can be used for analysis is the maximum output power which is thought to be increased through the cross-sectional area, length, shape, and type of pairs of legs. The principles used in the simulation are about the semiconductor material which is a type of thermoelectric foot material, the Seebeck effect to understand the energy conversion process, resistivity and thermal conductivity to understand the input from the simulation, CaTiO3, and SiC to understand the material used for the model and also Finite Element Analysis. FEA) and output power to understand the processing of simulation results. The research begins by making a design for each variation, entering the specifications, then the running process and calculations to obtain the maximum output power. From the simulation results, it is known that the thermoelectric design will be optimal for small leg lengths, large cross-sectional areas, and using similar materials (Unileg) with good specifications with a maximum output power value of 3,713.10-8 W for beams, 3,634.10-8 W for cylinders, and 8,617.10-8 W For Unileg N-N. BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/761 10.55981/jsmi.2023.761 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 89-96 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/761/464 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/762 2026-11-02T08:33:18Z jsmi:ART

Electrochemically Synthesized Gold Nanoparticles Using Gold and Copper Electrodes Lewa, Ismira Wahyu Lestari Meifina Isnaeni Gold nanoparticles Electrochemical Absorbance Simulation Coper Gold nanoparticle is one of the interesting metallic nanoparticles that can be applied to various applications due to promising plasmon effect. Gold nanoparticles are usually synthesized from gold salts using chemical procedure to precisely control of their sizes and shapes. However, gold salt is expensive and the synthesis requirement and procedure are complicated. It is a challenge to produce gold nanoparticles using cheap, rapid, simple and massive method. Electrochemical is one of the simple procedures to synthesize gold nanoparticles; however, the utilization of platinum electrode, which is expensive, become disadvantage. In this work, we utilized copper plate to replace platinum electrode in order to synthesize gold nanoparticles. We also varied electrolyte, stabilizer, ambient temperature and injection current to study their effects on absorbance spectra of synthesized gold nanoparticles. We found that ambient temperature and injection current significantly affected shape of gold nanoparticles. Surprisingly, combination of salt-glucose or stabilizer-glucose was enough to synthesize gold nanoparticles. This work brings a simple and cheap technique for massive production of gold nanoparticles for various applications BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/762 10.55981/jsmi.2023.762 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 97-104 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/762/465 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/763 2026-11-02T08:33:18Z jsmi:ART

Blending Process of Cellulose Nanofiber /Polyvin y l Alco hol (NFC/PVA) For Paper Coating Application Ni Made Sudri Handayani, Aniek Sri Ratnawati Septevani, Athanasia Amanda Puspita, Mutiara Eka Husnil, Yuli Amalia Arifin, Yalun Syabila, Annisa Nurul Zul Qois, Muhamad Rofi Experimental design Viscosity Density Efficiency Taguchi method This paper describes how to make films using polyvinyl alcohol (PVA) and nanofiber cellulose (NFC). In this study, different NFC and PVA ratios were varied. To achieve ideal condition during the film making process, several characteristics, including as density and viscosity, have been investigated using Taguchi method. The results showed two main outcomes. To obtain optimal viscosity, the NFC/PVA ratio factor is 5/95, the volume/volume ratio is 10%, and the sonication time is 7 minutes. For optimal density, several conditions can be used, including a NFC/PVA ratio of 10/90, volume/volume ratio of 3%, and a sonication time of 5 minutes. The experimental results confirmed the average viscosity response of 129.99 ± 13.33 and the S/N ratio of -42.64 ± 0.56. The experimental results of the Taguchi method were -42.64 ± 0.56 and the S/N ratio was -42.92 ± 0.67. Meanwhile, the response data for the Taguchi methodal density averaged at 1.042 ± 0.013 and the S/N ratio was -0.365 ± 0.104. For the results of the experimental condition were 1.126 ± 0.015 and the S/N ratio of -1.031 ± 0.124.From these data, it can be concluded that there is an increase in the average and variability which indicates that the blending process is getting better with the use of NFC. BRIN Publishing (Penerbit BRIN) 2023-05-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/763 10.55981/jsmi.2023.763 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; 105-116 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/763/466 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/773 2026-11-02T08:33:18Z jsmi:Ed

Front Matter (Editorial Team, Preface and Table of Contents) JSMI, Editor - BRIN Publishing (Penerbit BRIN) 2023-05-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/773 Jurnal Sains Materi Indonesia; Vol. 24 No. 2 (2023): Jurnal Sains dan Materi Indonesia; i-iv 2614-087X 1411-1098 10.55981/jsmi.v24i2 eng https://ejournal.brin.go.id/jsmi/article/view/773/468 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/893 2024-07-18T07:32:37Z jsmi:ART

Effect of Precursor Solvent on the Carbon Micro-Structures Derived from Spray Pyrolysis of Pine Resin (Gondorukem): Preliminary Study Jayadi Widayatno, Wahyu Bambang Wismogroho, Agus Sukarto Firdharini, Cherly Maddu, Akhiruddin Alatas, Husin Sari, Yessie Widya Carbon Microstructures Microstructures Pine resin (gondorukem) Spray Pyrolysis Carbon materials have been widely used in various fields. This study aimed to produce carbon using spray pyrolysis with pine resin (gondorukem) as the precursor and different solvents, namely gondorukem-acetone (GAC), gondorukem-ethyl acetate (GEA), and gondorukem-dichloromethane (GDC). The precursor was prepared in a 1:8 (m/v) ratio, and the spray pyrolysis method was employed by heating the atomized precursor solution in the heating zone of a tube furnace. The atomization precursor was infused with nitrogen gas at a rate of 1 l/min with furnace temperature set at 1000°C with heating times of 5, 10, and 20 mins. The carbonaceous materials produced from the pyrolysis were collected on the wire mesh 1000 that was put on a stainless pipe. Carbon that has been coated on the wire mesh 1000 was analyzed using the optical microscope (OM). The physical properties and morphology of the synthesized carbonaceous material were analyzed using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), Raman, and Brunaur-Emmett-Teller (BET). Based on FE-SEM analysis, the particle size of the GAC sample has an average of 283.58 nm and the highest carbon content, which reached an average of 97.312 At%. GAC samples had the lowest disorder properties in the Raman spectroscopy test, with the value of ID/IG reaching 0.795764. The functional groups observed were C–H stretching at 2920.49 cm-1, N–H bending at 1629.07 cm-1, and C–O stretching at 1159.70 cm-1. Based on carbon content, disorder properties, and functional group stabilization, carbon from the GAC precursor provides the ideal characteristics to be used as a filter material in medical masks. Meanwhile, based on BET testing, the carbon materials from GEA have the ideal material morphological properties to be used as a filter in medical masks. Spray pyrolysis is an efficient method for producing carbon materials, and the use of gondorukem as the precursor shows great potential for various applications. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/893 10.55981/jsmi.2024.893 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 67-76 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/893/3669 Copyright (c) 2024 Jayadi, Wahyu Bambang Widayatno, Agus Sukarto Wismogroho, Cherly Firdharini, Akhiruddin Maddu, Husin Alatas, Yessie Widya Sari https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/924 2024-07-18T07:32:37Z jsmi:ART

Adsorption Study of Methylene Blue and Methyl Red on Activated Carbon from Silver Composite Using the Extract of Spent Coffee Grounds Haidar Sitie Rafidah Prasetia, Hafiizh Saefumillah, Asep Activated Carbon Silver Composite Spent Coffee Grounds Methylene Blue Methyl Red The activated carbon was prepared from silver composite via an extract of spent coffee grounds with phosphoric acid activation. The activated carbon was used to study the removal of methylene blue and methyl red from an aqueous medium. Fourier-transform infrared spectroscopy (FTIR) spectra confirmed the functional group of O–P–O that can interact with dye molecules and the reduction process of Ag+ to Ag0. Field Emission Scanning Electron Microscopy (FESEM) morphology suggests a porous and irregular polygonal shape. The efficiency removal and adsorption capacity of methylene blue reached 98.73% and 9.87 mg/g at pH 9, while methyl red reached 98.55% and 9.86 mg/g at pH 4. The kinetics adsorption study followed the pseudo-first order. The isotherm adsorption study followed the Langmuir model. Based on the kinetics and isotherm study, the adsorption study of methylene blue and methyl red is chemical sorption. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/924 10.55981/jsmi.2024.924 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 77-84 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/924/1716 Copyright (c) 2024 Haidar Sitie Rafidah, Hafiizh Prasetia, Asep Saefumillah https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/1076 2024-07-18T07:32:37Z jsmi:ART

A Review on Development of Porous Aluminosilicate-Based Zeolite Adsorbent for Heavy Metal Pollution Treatment Hakim, Muh. Supwatul Iqbal, Rendy Muhamad 'Adany, Fildzah Putra, Riandy Nitriany, Ici Telaumbanua, Idam Sulastri Sitorus, Raya Uli Dewi, Rey Kamala Zeolite Adsorbent Wastewater Heavy Metals Environmental Heavy metal contamination endangers human health and has been identified as a global issue. The rising concentration of heavy metals in industrial and domestic wastewater has prompted the quest for effective technologies and treatments to remove them. Zeolite is a promising material for eliminating heavy metals from diverse sources that pollute wastewater. Zeolite is a crystal comprised of hydrated aluminosilicates of alkali and alkaline earth metals in a threedimensional crystal network composed of easily controllable SiO4 4− and AlO4 5− . This review focuses on the critical analysis of the application of several zeolites for the adsorption of heavy metals from wastewater, namely Cd(II), As(III and V), Cr(III and VI), Cu(II), Pb(II), Ni(II), Mn(II), and Hg(II). The results of heavy metal removal reported by zeolites are summarized, and the chemical modification of zeolites with acid/base/salt reagents, surfactants, and metal reagents has been investigated, compared, and discussed. The adsorption/desorption capabilities, systems, operational parameters, isotherms, and kinetics of zeolites are then explained and compared. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/1076 10.55981/jsmi.2024.1076 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 85-99 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/1076/2720 Copyright (c) 2024 Muh. Supwatul Hakim, Rendy Muhamad Iqbal, Fildzah 'Adany, Riandy Putra, Ici Nitriany, Idam Sulastri Telaumbanua, Raya Uli Sitorus, Rey Kamala Dewi https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/1260 2024-07-18T07:32:37Z jsmi:ART

Utilization of Potassium Carbonate-Ethylene Glycol as Deep Eutectic Solvent to Delignification Oil Palm Empty Fruit Bunch for Furfural and Ethanol Production Muryanto Amelia, Fanny Nurbayti, Siti Sudiyani, Yanni Gozan, Misri deep eutectic solvent ethylene gycol furfural sugar bioethanol Lignocellulosic Pretreatment using Deep Eutectic Solvent (DES) was done to reduce the lignin content in oil palm empty fruit bunch (OPEFB). DES solution was prepared by combining Potassium Carbonate (K2CO3) as hydrogen bond acceptors (HBA) and Ethylene Glycol (EG) as hydrogen bond donors (HBD). This study aimed to obtain optimum conditions in the pretreatment process and determine the levels of lignin, cellulose, hemicellulose, and glucose in OPEFB. The pretreatment stage was performed at different temperature parameters, 100, 120, and 150°C, for 60 minutes to produce optimum conditions. Biomass pretreated with DES was hydrolyzed by cellulase complex to obtain glycose and xylose. The results showed that the pretreatment optimum condition value achieved with DES K2CO3:EG (1:10) at 150°C for 60 minutes was able to degrade lignin by 46,06%, hemicellulose by 4,08%, increase cellulose by 60,21%. The glucose and xylose content reached 58.48 g/l and 26.60 g/l, respectively. This sugar has potential for ethanol production from glucose and furfural production from xylose. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/1260 10.55981/jsmi.2024.1260 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 100-106 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/1260/2718 Copyright (c) 2024 muryanto muryanto, Fanny Amelia, Siti Nurbayti, Yanni Sudiyani, Misri Gozan https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/2045 2026-10-30T04:25:58Z jsmi:ART

THE KINETICS OF PRECIPITATE COARSENING IN ZIRCALOY-2 Harini Sungkono Sungkono Zircaloy-2 Kinetics of precipitate coarsening Fuel element cladding Zircaloy-2 has been used as fuel element cladding material in both light and heavy water power reactors. The aims of the experiment are to study the kinetics of precipitate coarsening during isothermal a-annealing and to characterize the nucleation and growth of precipitate affected by the variations of cold work and heat treatment. The results of the experiment show that all specimens annealed at 650°C have the average precipitate diameter less than 0.1 um whereas those at 750°C have the average size larger than 0.1 .tm except for one annealed for less than 5 hours. The average size of precipitates is 0.07 um for specimens deformed before 0-quenching and 0.168 .tm for specimens deformed after 0-quenching. The deformed specimens after 13-quenching have more homogeneous size distribution than that of undeformed specimens and specimens deformed before 0-quenching. The kinetics of precipitate coarsening depends on the changes in annealing temperature and time, and cooling rate from the 0-phase region. The nucleation and growth of precipitates have been influenced by the variations of cold work and heat treatment. BRIN Publishing (Penerbit BRIN) 2000-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/2045 10.17146/jusami.2000.1.2.5320 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 1-4 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/2045/1239 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/2051 2025-03-27T16:53:53Z jsmi:ART

Influence of Hydrothermal Temperature on the Physical Characteristics and Photocatalytics Activity of TiO2 for Degradation of Amoxicillin Sutisna, Sutisna Maulana, Rija Rizqi Maulina, Wenny Sujito, Sujito Berlianti, Nindha Ayu Wibowo, Edy TiO2 Photocatalytic activity Hydrothermal Hydrothermal temperature Titanium dioxide (TiO2) is a photocatalyst material widely used for environmental remediation applications. In this research, TiO2 material was synthesized using the hydrothermal method at various temperatures (150°C, 180°C, and 200°C). Based on the Fourier-transform infrared (FTIR) data, it was found that all the synthesized materials showed similar absorption peaks, and Ti-O-Ti bonds were detected, which is a characteristic of TiO2. X-ray diffraction (XRD) analysis showed that all the synthesized materials were TiO2 anatase with different crystalline sizes. The synthesized TiO2 using the hydrothermal temperature of 180°C showed the smallest crystalline size of 86.81 nm. Based on the analysis of the band gap energy, it was found that wider band gap energy was obtained at higher hydrothermal temperatures. The band gap energies of the synthesized materials are 3.18 eV, 3.19 eV, and 3.21 eV for hydrothermal temperatures of 150°C, 180°C, and 200°C, respectively. The photocatalytic activity of the three synthesized materials was tested in the photodegradation experiment of amoxicillin under ultraviolet (UV) irradiation. As a result, it was found that TiO2 synthesized at 180°C has the highest photocatalytic activity by degrading 100% of amoxicillin compounds within 120 minutes. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/2051 10.55981/jsmi.2024.2051 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 1-10 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/2051/4246 Copyright (c) 2024 Sutisna Sutisna, Rija Rizqi Maulana, Wenny Maulina, Sujito Sujito, Nindha Ayu Berlianti, Edy Wibowo https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/2370 2026-11-02T08:34:09Z jsmi:Ed

Front Matter (Editorial Team, Preface and Table of Contents) Jurnal, Editor BRIN Publishing (Penerbit BRIN) 2023-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/2370 Jurnal Sains Materi Indonesia; Vol. 25 No. 1 (2023): Jurnal Sains dan Materi Indonesia; i-iv 2614-087X 1411-1098 10.55981/jsmi.v25i1 eng https://ejournal.brin.go.id/jsmi/article/view/2370/1476 Copyright (c) 2023 Jurnal Sains Materi Indonesia https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/2552 2024-07-18T07:32:37Z jsmi:ART

Nitrogen-doped Carbon Dots Derived from Green Algae and Ammonia as Photocatalyst Material Erna Hastuti Mutiara Kurniati Hikmah Green algae Carbon dots Hydrothermal Photocatalyst nitrogen Carbon dots are a novel carbon-based material with the appealing properties of inexpensive nanomaterials, low toxicity, environmental tolerance, abundance, photostability, and simplicity of synthesis. Carbon dots (CDs) have effectively distinguished themselves from other materials due to their superior properties, such as ultra-small size, good photostability, excellent biocompatibility, and tunable fluorescence properties. This study synthesized carbon dots from green algae using a hydrothermal method at 180 °C and doped with nitrogen. Green algae contain carbohydrates, proteins, and poly-unsaturated fatty acids, allowing them to produce more carbon and be used as a precursor in synthesizing carbon dots. The FT-IR and UV-Vis spectra reveal the distinct functionalization and energy gap between the surface states of CDs and N-CDs. The carbon nanoparticles were then used as photocatalysts to degrade methyl red. The results indicate that nitrogen doping is superior for reducing methyl red and has tremendous potential for environmental applications. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/2552 10.55981/jsmi.2024.2552 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 115-121 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/2552/3671 Copyright (c) 2024 Erna Hastuti, Z. Mutiara, T. Kurniati, U. Hikmah https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3117 2024-07-18T07:32:37Z jsmi:ART

Hydrolysate as an alternative feedstock for furfural production Utami, Syelvia Putri Rezki, Yoanni Marsha Ermalinda, Vina Komalasari Aziz, Yelmida Furfural Diluted acid Hydrochloric acid Hydrolysate Furfural has emerged as a value-added chemical product which generated from hemicellulose-base biomass, in the context of hardwood it called as biorefining. Several methods have been developed to produce furfural using both hydrothermal and catalytic processes. In this study, hydrolysate is used as feedstock for generating furfural by using diluted sulfuric acid and aluminium chloride.  Temperature and reaction time has been considered as the valuable variable. Hydrolysate was charged with the acid-catalyst for around 90 min at certain temperature. The product analyzed by using fourier transform index refractory and excess bromine method.  At this time, the highest yield of furfural for non-catalyst process was achieved at 120 oC for 90 min. Diluted acid solution  by hydrochloric acid  and AlCl3 1% managed to increase furfural production from hydrolysate in the mild temperature. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3117 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 132-139 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/3117/3673 Copyright (c) 2024 Syelvia Putri Utami, Yoanni Marsha Rezki, Vina Ermalinda, Komalasari, Yelmida Aziz https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3120 2024-07-18T07:32:37Z jsmi:ART

Aluminum Waste as Electrode for Home Textile Industry Wastewater Treatment using Batch Electrocoagulation Process: Studies on Operating Parameters Irawan, Chairul Mu'minah, Ridhayanti Purnawilda, Agita Fatyasari Nata, Iryanti Electrocoagulation Sasirangan textile wastewater Color COD Aluminum electrode wastewater The manufacture of the Sasirangan home textile industry involves coloring and dyeing processes using synthetic dyes in large quantities. These contaminants of dyes and organic materials would cause high color and chemical oxygen demand (COD) contaminants values. This study aims to characterize the wastewater of batik-modified Sasirangan and determine the effect of current density and length of operating time on color removal and reduction of COD in Sasirangan home textile industry wastewater through the batch electrocoagulation process. The method used in this research is an electric current flowing in the same direction to the Sasirangan home textile industry wastewater in a reactor with dimensions of 310  180  240 mm3. The electrode used is aluminum alloy type 1100. The aluminum/aluminum (Al/Al) electrode is used in this electrocoagulation (EC) process, then connected to a direct current (DC) power supply. The experiment was carried out at room temperature using an electrode distance of 2 cm with variations in the time of the electrocoagulation process for 15–120 minutes. The experiment was repeated for variations in pH (4–9) with a current density of 3.5–5.5 mA/cm2. Furthermore, an analysis of the color removal and the decrease in the concentration of COD was carried out. The results showed that the contaminant content in Sasirangan home textile industry wastewater decreased significantly, whereas the optimal conditions for the EC reaction were determined using color and COD removal efficiency parameters. The decrease in color and COD concentrations occurred at a current density of 5.5 mA/cm2 with a pH of 4 for 120 minutes, around 1110 PtCo and 90.4 mg/L of COD, respectively BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3120 10.55981/jsmi.2024.3120 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 107-114 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/3120/3670 Copyright (c) 2024 Chairul Irawan, Ridhayanti Mu'minah, Agita Purnawilda, Iryanti Fatyasari Nata https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3121 2024-07-18T07:32:37Z jsmi:ART

Formulation and Characterization of Dewandaru Fruit Extract in Nanocarrier System Septiyanti, Melati Nurfauziyah Angelina, Marissa Triana Dewi, Rizna Fajriah, Sofa Meliana, Yenny Dewandaru Homogenizer Milling Nanoemulsion Nanoencapsulation Dewandaru (Eugenia uniflora L.) is a herbaceous plant that grows in tropical and subtropical regions. The fruit extract can prevent oxidative damage and cholinergic changes. It contributes to antihyperglycemic, antihyperlipidemic, and neuroprotective due to its antioxidants and antidepressant effect. It also possesses antibacterial and anti-inflammatory activity and potentially prevents cardiovascular disease and cancer. In this study, dewandaru fruit extract was formulated in the nanocarrier system (nanoemulsion and nanoencapsulation) to preserve product stability and improve product dispersibility and bioavailability. The nanoemulsion optimum formulation condition was obtained on dewandaru fruit extract concentration 10 wt%, oil/surfactant ratio 0.25, and homogenization speed 20.000 rpm, resulting in particle size of 46.4 ± 0.4 nm and polydispersity index 0.480 ± 0.015. The optimum nanoemulsion formulation was further processed to nanoencapsulation along with milling to produce finer particles. The nanoencapsulation milled for 120 minutes produced encapsulation powder with a size of 5.8 ± 3.340 μm. Accordingly, the nanocarrier technology for dewandaru fruit extract promoted a versatile medicinal preparation both in liquid and solid form. However, the size reduction by milling might disrupt the efficiency of the encapsulation release system. Without the proper coating, as orally administrated, the compound rapidly dissolved before it reached the targeted site. BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3121 10.55981/jsmi.2024.3121 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 122-131 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/3121/3672 Copyright (c) 2024 Melati Septiyanti, Nurfauziyah, Marissa Angelina, Rizna Triana Dewi, Sofa Fajriah, Yenny Meliana https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3130 2025-03-27T16:53:53Z jsmi:ART

Corrosion Resistant Support Materials (CRSM) as Potential Development of Technical Parameters for Biocompatibility Testing of Bone Implant Products: A Review Purwanto, Endi Hari Lukiawan, Reza Louhenapessy, Bendjamin Benny Basuki, Budhy Anggraeni, Putty Darmayanti, Nur Tjahyo Eka Anticorrosive material Anticorrosive method Biocompatible Bone implant Technical parameters This study aims to describe the risk of bone implant material 316L-SS by identifying the material or materials or methods that are able to withstand the rate of corrosion or anti-corrosion. The method used is a literature study supported by tabulation data processing instruments, mind mapping, and fishbone diagrams. All journal literature is collected, grouped, carefully identified and scored to obtain information regarding its anti-corrosive material. The results show that corrosion of 316L can be coated with an anti-corrosive support material  as follows: 1) Alumina Sol-Gel, 2) Silane, 3) Parylene, 4) Niobium Oxide (Nb2O5), 5) 0.01%SS, 6) MgO/Tb,Eu-HAP, 7) Ti6Al4V coated HAP 40 micrometers, 8) HAP+HNO3, 9) Nano-HA, 10) Samarium- Gadolinium-HAP (Sm/Gd-HAP), 11) Nano-Thin Film Hydroxyapatite polylactic acid (nHA-PLA), 12) Multiwall Carbon Nanotube, 13) f-MWCNT, 14) Ag-HA/f-MWCNT nanocomposite, 15) nano HAP, 16) nano TiO2, 17) Double-HA, 18 ) Titanium ions, 19) Superhydrophilic TNT, 20) Superhydrophobic TNT, and 21) Ti-Nb-Zr-Ta6. Each element that coats 316L-SS has different characteristics of advantages, but unfortunately all existing literature does not explain the technical advantages of each type of CRSM. The advantages are explained by comparing the coating elements with one another. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3130 10.55981/jsmi.2024.3130 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 11-23 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/3130/4247 Copyright (c) 2024 Endi Hari Purwanto, Reza, Bendjamin BL., Budhy Basuki, Putty Anggraeni, Nur Tjahyo Eka Darmayanti https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3133 2025-03-27T16:53:53Z jsmi:ART

The Significant Process Variable of Tea Powder Production Based On Spray Dry Method Fitriady, Muhammad Arifuddin Rohmah, Alfissyahriyah Nur RINALDI, NINO Agustian SULASWATTY, ANNY Shabri, Shabri Green tea Spray dry High-density instant tea Significant variable Polyphenol, which is very beneficial to the human body, especially as an obesity inhibitor, is one of the leading nutrient content in green tea leaves. To increase popularity as well as practicability, product development needs to be conducted, one of which is to produce an effervescent instant tea. However, a high-density instant tea powder is required in this product development. This study was conducted to predict the significant process variables which affect the density as well as the yield of the instant tea powder. The exploration of significant process variables was conducted based on the Design of the Experiment, while the tea extract was produced using maceration techniques. Maltodextrin was added to the tea extract based on the concentration filler variable. The instant tea powder was produced by the spray drying method, which variable includes the concentration of maltodextrin (filler), the pump flow rate (feed pump), the outlet temperature (Tout), the fan speed, and the atomization air pressure (nozzle). The tapped density of the instant tea powder was analysed and the yield was calculated for each condition. Based on the Pareto graph, it was found that the atomization air pressure (nozzle) is the most significant variable in the spray dry process of instant tea powder. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3133 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 45-51 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/3133/4290 Copyright (c) 2024 Muhammad Arifuddin Fitriady, Alfissyahriyah Nur Rohmah, Nino Rinaldi, Egi Agustian, Anny Sulaswatty, Shabri Shabri https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3134 2024-07-18T07:32:37Z jsmi:ART

Carbon Nanotube Modified Poly HEMA/CNC Composite Sorbent for Selective Recovery of Rare Earth Metal Ions Jamilah, Nurul Riswoko, Asep Adam Badra Cahaya Adsorption Liquid crystal Cellulose Nanocrystal carbon nanotubes Rare Earth Element Rare earth elements (REEs) from secondary resources need to be purified before being used as critical raw materials. A novel type of carbon nanotube (CNT)--based composite sorbent has been developed to adsorb REE metal ions from a low concentration of aqueous solution. The composite sorbents prepared from HEMA, CNC, and CNT were characterized by FTIR and their adsorption properties by ICP-OES. The results showed that the adsorption performance of sorbents depends on their constituting materials and the pH of the feeding solution. The presence of CNTs in the sorbents helps increase adsorption efficiency while increasing contact time. The highest adsorption efficiency (98%) was achieved at pH 4 with a contact time of 90 minutes. The prepared composite sorbents showed better adsorption selectivity for cerium (Ce3+) ions than neodymium (Nd3+) and lanthanum (La3+). BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3134 10.55981/jsmi.2024.3134 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; 140-149 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/3134/3674 Copyright (c) 2024 Nurul Jamilah, Asep Riswoko, Adam Badra Cahaya https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3135 2025-03-27T16:53:53Z jsmi:ART

Energy Analysis and Economy Performance of a Hybrid Solar Dryer for Drying Coffee Suherman, Suherman Hadiyanto, Hadiyanto Franz, Nicholas Kamandjaja, Vimala Sinuhaji, Tubagus Rayyan Fitra Coffee Drying rate and efficiency Economic analysis Hybrid solar dryer Total fat and protein content This work studies the effect of the drying temperature on the profile of the water content, drying rate, drying efficiency, economic performance, and the quality of Robusta and Arabica coffee beans using the hybrid solar dryer. The drying instrument with the help of LPG heating is used in this research with a specified temperature of 40 ℃, 50 ℃, and 60 ℃. The research is conducted on a sunny day for 1 day for each temperature and coffee beans. The temperature profile shows that the lowest water content in the study is 60 ℃.  The drying rate for both 50 ℃ and 60 ℃ are similar and the highest average efficiency of the instrument is at 50 ℃ for both Robusta and Arabica beans. The dominant peak in GCMS analysis result of coffee samples was caffeine with a total area percentage of 30.89%, the description of the coffee bean structure using SEM test resulted in a hole size of 5-10 µm, the obtained fat content was 1.6%, the obtained protein content 17.3%. A hybrid solar dryer is an environmentally friendly solution that enables faster coffee drying, with a payback period of 1.5 years for both coffee bean types. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3135 10.55981/jsmi.2024.3135 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 25-34 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/3135/4288 Copyright (c) 2024 Suherman Suherman, Hadiyanto Hadiyanto, Nicholas Franz, Vimala Kamandjaja, Tubagus Rayyan Fitra Sinuhaji https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3136 2025-03-27T16:53:53Z jsmi:ART

An Enhanced Nickel Recovery from Mixed Hydroxide Precipitate Through Selective Leaching with KMnO4 Oxidant Gumelar, Muhammad Dikdik Rahayu Saputra Agustanhakri Husin Andrameda Taqwatomo Putra Indrijarso Saudi Indriasari Arfiana Yuliani Mumtaz Mirahati Selective leaching Mixed hydroxide precipitate Potassium permanganate Solvent extraction Nickel Sulfate Mixed Hydroxide Precipitate (MHP), a metal precipitate with the dominant nickel and cobalt content in hydroxide compounds, can be leached as a lithium battery precursor. In this study, KMnO4 was used as an oxidant agent to increase the solubility of Ni and Co. The variation of the sulfuric acid concentration (0.5 - 1.5 M) as a leachate reagent, the concentration of KMnO4 (2.5 - 7.5 g/L), and the selective leaching temperature (60 - 80°C) were investigated. Solvent extraction using CYANEX 272 and D2EHPA was performed to separate the Ni, Co, and Mn. Atomic Absorption Spectrometry (AAS), Inductively coupled plasma mass (ICP-OES), and X-ray Fluorescence (XRF) were used to analyze the chemical compositions. At the same time, crystallographic analysis was observed with X-Ray Diffraction. It was observed that potassium permanganate increased the dissolution of Ni and Co to 91.3% and 85.4% but decreased the dissolution of Mn (37.53%) under the following conditions: 1.75 M sulfuric acid, 7.5 g/L potassium permanganate, and 60°C temperature. High purity of nickel crystal (99.64%) was observed with spontaneous nucleation due to the supersaturated nickel solution after solvent extraction with CYANEX 272. Thus, using permanganate ion as selective leaching of Ni and Co from Mn is promising. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3136 10.55981/jsmi.2024.3136 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 35-44 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/3136/4289 Copyright (c) 2024 Muhammad Dikdik Gumelar, Sri Rahayu, Dita Adi Saputra, Agustanhakri, Saddam Husin, Yurian Ariandi Andrameda, Galih Taqwatomo, Oka Pradipta Arjasa Putra, Surat Indrijarso, Aghni Ulma Saudi, Indriasari, Arfiana, Hanif Yuliani, Naurizza Ratri Mumtaz, Riria Zendy Mirahati https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/3800 2025-03-27T16:53:53Z jsmi:ART

Simulation Of Mechanical Stress On A Solution-Annealed 15-15Ti Steel Using ABAQUS CAE Program Oktavianto, Putra Purwaningsih, Anik Setiawan, Muksin Aji Handayani, Airin Hijrah Mustari, Asril Pramutadi Andi Waris, Abdul 15-15Ti Steel Tensile Test Mechanical Properties Abaqus Program Fracture Phenomenon In addressing the problem of Ti steel (15-15Ti) proposed as the main candidate material for the manufacture of coatings and fuel wrappers for liquid LBE-cooled fast reactors at high temperatures related to material degradation, such as liquid metal embrittlement (LME) and liquid metal corrosion (LMC), Gong et al. conducted research related to the creep failure behavior of solution-annealed 15-15Ti steel exposed to LBE at temperatures of 550 and 600oC using a creep test facility. However, in this study, testing the mechanical properties of 15-15Ti steel through tensile testing was not really discussed, even though the mechanical properties of a material are one of the most important things in determining structural design. The mechanical properties obtained from previous research were then simulated using ABAQUS CAE software to determine the stress distribution profile (initial and final) and the mechanical stress-strain performance used to understand more about the 15–15Ti material. From the simulation results, it was found that the peak force received by the specimen for a strain rate of 1.1 x 10-5s-1 was 6.0 kN, while for a strain rate of 5 x 10-5s-1, it was 6.2 kN. This means that the specimen used cannot accept a force greater than the peak force value. A stress-strain difference graph was also obtained in the experimental results, with simulation results showing a decrease in the value of the fracture point. This is because the mesh setting in the simulation is not close to a more detailed value. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/3800 10.55981/jsmi.2024.3800 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 65-74 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/3800/4292 Copyright (c) 2024 Putra Oktavianto, Anik Purwaningsih, Muksin Aji Setiawan, Airin Hijrah Handayani, Asril Pramutadi Andi Mustari, Abdul Waris https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4302 2025-08-31T13:32:43Z jsmi:ART

Simple Synthesis of 4A Zeolite with the Addition of Al2O3 and Na2EDTA Compounds Dawolo, Januari Telaumbanua, Putra Hidayat O. Laia N. K. Lase Zeolite synthesis 4A zeolite Non-magnetic fly ash Fractionation NaOH Al2O3 Na2EDTA 4A zeolite complex derived from coal has been successfully synthesized through the preparation of fractionated samples, analyzed using atomic absorption spectrophotometry (AAS), resulting in a chemical composition of silica (SiO2) 24.78% and aluminum oxide (Al2O3) 29.60%. The fly ash produced from this fractionation is used as the base material for the synthesis of 4A zeolite. The fly ash is reacted with sodium hydroxide (NaOH) at room temperature, yielding a gel that is subsequently crystallized into 4A zeolite through a reflux process. The resulting zeolite crystals are then supplemented with Al2O3 and disodium dihydrogen ethylenediaminetetraacetate (Na2EDTA) as sources of aluminum to achieve a molar ratio of Si/Al = 1.42. Optimal quality 4A zeolite crystals were obtained from the synthesis of 5.9351 g of medium fraction fly ash, along with 1 g Al2O3, 4 g NaOH, and 0.569 g Na2EDTA. Infrared (IR) characterization results indicate that the optimal 4A zeolite from medium fraction fly ash is characterized by crystals with the addition of 1.5 g of Al2O3. Wide absorption bandwidths are typically caused by large spectral line widths, which can occur if a significant amount of energy is absorbed by various vibrational modes, assuming that excess Al2O3 leads to the formation of functional groups that contribute to the same band. A peak at a wavelength of 564 cm-1 indicates double ring stretching vibrations, while a peak at 661 cm-1 indicates symmetric stretching vibrations of the zeolite framework. Meanwhile, peaks at wavelengths of 3460.86 cm-1 and 974.71 cm-1 indicate detected O-H absorption BRIN Publishing (Penerbit BRIN) 2025-04-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4302 10.55981/jsmi.2025.4302 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 91-98 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/4302/8377 Copyright (c) 2025 Januari Dawolo; Putra Hidayat Telaumbanua; O. Laia, N. K. Lase https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4398 2025-03-27T16:53:53Z jsmi:ART

Electrochemical Investigation of Ethylene Glycol as Corrosion Inhibitor of Al 5052 Habibi Nikitasari, Arini Saifudin Kusumastuti Musabikha Prifiharni Irawan Priyotomo Riastuti Al 5052 Coolant Electric car Electrochemical Ethylene Glycol Nowadays, electric cars use Al 5052 in the cooling pad of the battery coolant system. Corrosion behavior study of Al 5052 by coolant is essential in the automotive industry. Ethylene glycol is the main compound of the battery coolant system that can inhibit the corrosion process of aluminum alloys. The corrosion inhibition performance of ethylene glycol (EG) for Al 5052 surface in 3.5% NaCl solution has been studied using electrochemical measurements such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in various concentrations of EG up to 50% and a temperature range from 30oC to 60oC. Based on results, EG can inhibit the corrosion process of Al 5052. The corrosion rate (CR) of coolant containing EG decreases with increasing that concentration in various temperatures, and the CR of the coolant rises with the increased temperatures. The inhibition efficiency of coolant boosts with the increase in EG concentration in each operational temperature and the highest up to 75% at 60oC with 50% of EG concentration. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4398 10.55981/jsmi.2024.4398 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 53-64 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/4398/4291 Copyright (c) 2024 I. Habibi, Arini Nikitasari, Saifudin, Rahayu Kusumastuti, Siti Musabikha, Siska Prifiharni, Januar Irawan, Gadang Priyotomo, Rini Riastuti https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4568 2025-03-27T16:53:53Z jsmi:ART

Effect of Basalt Size and Composition on Mechanical Properties of Wood Powder Polymer Biocomposite Material and Basalt as Reinforcement Prabowo, Singgih Astuti Birawidha Amin Bahfie Dwi Yanti Savitri Karo Karo Irwanto Biocomposite Wood Powder Basalt Powder Utilization of waste for raw materials for new materials is very potential for research. Wood waste from door and window craftsmen is widely available as the property business develops. Wood waste mixed with polyester resin is modified by adding basalt to produce a biocomposite material with better mechanical properties. This research on the effect of adding the composition and size of basalt to the wood-polyester biocomposite material was studied to see changes in hardness values according to the ASTM E384 standard, compressive strength according to ASTM D695 standard, and its effect on density according to ASTM D1622 standard. The results showed that the higher the composition and the smaller the basalt hardness value, the compressive strength and density increased. The highest values of hardness, compressive strength and density were 36.6 HV0.5, 151.14 MPa, and 0.1420 kg/m3, an increase compared to that without the addition of basalt 26.7 HV0.5, 95.97 MPa, and 0.1288 kg/m3. Changes in the properties of hardness, compressive strength and density are taken into consideration in the formulation of using basalt to obtain new materials according to the desired specifications by utilizing wood waste. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4568 10.55981/jsmi.2024.4568 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 75-80 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/4568/4293 Copyright (c) 2024 Singgih Prabowo, Widi Astuti, David Candra Birawidha, Mirawanty Amin, Fathan Bahfie, Evi Dwi Yanti, Savitri, Pulung Karo Karo, Herma Yudhi Irwanto https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4569 2025-03-27T16:53:53Z jsmi:ART

The Impact of Waste Marble Powder as A Partial Alternative Material for Cement Andreani, Agustina Sus Taopan , Henda V. R. Banunaek , Frengky Seki Nurkhaliza , Farrah Waste marble powder mortar cement Compressive strength Waste marble powder generated from the sawing and the mining activity of marble stone caused environmental problems that harmed human health. This current research aimed to investigate the influence of waste marble powder to substitute cement partially in mortar production. The mortar preparation with the mixture compositions of 0-50% marble powder was investigated for their resistance of compression and their porosity. The characterization was assessed with X-ray Fluorescence (XRF), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), Fourier Transform Infra-Red (FTIR), and X-ray Diffraction (XRD). The finding of this research revealed that a replacement by up to 10% marble powder obtained an increase in compressive strength after 28 days. A low level of marble powder to replace cement led to a less porous microstructure of the mortars. These confirmed that waste marble powder could be applied to manufacture mortars. In addition, the utilization of waste marble powder as an alternative building material would reduce the damage to the environment. BRIN Publishing (Penerbit BRIN) 2024-08-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4569 10.55981/jsmi.2024.4569 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; 81-91 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/4569/4294 Copyright (c) 2024 Agustina Sus Andreani, Henda V. R. Taopan , Frengky Seki Banunaek , Farrah Nurkhaliza https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4922 2026-11-02T08:24:17Z jsmi:ART

Adsorption of Phenol and Iron In Wastewater Using a Mixture of Active Carbon and Zeolite Modified with Chitosan Ratnawati Rian Hidayat M. Cece Ariwirdana Kudrat Sunandar Wahyudin Wahyudin Phenol Fe Activated Carbon Zeolite Chitosan Phenol (C6H5OH) and iron (Fe2+) contained in electroplating industrial wastewater are toxic even at small concentrations. One of the effective methods to remove these compounds is adsorption because the method is easy and simple. Activated carbon and zeolite are types of adsorbents that are often used in wastewater treatment, but both types of adsorbents are not selective in certain chemicals. In this study, modification of zeolite and activated carbon with chitosan was carried out to adsorb waste containing phenol and Fe2+. The variations used were pH (7 and 9) and the adsorbent composition to study its effect on the adsorption of phenol in the presence of Fe2+. Adsorption was carried out in a bed with circulating waste for 2 hours. Feed at pH 9 with adsorbent mixed of zeolite-chitosan composite (Z-Ch) and activated carbon-chitosan composite (AC-Ch) in a ratio of 1:1 gave the optimal results. Under these conditions, 94% and 97% of phenol and Fe2+ were adsorbed, respectively. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4922 10.17146/jsmi.2022.24.1.6691 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 1-7 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4922/3661 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4923 2026-11-02T08:24:17Z jsmi:ART

Effect of Thermomechanical Treatment Combination on Electrochemical Behavior of Nickel Free-Stainless Steel Fe-10Mn-16Cr-3Mo M. Rohmah F.M. Ridlo D Irawan R Roberto P. A. Paristiawan Nickel Free-Stainless steel Fe-10Mn-16Cr-3Mo Thermomechanical combination Corrosion Nickel-free stainless steel has emerged as an implant due to its excellent mechanical and corrosion properties. The toxic effect of Nickel ion released in the conventional SS316L need to be addressed. As one of austenitizing elements used as Nickel substitution, Nitrogen is an important alloying element to improve the strength and resistance to pitting susceptibility. In this research, the Nickel-free Fe-10Mn-16Cr-3Mo stainless steel has been developed. The effect of thermomechanical treatment consists of hot forging, hot rolling, cold rolling, and their combination followed by solution treatment on the electrochemical properties was further investigated. The corrosion resistance of Fe-10Mn-16Cr-3Mo was evaluated by the EIS and polarization test in Hank’s solution at 37℃. A ferrite-austenite duplex structure was identified by microstructural investigation, with indistinct intermetallic phase at homogenized sample. Meanwhile, fully recrystallized grains and twinning structures were formed at thermomechanical samples, indicating in dynamic recovery and dynamic recrystallization. Furthermore, the potentiodynamic parameters demonstrates the protective oxide in all samples. However, sample #5 shows a lower current density, around 0.184 µA/cm2, compared to other samples, indicating more protective passive film. In addition, the corrosion potential of sample #5, around 198 mV leading to higher corrosion resistance up to 0.02894 mmpy. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4923 10.17146/jsmi.2022.24.1.6667 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 8-15 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4923/3662 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4924 2026-11-02T08:24:17Z jsmi:ART

Influence of Applied Potential on The Structural and Optical Properties of Cu2O Thin Films Grown by Electrochemical Deposition A Maddu V Lestari M N Indro Bandgap energy Cu2O thin films Electrodeposition Potential Structure Cu2O thin films have been deposited on indium-tin-oxide (ITO) coated glass substrate by electrochemical method or electrodeposition. The effect of deposition potential on the microstructure and optical properties of Cu2O thin films was studied. Electrodeposition for two Cu2O thin films was carried out at –0.5V and –0.6V relative to the standard calomel electrode (SCE) as a reference electrode. Cu2O thin films were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and UV-Visible spectroscopy. The diffraction pattern indicated the cubic structure of the Cu2O crystal has been well grown. The lattice parameters of Cu2O films slightly increased as the potential of electrodeposition increased. The crystallite size of Cu2O films significantly increased as the applied potential increased. Cu2O thin films showed a smooth and flat surface morphology based on SEM images. The optical transmittance of the Cu2O thin films drastically decreased as the applied potential increased due to the film thickness increasing. The bandgap energy of Cu2O films based on the Tauc plot increased as the applied potential increased, that is 2.0 eV for the film deposited at -0.5V and 2.13 eV deposited at -0.6V. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4924 10.17146/jsmi.2022.24.1.6709 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 16-23 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4924/3665 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4925 2026-11-02T08:24:17Z jsmi:ART

Influence of Glucose, Urea and Bacteria Concentration On Nata De Cassava Preparation Using Liquid Tapioca Waste Medium M. Ghozali Y Meliana W K Restu E Triwulandar M Chalid Acetobacter xylinum Bacterial Cellulose Liquid Tapioca Waste Nata de cassava Yield In this research, Nata de Cassava as the obtained bacterial cellulose was synthesized by Acetobacter xylinum using the liquid tapioca waste as the media. This research aimed to investigate the influence of concentration from carbon and nitrogen sources and then the type of bacteria used toward the obtained Nata de Cassava. The liquid tapioca waste was heated in a beaker glass at 70-80 °C and then added 5-10 % (w/v) of sugar and 0.1-0.5 % (w/v) of urea. The mixed solution was poured into a container and then cooled. Furthermore, 10-20 % (v/v) of Acetobacter xylinum was added and incubated at room temperature. After ten days, the Nata de cassava was harvested, sterilized, and immersed in ethanol, then dried in an oven at 60 °C. The results of FTIR, XRD and SEM analysis showed that Nata de Cassava had been successfully synthesized. The composition that produced the highest Nata de Cassava yield of 2.41% was the composition using 15% of A. xylinum, 10% of glucose and 0.1% of urea in the fermentation medium. In addition, the composition that produced the highest carbon conversion ratio of 26.15% was the composition that used 10% of A. xylinum, 5% of glucose and 0.2% of urea in the fermentation medium. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4925 10.17146/jsmi.2022.24.1.6669 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 24-35 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4925/3664 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4926 2026-11-02T08:24:17Z jsmi:ART

Sensing Properties of ZnO-SWCNT Hybrid Nanostructure Coated on Flexible Substrate for CO2 Gas Detection Aisyah Nur Estri Riyani Tri Yulianti Qonitatul Hidayah Surip Kartolo Rike Yudianti Gas Sensing Properties Functionalized SWCNTs Flexible Substrate We report sensing properties of functionalized single walled carbon nanotubes (f-SWCNTs) deposited on the flexible substrate of silicon (Si)  and polyethylene tereptaphalate (PET).  Deposition of f-SWCNT  on Si rubber and PET surface was conducted by applying different manner  of  spray coating and dip coating  techniques, respectively. Surface modification of f-SWCNT by ZnO nanostructure layer were applied by hydrothermal process.The research study  were conducted to know the effect of substrate material and ZnO structure on the f-SWCNT surface which embedded in those flexible polymer substrates. The results reveal that f-SWCNT on Si substrate (f-SWCNT/Si) do not have a good  response in gas sensing performance. In meanwhile  f-SWCNT on PET substrates (f-SWCNT/PET) is more sensitive about 1.6% with 3s in response.  ZnO structure layer modifying the surface structure of f-SWCNT enhance the sensitivity and responsiveness of the sensor with sensitivity of 4.1 % in 2s response after CO2 injection. Effect of bending treatment of the sensor and its stability were further investigated. Morphological surface of f-SWCNT network and crystal structure of ZnO and f-SWCNT were also observed by scanning electron microscope (SEM) and X-ray diffraction, respectively BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4926 10.17146/jsmi.2022.24.1.6679 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 36-44 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4926/3666 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4927 2026-11-02T08:24:17Z jsmi:ART

The Effect of Conventional and Sonochemical Synthesis Methods on Gd2O3 Nanoparticles Properties Muflikhah W Z Lubis Mujamilah M Azizah R P Caesariyant Gd2O3 Sonochemical Paramagnetic MRI Paramagnetic Gd2O3 nanoparticles have been widely used as a contrast agent in bioimaging such as Magnetic Resonance Imaging (MRI). In this study, Gd2O3 nanoparticles were prepared using conventional and sonochemically precipitation methods, without any stabilizers. Gadolinium nitrate was used as a precursor and ammonium hydroxide as precipitating agent. The synthesized Gd2O3 nanoparticles were characterized using X-Ray Diffractometer (XRD), Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), and Vibrating Sample Magnetometer (VSM). It was found that Gd2O3 nanoparticles obtained in both methods have a cubic phase. The saturation magnetization (Ms) values of conventional and sonochemical samples were 1.63 emu/g and 1.44 emu/g respectively. The morphology of both samples shows agglomerated spherical shape in the nanometer range. The nanoparticles size of Gd2O3 that was confirmed by the Dynamic Light Scattering technique show samples from the sonochemical method has narrower size distribution (higher homogeneity) compare to samples from the conventional method. It was also found that the sonochemical synthesis technique is faster (time-saving), simple, convenient, and environmentally benign. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4927 10.17146/jsmi.2022.24.1.6674 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 45-50 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4927/3667 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4929 2026-11-02T08:29:37Z jsmi:ART

Topology Optimization of a Composites Frame Structure considering ply orientation for MALE UAV I B Wiranto S O Saraswat I R Alfikri Chairunnisa A Aribowo Topology optimization MALE UAV Carbon fiber Finite element method This research employs the Finite element method to optimize the frame structure of a Medium Altitude Long Endurance (MALE) Unmanned Aerial Vehicle (UAV). The material used in this study is a unidirectional carbon fiber stacked in a specific sequence. The topology optimization process is conducted to achieve a lightweight structure whilst maintaining its integrity. The design constraint is set to reduce 50% weight and minimize the strain energy. The benchmark phase was performed while considering a previously done study to validate the proposed method. The results of this study have successfully reduced 34% (0.581 kg) weight of frame structure. First failure predicition study using Hashin criterion, shows the first failure occurred in the matrix of Ply-2 at 9000 N. BRIN Publishing (Penerbit BRIN) 2022-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4929 10.17146/jsmi.2022.24.1.6687 Jurnal Sains Materi Indonesia; Vol. 24 No. 1 (2022); 51-58 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4929/3668 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4933 2024-07-18T07:32:37Z jsmi:Ed

Front Matter (Editorial Team, Preface and Table of Contents) Rahman, Andri BRIN Publishing (Penerbit BRIN) 2024-05-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/4933 Jurnal Sains Materi Indonesia; Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia; i-v 2614-087X 1411-1098 10.55981/jsmi.v25i2 eng https://ejournal.brin.go.id/jsmi/article/view/4933/3675 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4948 2026-11-02T08:16:05Z jsmi:ART

COMPARATIVE LIFE CYCLE ASSESSMENT OF EDTA-MODIFIED AND AMINE GRAPTHED SILICA XEROGELS K. Megasar A. N. Chintia A. Saputra EDTA Environmental impacts Life cycle assessment Silica xerogels COMPARATIVE LIFE CYCLE ASSESSMENT OF EDTA-MODIFIED AND AMINE GRAPTHED SILICA XEROGELS. NaI-131 removal from hospital wastewater using various silica xerogel adsorbents has been studied in order to meet the clearance level of radioactive waste. The contaminants emitted from the adsorbent manufacturing may affect the environment and human health. This study aimed to assess and minimize the environmental impacts of two adsorbents: EDTA-modified xerogel silica (EDTA Si-Xe) and Amine grafted silica xerogels (Amine Si-Xe), utilizing life cycle assessment (LCA) with the cradle to gate approach. OpenLCA 1.7 was used to estimate the impact, where background data were acquired from the European reference Life Cycle Database (ELCD) 3.2. The results show the dominant environmental impact resulting from adsorbent manufacturing is climate change. The impact of climate change on EDTA Si-Xe manufacturing and Amine Si-Xe manufacturing is about 0.510 CO2-eq and 0.258 CO2-eq, respectively. EDTA Si-Xe manufacturing performed the best (lower environmental impact) compare to Amine Si-Xe manufacturing. The process stage that contributes dominantly to environmental impact is calcination which gives high environmental impacts to climate change. The percent contribution of calcination to the environmental impact on EDTA Si-Xe manufacturing and Amine Si-Xe manufacturing is about 87% and 66%, respectively. The environmental impacts of the adsorbents manufacturing especially in climate change can be reduced by using Capture Carbon Storage (CCS) technology. Improvement analysis shows EDTA Si-Xe performed lower environmental impact compare to Amine Si-Xe with the value of impact categories lower than without applied CCS technology, especially value of climate change. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4948 10.17146/jsmi.2022.23.5.6343 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 52-60 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4948/3676 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4950 2026-11-02T08:16:05Z jsmi:ART

APPLICATION OF RIETVELD ANALYSIS TO THE MULTIPHASE CRYSTAL STRUCTURE Bi1/2K1/2TiO3 USING MOLTEN SALT SYNTHESIS S. Ahda A. Taufiq Mardiyanto A. Mahyudin E. Sukirman Piezoelectric Molten Salt Method Williamson - Hall Plot APPLICATION OF RIETVELD ANALYSIS TO THE MULTIPHASE CRYSTAL STRUCTURE Bi1/2K1/2TiO3 USING MOLTEN SALT SYNTHESIS. Recently, an interesting application development of piezoelectric materials is as part of the tool for in-situ testing of nuclear fuel and the supporting materials in nuclear reactor, as well as sensors for safety systems in the reactor environment itself. One of the piezoelectric materials (lead free) is bismuth potassium titanate Bi1/2K1/2TiO3 (BKT) which is used in this research and has been successfully synthesized using the molten salt method. This method is a simple process that reacts to the base material in a solution of NaCl and KCl salts to produce nanocrystal ceramics powder with good compositional homogeneity and sinterability. The synthesis process has been carried out in two stages, first to produce Bi2Ti4O11 and then to add excess K2CO3 as a base material to produce BKT. The weight ratio between Bi2Ti4O11 and excess K2CO3 was 1:1.5 and 1:2. Structural identification of the synthesized results has been done by Rietveld analysis of the XRD pattern using PAN-Analytical Highscore software. The multiphase of BKT has been obtained by a predominantly tetragonal crystal system, in addition to cubic as second phase. This is indicated by the content of the tetragonal and cubic phases obtained at 64.5 and 36.5% for the ratio 1:1.5 and 80.3 % and 19.7 % for the ratio 1:2, respectively.The addition of excess K2CO3 increases, the content of the tetragonal BKT phase increases. . Besides that, the “a” lattice parameter increases and the “b” lattice parameter decreases, if the K2CO3 content is added. Likewise, the size of the crystallite and microstrain decreases with the in excess K2CO3. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4950 10.17146/jsmi.2022.23.5.6356 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 61-67 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4950/3678 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4951 2026-11-02T08:16:05Z jsmi:ART

NANORODS ZnO THIN FILM PERFORMANCE AS TRANSPARENT HEATERS. L. Suhaim A. H. Yuwono Nanorods ZnO Transparent heaters NANORODS ZnO THIN FILM PERFORMANCE AS TRANSPARENT HEATERS. Transparent heaters have been used for various applications. In this research, a transparent heater made from ZnO nanorods has been successfully fabricated. ZnO nanorods were produced by using the chemical bath deposition method.The results of the XRD investigation showed that the ZnO_0.015 and ZnO_0.025 samples contained three and five ZnO peaks, respectively, with a hexagonal wurtzite crystal structure. The crystallite size increased along with the increase in the solution concentration from 71.198 nm to 82.924 nm. The morphological characterization of the samples using FE-SEM showed that ZnO_0.025 sample had a better surface covarege than ZnO_0.015 sample. The average diameters of ZnO_0.015 and ZnO_0.025 are 127.130 and 146.756 nm, respectively. The transmittance value decreased along with the increase of solution concentration which is from 55% to 53%. The value of the band gap energy decreased as the concentration of the seed solution increased from 3.25 eV to 3.20 eV. The resistivity values of ZnO_0.015 and ZnO_0.025 are 1.126 x 10-4 and 0.824 x 10-4Ωcm, respectively. From these results it appears that ZnO_0.025 sample has a more optimal performance as a transparent heater compared to ZnO_0.015 sample. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4951 10.17146/jsmi.2022.23.5.6395 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 68-73 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4951/3679 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4952 2026-11-02T08:16:05Z jsmi:ART

THE ADVANCED ELECTRIC FIELD FROM QUAD-ELECTRODE MODE FOR BLOOD CANCER TRAPPING: SIMULATION STUDY M. Firdhaus U. Farahdina V. Z Zulfa M. Haekal Endarko A. Rubiyanto Nasori A. R. H. Tahier Darsono Blood Cancer Filtering Electric Field Good Health Dielectrophoresis THE ADVANCED ELECTRIC FIELD FROM QUAD-ELECTRODE MODE FOR BLOOD CANCER TRAPPING: SIMULATION STUDY. Blood cancer is a disease caused by the rapid cleavage of white blood cells (WBC), which increases in the human circulatory system. Furthermore, based on the original nature of WBC during cleavage, which is the same as ionic bonds, electric field filtering, and trapping is used to treat leukemia patients. The electric field generated by the electrode with an AC voltage source plays a role in the migration of the WBC to high electric field intensity. The Quad-electrode field distribution is conducted using the Finite Element Method (FEM), and an electric field gradient analysis is conducted to determine the effectiveness of each coordinate system. According to the simulation results, the second model with an input voltage of 0.68 V has the highest intensity of electric field distribution, with an effective depth at Z = 30 mm, and the best coordinate along the X-axis and Y-axis are 30 mm. In conclusion, the center of the Quad-electrode system center is the best location for placing filters and trapping leukocytes by utilizing electric field distribution on the electrode system for the development of blood cancer biomedical therapy technology. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4952 10.17146/jsmi.2022.23.5.6427 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 74-82 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4952/3680 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4954 2026-11-02T08:16:05Z jsmi:ART

MECHANICAL PROPERTIES OF PINEAPPLE LEAF FIBER/ EPOXY COMPOSITES WITH 0°/0°/0°/0° AND 0°/90°/0°/90° FIBER ORIENTATIONS A. S. Afkari R. A. Pratama A. L. Juwono S. Roseno Pineapple leaf fiber Composites Fiber orientation Flexural Properties MECHANICAL PROPERTIES OF PINEAPPLE LEAF FIBER/ EPOXY COMPOSITES WITH 0°/0°/0°/0° AND 0°/90°/0°/90° FIBER ORIENTATIONS. Pineapple leaf fiber can replace synthetic fiber because of its environmentally friendly and abundant availability in Indonesia. The purpose of this study was to obtain the mechanical properties of the pineapple leaf fiber/epoxy composite with 0°/0°/0°/0° and 0°/90°/0°/90° fiber orientations. Pineapple leaf fiber from Subang Indonesia was pre-treated through alkalization. The composites were fabricated by hand lay-up, followed by the vacuum bagging method. The results showed that the flexural properties of both composites were higher than the tensile properties of both composites. The flexural strength and modulus of 0°/0°/0°/0° composites were higher than those of 0°/90°/0°/90° composites, with the values of (109.57 ± 8.12) MPa and (7.08 ± 0.62) GPa respectively. Morphological observations using a Scanning Electron Microscope (SEM) showed that pineapple leaf fiber and epoxy had strong interfacial bonds and few voids. According to SNI 01-4449-2006 for fiberboard, pineapple leaf fiber/ epoxy composites with 0°/0°/0°/0° and 0°/90°/0°/90° fiber orientations were categorized as high-density fiberboard type T2 45, because both composites had a density higher than 0.84 g/cm3 and a flexural strength higher than 45 MPa. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4954 10.17146/jsmi.2022.23.5.6491 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 83-89 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4954/3681 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4955 2026-11-02T08:16:05Z jsmi:ART

Ag and Pd Fission Product Implantation in SiC layer of TRISO Fuel Particle of HTGR using SRIM/TRIM Monte Carlo Computer Mardiyanto N. Shabrina A. K. Riva HTGR SiC Ag Pd SRIM/TRIM Corrosion Ag AND Pd FISSION PRODUCT IMPLANTATION ON SiC LAYER IN TRISO FUEL PARTICLE OF HTGR USING SRIM/TRIM MONTE CARLO COMPUTER. Silicon Carbide (SiC) has excellent characteristics such as wide band gap, high electron mobility, high thermal conductivity, and radiation effects resistance. Therefore, SiC is widely used for various applications, including nuclear fuel systems. SiC is used in TRISO (Tri-Structural Isotropic) coated fuel particle in HTGR (High Temperature Gas cooled Reactor). TRISO, which consists of Inner Pyrolitic Carbon, SiC, and Outer Pyrolitic Carbon, is one of the safety systems features of the reactor. However, one of the issues of the system is corrosion of SiC caused by silver (Ag) and palladium (Pd). Nevertheless, the detailed mechanism of this corrosion phenomenon, such as the existence of Ag and Pd and how deep those two fission products penetrate the SiC layer, are still unknown. This study aims to investigate the physical interaction of Ag and Pd with the SiC coating layer of TRISO nuclear fuel particles. For this purpose, the physical effect of the penetration of the energetic Pd and Ag fission products into the SiC layer has been simulated using SRIM (Stopping and Range of Ions in Matter) /TRIM (TRansport of Ions in Matter) computer code with Monte Carlo method. Various Ag and Pd ion kinetic energies have been employed in this simulation. The results showed the Ag/SiC and Pd/SiC Ion Ranges, Doses, and Damage as the first-step evaluation to understand the corrosion phenomenon of the SiC-layer in the TRISO particles of HTGR. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4955 10.17146/jsmi.2022.23.5.6499 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 90-96 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4955/3682 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4956 2026-11-02T08:16:05Z jsmi:ART

TEXTURE CHARACTERIZATION OF THE COPPER PRODUCED BY ECAP PROCESS USING NEUTRON DIFFRACTION TECHNIQUE M. R. Muslih T. H. Priyanto M. Rifai Andryansyah R. Riastuti Neutron diffraction texture ECAP TEXTURE CHARACTERIZATION OF THE COPPER PRODUCED BY ECAP PROCESS USING NEUTRON DIFFRACTION TECHNIQUE. Texture and hardness characterization have been carried out on market copper samples that have gone through the equal channel angular pressing (ECAP) process. Neutron diffraction technique had been used for obtaining an average crystalline texture in a particular volume non destructively to the sample. The ECAP process is carried out once (1 pass) with some parts that have been plastically deformed and some parts that have not been deformed. Crystalline texture and hardness were observed in the deformed and non-deformed parts. Initial characterization was carried out by X-ray diffraction (XRD) followed by measurement of crystal texture using the neutron diffraction technique, while hardness was tested using the Vickers method. Rod-shaped sample with a diameter of 10 mm. Texture observations were performed at the center of the sample with a neutron beam limiting slit of 5x5 mm2 . There was an increase in hardness in the deformed position compared to the undeformed one. The texture that occurs is in the form of fibers with different directions and indexes, sequentially as follows: position 1, [111] of 4.96 m.r.d., position 2, -[111] of 1.86 m.r.d. and position 3 [010] of 2.44 m.r.d. , position 4 orientation is distributed on [011], [013], [115], [235] fibers with a texture index range of 1.07–1.33 m.r.d. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4956 10.17146/jsmi.2022.23.5.6604 Jurnal Sains Materi Indonesia; Vol. 23 No. 2 (2022); 97-107 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4956/3683 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4963 2025-08-31T13:32:43Z jsmi:ART

Powder Coating Waste Utilization as a Filler in High-Density Polyethylene (HDPE) Coupled with PP-g-MA Shinta Dewi Ariantika Mochamad Chalid Azizah Intan Pangesty Composite Coupling Agent Polyester Powder Coating The powder coating process in industry typically generates waste during curing process. This non-recyclable and hazardous powder-coating waste is utilized as filler material in this research. Polyester was employed as filler in the High-Density Polyethylene (HDPE) Matrix Composite. The study investigated the impact of polyester composition at 20%, 30%, and 40%, with 5% of PP-g-MA coupling agent addition. To assess the effect as a coupling agent, 0%, 2%, 5%, and 10% of PP-g-MA were added to the composite with a matrix-filler ratio of 70:30. Mixing was conducted using the hot melt mixing method at 180°C and mixing speed 60 rpm, with duration 9 minutes. The characterization and tests include the measurements of surface tension using SEM, FTIR, TGA, DSC, and micro-tensile tests. The results indicate that polyester and PP-g-MA composition decrease the thermal properties of the composite. However, increasing the filler addition by up to 30% and PP-g-MA addition by up to 5% enhances the thermal properties. The tensile strength and stiffness of the composite with polyester filler and PP-g-MA are higher than pure HDPE. These are achieved with the addition of polyester filler 20% and a coupling agent composition of PP-g-MA at 5%. BRIN Publishing (Penerbit BRIN) 2025-04-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4963 10.55981/jsmi.2025.4963 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 99-111 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/4963/8378 Copyright (c) 2025 Shinta Dewi Ariantika, Mochamad Chalid, Azizah Intan Pangesty https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4998 2026-11-02T08:05:41Z jsmi:ART

Synthesis of L-Lactic Acid from Fermentation of Cassava Pulp by Using Tempeh Inoculum Rossy Choerun Nissa D. Sumiarsa W. Kosasih B. Firdiana A. H. D. Abdullah Cassava waste pulp Lactic acid Tempeh inoculum R.S.M. Box-Behnken This study used cassava waste pulp as a fermentation substrate to produce lacticacid using a tempeh inoculum. Tempeh inoculum is a mixed culture of Rhizopus with Rhizopusoligosporus as the primary fungus. Lactic acid is an organic acid most widely used in the food,pharmaceutical, cosmetic and chemical industries. One of the important uses of lactic acid is as a rawmaterial for producing Polylactic Acid (PLA) biopolymers, namely polymers that can decomposenaturally in a relatively fast time. The analysis was performed using the Response SurfaceMethodology (RSM) method and the Box Behnken Design (BBD) experimental design with substrateconcentration parameters, inoculum concentration, and incubation time on lactic acid. Thefermentation process is carried out using a flask shaker at a temperature of 30 ºC, pH 6.0, and arotational speed of 150 rpm. The optimum yield for lactic acid is 6.65 g/L. It was acquired at substrate20 g/L, inoculum concentration 0.30 % (w/v) at an incubation time of 72 hours. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4998 10.17146/jsmi.2021.23.1.6265 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 1-8 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4998/3693 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/4999 2026-11-02T08:05:41Z jsmi:ART

The Physicochemical Characteristics of Recycled-Plastic Pellets Obtained from Disposable Face Mask Wastes V. Saraswaty R. C. Nissa B. Firdiana A. H. D. Abdullah recycle face mask waste pellet plastic The government policy to wear a face mask during the COVID-19 pandemic hasincreased disposable face mask wastes. Thus, to reduce such wastes, it is necessary to evaluate thephysicochemical characteristics of disposable face masks wastes before the recycling process andthe recycled products. In this study, physicochemical characterization of the 3-ply disposable facemasks and the recycled plastic pellets after disinfection using 0.5% v/v sodium hypochlorite wereevaluated. A set of parameters including the characterization of surface morphology by a scanningelectron microscope (SEM), functional groups properties by a fourier transform infra-red spectroscopy(FT-IR), thermal behavior by a differential scanning calorimetry (DSC), tensile strength and elongationat break were evaluated. The surface morphological of each layer 3-ply disposable face mask showedthat the layers were composed of non-woven fibers. The FT-IR evaluation revealed that 3-plydisposable face mask was made from a polypropylene. At the same time, the DSC analysis found thatthe polypropylene was in the form of homopolymer. The SEM analysis showed that the recycled plasticpellets showed a rough and uneven surface. The FT-IR, tensile strength and elongation at break ofthe recycled plastic pellets showed similarity with a virgin PP type CP442XP and a recycled PP fromsecondary recycling PP (COPLAST COMPANY). In summary, recycling 3-ply disposable face maskwastes to become plastic pellets is recommended for handling disposable face mask wastes problem. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4999 10.17146/jsmi.2021.23.1.6336 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 16-23 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/4999/3694 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5000 2026-11-02T08:05:41Z jsmi:ART

Antioxidant Activity, Skin Irritation Potential and Chemical Composition of Clove Leaf Oil from West Java Indonesia D. Rahm R. Yunilawati I. Setiawat Irwinanita B. N. Jati A. Riyanto Yemirta N. N. Aidha Clove oil antioxidant activity potential skin irritation – Essential oils with specific chemical compositions have the potential as a source ofantioxidants in cosmetics, however, in general, essential oils are not safe because of the potential forskin irritation. This study aims is to perform fractionation to obtain clove oil with a chemical compositionthat is safe on the skin and does not reduce its antioxidant activity. Fractionation was performed at atemperature of 100 – 285 oC. Chemical composition was determined by Mass ChromatographySpectrometry (GC-MS), antioxidant activity by DPPH method, and irritation potential by in-vivo patchtest. The results showed chemical components of clove oil were eugenol, copaene, betacaryophyllene, iso-eugenol, alpha caryophyllene, cadinene, caryophyllene oxide, caryophylla andbeta caryophylla. Fractions with chemical compositions of eugenol and beta caryophyllene as themain components and copaene, iso-eugenol, alpha caryophyllene, cadinene as secondarycomponents have very light erythema and no potential irritation to the skin. The fraction produced fromthe fractionation of crude clove oil at a temperature of 235 – 260 oC has the highest antioxidant activityof 10.17 mg/L. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5000 10.17146/jsmi.2021.23.1.6398 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 24-30 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5000/3695 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5001 2026-11-02T08:05:41Z jsmi:ART

Annealing Temperatures’ Effects on Microstructure and Optical Properties of Ba0.95Sr0.05TiO3 Films Y. Iriani F. Nurosyid R. Mayasar D. K. Sandi Ba0,95Sr0,05TiO3 films annealing temperature microstructure optical properties Ferroelectric materials, one of which is Barium Strontium Titanate (BST), can be appliedfor photovoltaic. Ferroelectric films function as the P-type semiconductor in the P-N junction. BST(Ba0.95Sr0.05TiO3) films have been deposited on Pt/Si (111) and quartz substrates via the CSD methodprepared by spin coater. The films were annealed at various temperatures of 800°C, 900°C, and 1000°Cto observe the annealing temperatures' effects on the microstructure and optical properties of the BSTfilms. From the XRD results, the intensity of diffraction peaks gets higher along with the higher annealingtemperature. It thus causes the level of crystallization and the crystal size of the Ba0.95Sr0.05TiO3 films toincrease. The morphology results reveal that the grains size of the Ba0,95Sr0,05TiO3 films is getting largerwith the higher annealing temperature. The optical properties examined in the Ba0.95Sr0.05TiO3 films includeabsorbance and bandgap energy values. Values of bandgap energy show a decrease with increasingsintering temperature. The smallest bandgap energy of the Ba0.95Sr0.05TiO3 film is achieved at 1000oC of3.20 eV. BST films were annealed at temperature 1000oC attained from this study can be considered ascandidate for a photovoltaic ferroelectric material. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5001 10.17146/jsmi.2021.23.1.6338 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 31-36 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5001/3696 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5002 2026-11-02T08:05:41Z jsmi:ART

Study on the Effect of Composition and Variation of Sn/Zn Cooling Media on Nickel Alloy Steel through Hot Forging and Austempering S. Herbirowo M. Harimurti S. A. Chandra D. P. Utama B. Adjiantoro Y. M. Zulaida alloy steel grinding ball austempering hot forging Laterite steel with nickel content is expected to be a solution to overcome the lackof domestic steel availability and dependence on imports. This research was conducted to developNickel-Chromium-Molybdenum alloy steel used Grinding ball for cement industrial applications.Grinding ball is the one of imported steel products needed to be crushing and size reduction the oresor cement. In addition to import issues, grinding balls have a significant problem: their mechanicalproperties that do not meet SNI 1049 require the material to have a minimum hardness value of 45HRC. In this study, the characteristics of Nickel alloy steel were investigated further through heattreatment of forgings heated at the austenitizing temperature of 950 °C and austempering withvariations in the cooling medium of Sn/Zn solution. The cooling medium was chosen because it hasa melting temperature in the phase diagram area to form the bainite microstructure with complex andchallenging characteristics, both of which are required in material for grinding ball applications. Inparticular, the hardness value that passed the SNI 1069 standard was the use of samples with a CrMo alloy of 1%-wt with a hardness value of 45.92 HRC for Sn Austemper and 48.07 HRC for Znaustemper. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5002 10.17146/jsmi.2021.23.1.6374 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 37-42 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5002/3697 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5003 2026-11-02T08:05:41Z jsmi:ART

Identification of Bainite in a Multi-phase Microstructure of an Austempered Steel Alloy: AMetallography Approach M. Y. HasbI F. Citrawati M. R. Wida’atullah S. A. Chandra L. Suhaem austempering steel bainite microstructure color etching Structural characterization of a multi-phase steel has become an exciting issue invarious studies to date. This relates to the difficulty in distinguishing phases with similar morphology,i.e. bainite and martensite, through chemical etching. This study discusses a method to observebainite phase through a metallographic approach on FeNi steel using color etching. Variations in theuse of etching in this research include 2% nital, 4% picral, and 15% sodium metabisulphite (SMB).First, the samples were austenized then austempered at either 400 °C or 500 °C, for 60 minfollowed by quenching in either water or brine solution. Based on optical microscope observations,SMB color etching provides more explicit information on the visualization of bainite and martensitephases because they have different color appearances. The bainite phase is shown in bluish color,while the martensite phase is shown in brownish color. Furthermore, the influence of variation inaustempering temperature and quench media on microstructure morphology was also discussed. Inaddition, the calculation of the lattice parameters of the X-Ray Diffraction (XRD) pattern was alsocarried out in this study to identify the crystal structure formed. BRIN Publishing (Penerbit BRIN) 2021-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5003 10.17146/jsmi.2021.23.1.6401 Jurnal Sains Materi Indonesia; Vol. 23 No. 1 (2021); 43-49 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5003/3698 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5008 2026-11-02T08:00:37Z jsmi:ART

A SYNERGISTIC ABSORPTION AND PLASMONIC EFFECT OF SiO2@Au@TiO2 IN A TiO2 PHOTOANODE FOR DYESENSITIZED SOLAR CELLS Matius Nata Pakpahan Aldi Hartanto Yonatan Davidson Gultom Nur Fadhilah Doty Dewi Risanti Dye-Sensitized Solar Cells Plasmonics Absorption Silica PENYERAPAN SINERGI DAN EFEK PLASMONIK SiO2@Au@TiO2 DALAM FOTOANODE UNTUK SEL SURYA TERSENSITISASI PEWARNA. Untuk meningkatkan pemanenan cahaya tampak di dalam Dye-Sensitized Solar Cells (DSSC), anoda foto TiO2 ditambahkan dengan struktur nano plasmonik. Struktur nano core/multishell SiO2@Au@TiO2 dengan SiO2 yang digunakan berasal dari hasil ekstraksi lumpur Sidoarjo telah disintesis dan dicampurkan ke dalam anoda foto TiO2. Di samping itu, jumlah Au dalam struktur core/multishell yang divariasikan dengan jumlah 60 ml, 90 ml, dan 120 ml. Fraksi core/multishell SiO2@Au@TiO2 terhadap pasta TiO2 divariasikan, yakni 0,5%, 1%, dan 5%. Dari hasil pengujian UV–Vis terlihat bahwa absorpsi dari SiO2@Au@TiO2 hanya berbeda pada panjang gelombang yang besar sebagai efek dari adanya kluster partikel nano dalam ukuran besar, namun demikian nilai efisiensi dari ketiga variasi Au dengan 3 variasi fraksi tidak menunjukkan hasil yang signifikan dibandingkan dengan anoda foto dengan TiO2 saja. Hasil uji Incident Photon-to-Current Efficiency (IPCE) menunjukkan hal serupa seperti kurva J-V, spektrum dari anoda foto dengan struktur core/multishell SiO2@Au@TiO2 sedikit lebih tinggi dan lebar dibandingkan dengan anoda foto TiO2 saja. Hal ini menunjukkan efek sinergistik dari plasmonik dan keberadaan silika di dalam struktur nano tersebut. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5008 10.17146/jsmi.2021.22.3.6175 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 53-61 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5008/3700 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5009 2026-11-02T08:00:37Z jsmi:ART

THE IMPROVEMENT OF RAMIE FIBER PROPERTIES AS COMPOSITE MATERIALS USING ALKALIZATION TREATMENT: NaOH CONCENTRATION Umi Lailatul Jamilah Sujito Sujito composite material alkalization ramie fiber characteristics PENINGKATAN PROPERTIS SERAT RAMI SEBAGAI PENYUSUN MATERIAL KOMPOSIT MELALUI PERLAKUAN KIMIA ALKALISASI: KONSENTRASI NaOH. Serat rami merupakan serat tumbuhan yang memiliki kualitas baik dan berpotensi sebagai penyusun material komposit. Pada penelitian ini dilakukan modifikasi permukaan serat rami melalui perlakuan kimia alkalisasi dengan variasi konsentrasi NaOH 0%, 4%, 5%, 6%, 7%, 8% dan 9% menggunakan magnetic stirrer dengan kecepatan 200 rpm pada suhu 70οC selama 5 jam. Serat rami hasil alkalisasi dikarakterisasi menggunakan metode Cheson untuk mengetahui komposisi kimia serat rami, uji FT-IR untuk mengetahui gugus fungsi serat rami, uji morfologi untuk mengetahui struktur permukaan dan diameter serat rami, serta uji tarik untuk mengetahui kuat tarik dan modulus tarik komposit PLA/rami. Secara keseluruhan peningkatan konsentrasi NaOH hingga persentase 8% mampu meningkatkan kadar selulosa dan lignin serat rami yaitu 88,180% dan 2,444%, serta menurunkan kadar hemiselulosa yaitu 1,446%. Perlakuan alkalisasi NaOH 8%, optimum menurunkan sifat hidrofilik pada serat. Peningkatan konsentrasi NaOH membuat permukaan serat semakin bersih dan diameternya semakin kecil, namun struktur serat mengalami kerusakan pada konsentrasi NaOH lebih dari 8%. Hasil uji tarik menunjukkan serat rami hasil alkalisasi dengan konsentrasi NaOH 8% menghasilkan komposit PLA/rami dengan kuat tarik dan modulus tarik tertinggi yaitu 57,37 MPa dan 248,25 MPa. Dengan demikian, propertis serat rami optimum ditingkatkan menggunakan metode alkalisasi pada konsentrasi NaOH 8%.  BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5009 10.17146/jsmi.2021.22.3.6182 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 62-70 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5009/3701 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5011 2025-08-31T13:32:43Z jsmi:ART

The Effect of Ionic Liquid and Lithium Salt Electrolyte Addition on The Characteristics of Polyvinyl Alcohol/Chitosan-Based Membranes Handika, Rudi Satya Ratri, Christin Rina Rohib, Rohib Nugraha, Adam Febriyanto Chitosan Polyvinyl alcohol 1-hexyl-3 methylimidazolium iodide ionic liquid Lithium bis(oxalate) borate electrolyte Li-ion battery The development of an environmentally friendly polymer electrolyte membrane for lithium-ion batteries is essential. A composite membrane composed of chitosan and polyvinyl alcohol (PVA) is one of the eco-friendly polymer membrane types used for lithium-ion battery electrolyte. This study examined the effect of ionic liquid 1-hexyl-3-methylimidazolium iodide (HMII) and lithium bis(oxalate) borate (LiBOB) electrolyte addition on the characteristics of composite membranes made of chitosan and PVA. The results reveal that the addition of LiBOB and HMII was able to promote the agglomerations and the formation of microcrystals, which increased the mechanical properties and ionic conductivities of the membranes. The membrane sample with LiBOB composition of 25% produced the highest mechanical properties with tensile strength of 21.11 MPa and elastic modulus of 1.93 MPa. The membrane sample with LiBOB composition of 10% without the addition of HMII produced the highest ionic conductivity, namely 5.17 x 10-6 S/cm. BRIN Publishing (Penerbit BRIN) 2025-04-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5011 10.55981/jsmi.2025.5011 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 112-121 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/5011/8379 Copyright (c) 2025 Rudi Satya Handika, Christin Rina Ratri, Rohib Rohib, Adam Febriyanto Nugraha https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5031 2026-11-02T08:00:37Z jsmi:ART

SODIUM LAURETH SULFATE (SLS) DECORATED α-PBO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES Tikarahayu Putri Iwan Syahjoko Saputra Anjar Hermadi Saputro Yogi Nopiandi Permana Yoki Yulizar Sudirman Sudirman Decorated Surfactant PbO Nanotechnology SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES. The α-PbO nanocrystals were successfully decorated using sodium laureth sulfate (SLS) anionic surfactant. The method used is one-pot synthesis approach. The precursor used is lead nitrate (Pb(NO3)2). The UV-Vis spectrophotometer showed the absorption peak of α-PbO nanocrystals was seen at wavelength of 237 nm and an absorbance value of 0.7. The optical properties of PbO nanocrystals can be seen at the bandgap value of 4.2 eV. FT-IR spectroscopy showed the shift of absorption peak at the wavenumber of 1358 cm-1. XRD spectroscopy showed the crystals of PbO at diffraction angles (2θ) of 10-80o: 29.17, 32.54, 37.85, 39.62, 45.16, 46.21, 56.12, and 61.73 with miller indices of (111), (200), (201), (121), (220), (030), (311), and (032), respectively. The crystal size average of PbO was 56.32 nm. The results of PSA and PZC shows the particle size distribution of PbO is 71.5 nm with inter-particle charge of -25 mV. SEM-EDX data shows the PbO nanocrystals have an irregularly spherical with a compounds composition of Pb (83.12%) and O (16.88%). From the data of characterization, it can be concluded the PbO nanocrystals was successfully decorated using the surfactant anionic of sodium laureth sulfate. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5031 10.17146/jsmi.2021.22.3.6209 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 71-76 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5031/3702 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5033 2026-11-02T08:00:37Z jsmi:ART

PICKERING EMULSION TECHNOLOGY IN FABRICATE CELLULOSE FOAM FROM OIL PALM EMPTY FRUIT BUNCH WASTE Putri Amanda Syarifah Nabila Ismadi Ismadi Deni Purnomo Nanang Masruchin Cellulose Foam Pickering Emulsion Oil Palm Empty Fruit Bunch Foamability PICKERING EMULSION TECHNOLOGY IN FABRICATE CELLULOSE FOAM FROM OILPALM EMPTY FRUIT BUNCH WASTE. Cellulose from the oil palm empty fruit bunch (OPEFB) waste can make a porous material. This study aims to make cellulose foam with Pickering emulsion technology used cellulose nanofiber as a Pickering agent. The mechanism of Pickering emulsion is learned from foamability and stability of foam in the presence of various concentrations of surfactant. The result showed that using Pickering emulsion technology only needed surfactant with a small concentration to improve foamability and stability. The addition of CNF indeed improved the stability and foamability with the Pickering effect. The stability test shows that the foam stabilized with CNF appeared to be relatively stable. In contrast to the CNF free system, the foams were collapse in three days tested. Structures of foam was characterized using an optical microscope and showed that the foam was composed into two- or three dimensional microstructures formed by gas bubble of wet foam in random orientations. This process generated the lightweight Cellulose foam from OPEFB waste, with a density of 0.07 g/cm3. Using Pickering emulsion technology to make cellulose foam can be one way to overcome OPEFB waste and this foam is potential for various applications. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5033 10.17146/jsmi.2021.22.3.6255 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 77-84 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5033/3703 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5037 2026-11-02T08:00:37Z jsmi:ART

SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION Sri Mulyati Latifah Djoko Hadi Prajitno Muhammad Fadhil Syukron Polymer Matrix Composite Radar Absorber Coating FeNdB Coercivity Reflection Loss SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION. Radar (Radio Detection and Ranging) is a technology using the principle of electromagnetic for detecting, measuring, and mapping target coordinates. So stealth technology was created to tackle these threats, one of which is the radar absorber coating method (RAC). This research aims to identify the effect addition of Cu to Fe-Nd-B radar absorber material as polymer matrix composite (PMC). The processes were done by powder metallurgy method, started by milling and mechanical alloying process using planetary ball mill for 60 minutes 1000 rpm, 25 kg/mm2 of compaction load, and sintering at the temperature 1000 oC for 3 hours. The coating process was carried out conventional method as much as 1 layer, the variation of resin and magnetic powder are (95:5), (90:10), and (85:5) with the addition of Cu 1%wt. Based on the characterization the lowest RL was obtained at the composition (85:15) with the value 32.08 dB at the frequency of 10.36 GHz, magnetic characterization after doping addition coercivity 0.096 kOe and Saturation 5.22 kG. PMC hardness was raising following to addition of magnetic powder with the 29.2 HD Shore D, and adhesivity value was decreased following to addition of magnetic powder to 0.5 MPa. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5037 10.17146/jsmi.2021.22.3.6269 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 85-92 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5037/3704 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5043 2026-11-02T08:00:37Z jsmi:ART

CHARACTERIZATION OF GOLD NANOPARTICLES FROM CLOVE FLOWER WATER EXTRACT AND ITS ANTIOXIDANT ACTIVITY Gusti Ayu Dewi Lestari Kadek Duwi Cahyadi Iryanti Eka Suprihatin Green Synthesis Gold Nanoparticles Antioxidant Syzygium Aromaticum (L.) CHARACTERIZATION OF GOLD NANOPARTICLES FROM CLOVE FLOWER WATER EXTRACT AND ITS ANTIOXIDANT ACTIVITY. Green chemistry is a safe and cost effective method for producing metal nanoparticles, characterize and tested the antioxidant activity of gold nanoparticles (AuNPs). In this research gold nanoparticles were synthesized using HAuCl₄ as the gold precursor and water extract of Syzygium aromaticum (L.) flowers 0.5% as the bioreductor. Characterization of the gold nanoparticles was carried out using UV-Vis spectrophotometer to measure the maximum wavelength, zeta analyzer to determine the particle size, and SEM EDS to investigate the morphology and content of the gold nanoparticles. The antioxidant activity was determined by measuring its free radical scavenging activity using the DPPH method. The research found the AuNPs has a maximum wavelength at 533 nm, and particle size of 73.52 nm. Furthermore, the AuNPs show free radical scavenging activities of up to 70%. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5043 10.17146/jsmi.2021.22.3.6292 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 93-100 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5043/3705 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5047 2026-11-02T08:00:37Z jsmi:ART

SYNTHESIS AND CHARACTERIZATION: COMPOSITE OF GRAPHENE OXIDE BASED PALM KERNEL SHELL WASTE WITH Fe3O4 Bernadeta Ayu Widyaningrum Dita Apriani Putri Amanda Ismadi Ismadi Sutanto Sutanto Palm Kernel Shell Hummer Method Graphene Oxide GO-Fe3O4 Composite Co-Precipitation SYNTHESIS AND CHARACTERIZATION: COMPOSITE OF GRAPHENE OXIDE BASEDPALM KERNEL SHELL WASTE WITH Fe3O4. In this study, GO-Fe3O4 were fabricated by co-precipitationtechnique and the graphene oxide (GO) were synthesized from an agricultural biomass, palm kernel shell, viaHummer’s method. Field Emission Scanning Electron Microscopy and Energy Dispersive Spectrum(FESEM-EDS), Fourier Transform Infra-Red (FT-IR) spectroscopy, X-Ray Diffractometer (XRD), and Ramanspectroscopy were used to analysis the successful attachment of Fe3O4 onto the surface of GO. Morphologyobservation showed that Fe3O4 were heterogeneously deposited on the surface of GO. FT-IR spectra showspeak that incorporated to oxygenated functional groups and sharp peak at 586 cm-1 confirmed to latticeabsorption of Fe3O4. The percentage of composition of GO-Fe3O4was characterized by energy dispersivespectroscopy and the results also confirmed in XRD exhibits similar properties with JCPDS 19-0629 formagnetite more dominant than GO. From Raman spectroscopy analysis shows that 1343.82cm-1 (D-band) and 1584.62 cm-1 (G-band) and 2698 cm-1 (2D-band) indicates GO and GO-Fe3O4 were successfullysynthesized. BRIN Publishing (Penerbit BRIN) 2021-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5047 10.17146/jsmi.2021.22.3.6310 Jurnal Sains Materi Indonesia; Vol. 22 No. 2 (2021); 101-109 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5047/3706 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5058 2026-11-02T07:51:59Z jsmi:ART

EFFECT OF TREATMENT SOLUTION ON THE MICROSTRUCTURE AND MICROHARDNESS OF TERNARY Ni-Al-Nb ALLOY DOPED WITH TITANIUM Hikmat Nugraha Pradoto Ambardi Djoko Hadi Prajitno Ni base supperalloy Ni-Al-Nb Aging Effects of Titanium element EFFECT OF TREATMENT SOLUTION ON THE MICROSTRUCTURE AND MICROHARDNES OF TERNARY Ni-Al-Nb ALLOY DOPED WITH TITANIUM. Nickel-based superalloys have been widely used in various applications, which require high strength at high temperatures. Most types of these superalloys is age-hardenable because they have γ’ particles' chemical composition Ni3(Al, Ti) in γ’-phase matrix. This research will be used alloy Ni-Al-Nb added alloying elements Ti. This research was conducted to study the mechanical properties, microstructure conditions in some alloys Ni-Al-Nb added distinction Titanium element (0,5% and 1% Ti) using the method of aging temperature variation performed at a temperature of 650 °C,700 °C and 750 °C with a holding time 4 hours and air cooling. Tests were conducted to determine the characterization of the specimen includes testing metallographic optical microscope, Rockwell hardness C and SEM- EDS,XRD. Results obtained from this research that addition of titanium element affecting the hardness values as well as the results of the cast, solution treatment and aging process results. The 1% Titanium content can affect the gamma prime coarsening and make the grain on the microstructure result smooth. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5058 10.17146/jsmi.2020.22.1.5526 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 1-7 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5058/3708 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5059 2026-11-02T07:51:59Z jsmi:ART

THE EFFECT OF REVERSE FLOTATION METHOD ON SILICA SAND AS WATERPROOFING MORTAR Okky Putri Prastuti Ayu Tri Septianingrum Elisya Dianty Fatmala Ufafa Anggarini Tri Eddy Susanto Nuvixca Dewi Milangsari( Mortar Reverse Flotation Silica Sand Tailings Waterproof THE EFFECT OF REVERSE FLOTATION METHOD ON SILICA SAND AS WATERPROOFING MORTAR. Waterproof fabrication mortar cement by silica sand using reverse flotation silica (RFS) method was evaluated by waterproof absorption coefficient, compressive strength test, attractive test, and contact angle. RFS is used to replace waterproof agent and aggregate mortar to reduce cost. The aims of this experiment are to know the RFS process, the ratio between waterproof mortar cement with RFS and mortar, to determine performance and characteristic waterproof mortar cement. Methods used are prepared RFS, mortar cement fabrication, and testing (compressive strength, tensile strength, permeability, contact angle, XRF, FTIR, SEM, BET). Variable used are ratio cement/silica sand, concentrations of CaCl2, curing time, oleic acid, and sodium oleate addition. Optimum collector addition is obtained by oleic acid with compress strength 167.65 kg/cm2, tensile strength 0.16 MPa, permeability 4.6 cm, and contact angle 95°. Curing inside water effect and outside temperature give compress strength 167.65 kg/cm2 and 163.24 kg/cm2, permeability curing inside the water and outside temperature are 4.6 cm and 12 cm. Optimum CaCl2 addition is gained at CaCl2 1.8M with compress strength 64.29 kg/cm2, tensile strength 0.15 MPa, permeability 2.4 cm, contact angle 95°. Optimum ratio cement/RFS is 1:1 with compress strength 167.65 kg/cm2, tensile strength 0.16 MPa, permeability 4.6 cm, and contact angle 950. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5059 10.17146/jsmi.2020.22.1.5991 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 8-15 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5059/3709 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5067 2026-11-02T07:51:59Z jsmi:ART

THE EFFECT OF CALCINATION TEMPERATURE TO THE COMPOSITE CHARACTERISTICS OF TiO2SiO2 NANOPARTICLE Della Dwi Ananda Dina Kartika Maharani TiO2SiO2 nanoparticles sol- gel calcination temperature self cleaning THE EFFECT OF CALCINATION TEMPERATURE TO THE COMPOSITECHARACTERISTICS OF TiO2SiO2 NANOPARTICLE. Self-cleaning material is a material that utilizes the photocatalytic property to degrade organic and inorganic compounds with the help of UV light. One of the materials that have good photocatalytic property is TiO2, the photocatalytic property causes TiO2 to be amphiphilic: becomes hydrophilic when there is light and becomes hydrophobic when there is no light. The photocatalytic property of TiO2 can be improved with the addition of buffer material such as SiO2. TiO2SiO2 nanoparticle was synthesized using a sol-gel method with Titanium (IV) Isopropoxide (TTIP) precursors for TiO2 and Tetraethyl Orthosilicate (TEOS) precursors for SiO2 and followed by a variation of calcination temperature of 400 °C, 450 °C, 500 °C, and 550 °C for 2 hours. TiO2SiO2 composite was synthesized using composition TiO2 sol 75% and SiO2 25%. The result of the synthesis TiO2SiO2 composite was characterized by Fourier Transform Infra-Red (FT-IR) instrument to determine the functional groups in the composites and X-Ray Diffraction (XRD) instruments to determine the phase, crystallite size and degree of crystallinity in the composite. The purpose of this research is to synthesized TiO2SiO2 nanoparticle as a self cleaning agent with variation of the calcination temperature, to obtain composite characteristics that can support self cleaning. The self-cleaning ability was based on a produced composite characteristic of TiO2SiO2. The result of FTIR characterization showed that at calcination temperature of 400 °C, 450 °C, 500 °C, and 550 °C there was a Ti-OSi bond at the peak of 948.91 cm-1, 950.77 cm-1, 941.13 cm-1, 942.13 cm-1. The result of XRD characterization showed that at the temperature of 400 °C had the best characteristics, the 75.27% anatase phase and brookite phase 24.72%. Calcinations temperature 400 °C had best degree of crystallinity of 91.66%. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5067 10.17146/jsmi.2020.22.1.6020 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 16-24 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5067/3715 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5068 2026-11-02T07:51:59Z jsmi:ART

EFFECT OF 5 WT.% WPCB POWDER AS REDUCTANT ON INDONESIAN NICKELIFEROUS ORE PROCESSING Reza Miftahul Ulum Dimas Ananda Radhitya Alfian Ferdiansyah Madsuha Faizinal Abidin Electronic waste WPCB nickel ore processing EFFECT OF 5 WT.% WPCB POWDER AS REDUCTANT ON INDONESIAN LIMONITICNICKEL ORE PROCESSING. Waste printed circuit boards (WPCB) are among the most valuable parts of electronic waste with one of the fastest-growing waste streams in the world. The purpose of this study is to investigate the possibility of WPCB powder as an alternative reducing agent for the carbothermic process in nickel lateritic ore processing. WPCB waste was mixed with nickel ore at 1100ÚC in inert atmosphere. In addition, a conventional reductant of coal is also utilized for comparison. Both reductant are varied in concentration of 5 wt% and 15 wt%. Based on thermogravimetric analysis (TGA) and differential thermogravimetric analysis (DTA) investigation, it is observed that there exists a difference between WPCB powder, nickeliferous ore powder, and the mixture in their decomposed levels. The decomposed gasses of WPCB produced by thermal degradation in the TGA instrument are mainly composed of reduction gas, which plays a critical role in reducing the nickeliferous ore. This study shows that WPCB powder performs comparably to sub-bituminous coal in the pyrometallurgical processing of nickel ore, which is proved by X-Ray Diffraction (XRD) test results that the carbothermic products consists of FeNi, magnetite, wustite and fayalite. It can be concluded than WPCB powder has potential to be utilize as an alternative reductant. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5068 10.17146/jsmi.2020.22.1.6052 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 25-31 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5068/3716 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5073 2026-11-02T07:51:59Z jsmi:ART

AUTOCLAVE-ASSISTED DEACETYLATION: A RAPID METHOD TO RECYCLING CIGARETTE BUTTS INTO CELLULOSE Putri Amanda Anisyah Putri Nanang Masruchin Wida Banar Kusumaningrum Riska Surya Ningrum Ismadi Ismadi Cigarette Butts Cellulose Acetate Cellulose Deacetylation Autoclave AUTOCLAVE-ASSISTED DEACETYLATION: A RAPID METHOD TO RECYCLINGCIGARETTE BUTTS INTO CELLULOSE. Cellulose acetate (CA)-based materials, like cigarette butts (CBs), become one of the most com-mon types of litter in the world. The toxic substances that are contained make this waste carry a hazardous risk for the environment and living organisms. Herein we report a rapid method for recycling cigarettes butts into more environmen-tally material. Cellulose was fabricated by deacetylation of cigarette butts with NaOH solution at various times 15, 30, 45, and 60 minutes in autoclave. Cellulose was optimized by a degree of deacetylation (DD%) and was further charac-terized by FTIR, SEM, TGA, and DSC analysis. The DD% and FTIR results confirmed the complete conversion of cellu-lose acetate from cigarette butts to cellulose within 15 minutes. Cellulose morphology under SEM showed the surface became rougher and textured after autoclave treatment. The results of autoclave-assisted deacetylation are comparable with the conventional deacetylation. Our rapid method offers substantially reduced deacetylation from 24 hours to just 15 minutes. This study has shown that the new and straightforward method for deacetylation cellulose acetate and it is potential as an alternative method for recycling cigarette butts waste in the future. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5073 10.17146/jsmi.2020.22.1.6066 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 32-38 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5073/3718 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5239 2026-11-02T07:51:59Z jsmi:ART

EFFECT OF AGAR AND KAPPA-CARRAGEENAN ON THERMAL AND MECHANICAL PROPERTIES OF THERMO PLASTIC STARCH (TPS) Akbar Hanif Dawam Abdullah Putri Putih Puspa Asri Rossy Choerun Nissa Dina Fransiska Nurhayati Nurhayati Agusman Agusman Hari Eko Irianto Panji Priambudi Sri Marliah Starch Agar kappa-Carrageenan Bioplastics Effect of Agar and kappa-Carrageenan on Thermal and Mechanical Properties of Thermo Plastic Starch (TPS) Thermoplastic starch needs to be blend with other materials because of its limited properties. In order to gain the desired properties, the interaction between the added component (filler, plasticizer, second polymer, etc) must be concerned as it can affect the performances of the final product. Thermoplastic starch has been successfully made with mixing and compression molding with the addition of agar and kappa-carrageenan. The effect of the added material has been studied with FTIR, Tensile, DSC, and TGA to investigate their mechanical and thermal properties. The FTIR spectrum has shown the shifting around the methyl group (C-H), a carboxyl group (C-O), and a hydroxyl group (O-H). Thermal analysis results presented different patterns in melting and degradation behavior. The tensile strength value did not show significant improvement with the presence of agar and kappa-carrageenan. It is shown that the addition of agar and kappa-carrageenan affects thermal behavior but does not significantly impact the mechanical properties.  BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5239 10.17146/jsmi.2020.22.1.6072 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 39-44 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5239/3852 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5240 2026-11-02T07:51:59Z jsmi:ART

SANS STUDIES ON THE BOVINE SERUM ALBUMIN DENATURATION IN THE PRESENCE OF SDS Dwi Rahayu Arum Patriati Nadi Suparno Edy Giri Rachman Putra BSA SDS Denaturation SANS The effect of the presence of sodium dodecyl sulfate (SDS) on the denaturation of bovine serum albumin (BSA) has been studied using 36 m small-angle neutron scattering (SANS) BATAN spectrometer (SMARTer). The neutron scattering data reduction used the Graphical Reduction and Analysis SANS Program (GRASP) software, and the fitting process used the IGOR SANS Analysis software. The denaturation process was identified by observing the changes BSA globular structure. The experimental results showed the addition of SDS at low concentrations (2 mM, 5 mM, 10 mM) into BSA solution at pH 7 do not cause a significant change in the size of the BSA globular structure. The SANS scattering profile of BSA fitted with the triaxial ellipsoid model, a simple shape approach for protein globular structure. The fitting result showed the semi-axis B for BSA in the addition of 2 mM, 5 mM, 10 mM SDS were 33.8 Å, 33.8 Å, and 37.8 Å, respectively. While the semi-axis A and semi-axis C were constant for those three variations at 14.6 Å and 32.2 Å, respectively. In higher addition of SDS, the globular structure of BSA unfolded into flexible cylinder structure with the radius of 14.4 Å and length of 83.5 Å. The denaturation of BSA was clearly showed by the addition of 40 mM SDS. The structure of BSA in this condition fitted to fractal structure with fractal dimension of 1.1, the block radius of 16.7 Å and the correlation length of 42.5 Å. These results indicated that the addition of SDS at low concentrations has not caused the denaturation of BSA. Meanwhile, the addition of SDS at high concentrations made BSA to unfold that lead to the denaturation of BSA. BRIN Publishing (Penerbit BRIN) 2020-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5240 10.17146/jsmi.2020.22.1.6134 Jurnal Sains Materi Indonesia; Vol. 22 No. 1 (2020); 45-50 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5240/3857 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5250 2026-11-02T07:36:15Z jsmi:ART

RADIATION SYNTHESIS OF POLY(VINYL ALCOHOL) PVA–(POLYVINYL PYRROLIDONE) PVP FOR IMMOBILIZATION OF CAPTOPRIL Hariyanti Hariyanti Erizal Erizal M Yasin Yunus Indah Lestari Ditri Risska Rahmadhani PVA PVP Hydrogel Captopril Irradiation RADIATION SYNTHESIS OF PVA POLY(VINYL ALCOHOL)–PVP (POLYVINYLPYRROLIDONE) for IMMOBILIZATION OF CAPTOPRIL. The aim of this work is to prepare Polyvinyl alcohol (PVA)- Polyvinylpyrrolidone (PVP) hydrogel with varying irradiation doses and drug dose to be used as a matrix for immobilization and control drug release of captopril. Immobilization and release of captopril in PVA-PVP hydrogel copolymer have been carried out. A mixture of PVA-PVP (6:4 w/w) solution containing captopril (10-20 mg), freeze-thawing, irradiated using gamma rays at various irradiation doses (0-20 kGy). The gel fraction and water absorption were determined gravimetrically. The pores structure of hydrogels were observed using SEM (Scanning Electron Microscope). The captopril released from hydrogel in NaCl 0.9% solution was measured using a UV-Vis spectrophotometer. After evaluated, it was found that with increasing dose up to 20 kGy, the gel fraction increases, and water absorption decreases, and the cumulative drug released decreases. SEM measurement showed that hydrogel had heterogeneous pores. PVA-PVP hydrogel prepared using gamma rays can be considered as a matrix for drug release. BRIN Publishing (Penerbit BRIN) 2020-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5250 10.17146/jsmi.2020.21.4.6468 Jurnal Sains Materi Indonesia; Vol. 21 No. 4 (2020); 143-150 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5250/3860 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5251 2026-11-02T07:36:15Z jsmi:ART

EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS. Marzuki Silalahi Bernardus Bandriyana Harum Andriadi Bayu Bambang Sugeng Rohmad Salam ODS steel Ultrasonic Ytria powder metallurgy sintering microhardness EFFECT OF ULTRASONIC TREATMENT ON THE CONSOLIDATION OF ODS STEEL FeCrY2O3 PROCESSING WITH CAPSULATED SINTERING PROCESS. A new method on the synthesis of ODS (Oxide Dispersion Strengthened) steel for advanced nuclear material was performed by ultrasonic treatment to improve the consolidation process. The raw material of Fe, Cr and Y2O3powder with the composition of Fe-15 wt% Cr, 0.5 wt% and Ytria (Y2O3)  as disperzoid were  processed by the powder metallurgy method with the main process of pre-alloying, iso-compaction and sintering process. The pre-alloying process was carried out by mixing the alloying elements using ultrasonically treatment at frquency of 20 kHz with variation of  40, 50 and 60 % amplitude. Iso-compaction process was done using the load of  800 psi to obtain a pellet-shaped sample, then continued by the sintering process for consolidation. The sintering process was done in two stages, 1-step sintering and 2-steps sintering, using the heating furnace by putting the sample in a quartz capsule to prevent oxidation attack. Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS), X-ray Diffraction (XRD), and Micro-hardness tests were carried out to analyze the microstructure and phase formation in relation to the consolidation process. The highest hardness occurred in the addition of treatment with an amplitude of 60% which produces a micro structure with the most fine grain. For 1-step sintering process, the highest hardness of 134.51 VHN obtained at 40 % amplitude. The hardness of the alloy depends on the size of the grain boundary associated with the difficulty of the dislocation movement. BRIN Publishing (Penerbit BRIN) 2020-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5251 10.17146/jsmi.2020.21.4.5969 Jurnal Sains Materi Indonesia; Vol. 21 No. 4 (2020); 151-157 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5251/3861 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5803 2026-10-30T04:25:58Z jsmi:ART

PENGARUH LAKU PASIF PADA PERTUMBUHAN KOROSI SUMUR BAJA KARBON DALAM LARUTAN PEKAT LiBr YANG MENGANDUNG LiOH DAN LiNO3 Harsisto Korosi sumur Korosi Baja karbon LiBr PENGARUH LAKU PASIF PADA PERTUMBUHAN KOROSI SUMUR BAJA KARBON DALAM LARUTAN PEKAT LiBr YANG MENGANDUNG LiOH DAN LiNO3. Pada hasil penelitian terdahulu menunjukkan bahwa timbulnya korosi sumur karena potensial korosi alami yang terjadi melampaui harga potensial kritis untuk terjadinya korosi sumur. Penelitian ini dimaksudkan untuk memperdalam pengamatan pengaruh laku pasif pada permukaan bebas baja karbon (luas 5,0 dan 30,0 cm2) yang dicelup dalam larutan uji 60% LiBr + 0,2% LiOH + 0,2% LiNO3 terhadap pertumbuhan korosi sumur. Menurut hasil percoban laku pasif pada kisaran potensial katodik —900 hingga —700 (mV vs SCE) dengan waktu penahanan 1 jam, diperoleh harga potensial spontan maksimum (Esp,mAx) pada-750 mV dengan kedalaman korosi sumur 8 mm. Penelitian lebih lanjut pada laku pasif —750 mV dengan variabel waktu penahanan 1 hingga 100 jam menunjukkan bahwa semakin lama waktu penahanan semakin tinggi harga ESP maupun kedalaman korosi sumur yang dicapai. Hal ini dapat dilihat dari hasil penahanan selama 100 jam, diperoleh harga EsP sebesar 0 mV dengan kedalaman korosi sumur 40 um BRIN Publishing (Penerbit BRIN) 2000-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5803 10.17146/jusami.2000.1.2.5321 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 5-9 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5803/4248 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5815 2026-10-30T04:54:12Z jsmi:ART

MATERIAL MAGNETIK BARIUM HEKSAFERIT TIPE-M UNTUK MATERIAL ANTI RADAR PADA FREKUENSI S-BAND Priyono Manaf, Azwar Material anti radar Barium heksaferit tipe-M Ukuran butir Frekuensi S-band MATERIAL MAGNETIK BARIUM HEKSA FERITTIPE-M UNTUK MATERIAL ANTI RADAR PADA FREKUENSI S-BAND.Dalam makalah ini dibahas preparasi dan evaluasi karakteristik senyawa material penyerap (absorber) gelombang mikro dengan komposisi BaFe12-2x MnxTixO19 (x = 0,0 hingga 1,5) yang diperoleh melalui proses subsitusi senyawa dasar barium heksaferit (BaO.6Fe2O3) melalui alur pemaduan mekanik (mechanical alloying). Pembentukan fasa material penyerap diawali dengan substitusi ion Mn dan ion Ti terhadap ion Fe dalam komponen material Fe2O3 pada suhu 1.300 oC. Material hasil substitusi dipadukan secara mekanik dengan komponen BaCO3 untuk membentuk fasa heksaferit tipe-M setelah reaksi padat. Identifikasi puncak difraksi sinar-X dari material hasil pemaduan mekanik ini menunjukkan secara meyakinkan bahwa telah terbentuk material fasa tunggal BaFe12-2x MnxTixO19. Evaluasi material mencakup ukuran rata-rata butir dan karakteristik serapan gelombang mikro pada rentang frekuensi 1 GHz hingga 6 GHz. Hasil evaluasi menunjukkan bahwa terjadi serapan gelombang pada frekuensi ~ 2.000MHz dan ~ 3.500MHz dengan koefisien refleksi yang relatif tinggi pada rentang frekuensi yang tersedia. Keberadaan ion Mn dan ion Ti mampu memperlebar frekuensi serapan terutama pada daerah 3.500 MHz. BRIN Publishing (Penerbit BRIN) 2010-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5815 10.17146/jusami.2010.11.2.4576 Jurnal Sains Materi Indonesia; Vol. 11 No. 2 (2010): Jurnal Sains dan Materi Indonesia; 75-78 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5815/4254 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5817 2026-10-30T04:54:12Z jsmi:ART

FABRICATION OF UNGLAZED CERAMIC TILE USING DENSE STRUCTURED SAGO WASTE AND CLAY COMPOSITE Aripin Tani, S. Mitsudo, S. Saito, T. Idehara, T. Sago waste and clay composite Ceramic tile Water absorption Density FABRICATION OF UNGLAZED CERAMIC TILE USING DENSE STRUCTURED SAGO WASTE AND CLAY COMPOSITE. In Indonesia, the sago processing industry generates every year huge amount of sago waste, and converting this waste into a useful material is possible. In the present study, physical properties of dense structured sago waste and clay composite were investigated in order to study the feasibility of reuse this sample as raw material in the producing of ceramics. Firstly, the chemical composition of ash (obtained from the sago waste) and clay was characterized. The prepared sample was sintered at the temperature range from 800 to 1,200 oC using electric furnace. The density, linear shrinkage and water absorption of the sintered sample were determined by using the Archimedes' method. The experimental result indicated that the density of the sintered sample increased with increasing sintering temperature up to 1100oC and then slightly decreased afterward. The water absorption of the products decreased with an increase in sintering temperature. In the sintered sample at 1,100 oC, the water absorption decreased rapidly and water adsorption of less than 1% was achieved. This water absorption was less than 5% which was needed for unglazed floor tile. The result of water adsorption suggest that it is possible to use this sample as a raw material for producing the ceramic floor tile. BRIN Publishing (Penerbit BRIN) 2010-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5817 10.17146/jusami.2010.11.2.4580 Jurnal Sains Materi Indonesia; Vol. 11 No. 2 (2010): Jurnal Sains dan Materi Indonesia; 79-82 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5817/4256 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5819 2026-10-30T04:26:55Z jsmi:ART

PREPARASI DAN KARAKTERISASI KALSIUM FERIT DARI KERAMIK BIOGELAS MENGGUNAKAN SIMULATED BODY FLUID (SBF) RINGER UNTUK APLIKASI IDENTIFIKASI SEL KANKER Sunendar, Bambang Hermawan, Irwan Taufik Keramik biogelas aktif Calcium ferrite Hyperthermia Apatite PREPARASI DAN KARAKTERISASI KALSIUM FERIT DARI KERAMIK BIOGELAS MENGGUNAKAN SIMULATED BODY FLUID(SBF) RINGER UNTUK APLIKASI IDENTIFIKASI SEL KANKER. Adanya kebutuhan akan penyembuhan penyakit yang lebih baik dan lebih cepat telah meningkatkan kebutuhan teknologi biomaterial terutama biomedis khususnya pada terapi kanker. Penggunaan biomaterial di dalamtubuh sangat berguna untukmemperbaiki kualitas hidupmanusia sekaligusmenyelamatkan nyawa banyak orang tiap tahunnya. Pertumbuhan sel kanker sangat cepat dan mudah menempel di jaringan tubuh karena sifat hidrofiliknya sehingga perlumengidentifikasi sel kanker lebih cepat dan selanjutnya dilakukan terapi untukmemusnahkannya. Penelitian ini bertujuanmelihat terbentuknya senyawa Calciumferrite (CaFe4O7) dan hematite (α-Fe2O3)serta tingkat kompatibilitas keramik biogelas di dalamtubuh. Calciumferrite (CaFe4O7) adalah senyawa yang fasanya menyerupai tulang sehingga sangat mungkin untuk digunakan sebagai bahan dalamperbaikan tulang. Sedangkan hematite (α-Fe2O3)digunakan sebagai biogelas aktif yang berfungsi sebagai bahan magnetik yang tidak stabil untuk mendeteksi adanya sel kanker yang juga bersifat tidak stabil. Karakter morfologi strukturmikro apatite di permukaan diinvestigasi dengan XRDdan SEM untuk mengetahui bioaktivitas dari keramik biogelas sebelum diaplikasikan dalam identifikasi sel kanker. BRIN Publishing (Penerbit BRIN) 2008-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5819 10.17146/jusami.2008.10.1.4559 Jurnal Sains Materi Indonesia; Vol. 10 No. 1 (2008): Jurnal Sains dan Materi Indonesia; 1-6 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5819/4261 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5820 2026-11-02T06:39:32Z jsmi:ART

Magnetic Force Microscope Image Evaluation of Magnetic Iron Oxide Floppy Disc with Various Lift Heights Nanda Shabrina Mardiyanto Abu Khalid Rivai Atomic Force Microscope Non-contact mode Topography One of the advantages of Scanning Probe Microscopes (SPM) or better known as the Atomic Force Microscope (AFM) is its ability to "see" in detail at the level of atoms and molecules, so as to improve understanding of how a system works and leads to new discoveries in areas such as life science, materials science, electrochemistry, polymer science, biophysics, nanotechnology and biotechnology. To understand about the MFM mode, amplitude, phase and topographic image, a piece of a flop-py disk as references sample was used in various lift heights. In this paper presented the principles of AFM work and explain the necessary components of such equipment. The MFM images were taken in floating operation method at different heights namely 30, 40 and 60 nm between the surface sample and Co-Cr cantilever tip. Result showed the distance between the cantilever tip to the sample surface influenced the image quality. The best amplitude image could be taken in 60 nm distance. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5820 10.17146/jsmi.2020.21.3.5773 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 97-101 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5820/4258 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5822 2026-11-02T06:39:32Z jsmi:ART

PERFORMANCE STUDY OF LiBOB/LiTFSI ELECTROLYTE SALT IN THE ALL-SOLIDSTATE LITHIUM-ION BATTERY Christin Ratri Titik Lestariningsih Qolby Sabrina LiBOB li-ion battery PVdF polymer electrolyte  Solid polymer electrolyte is developed mainly to provide safer lithiumion battery upon high temperature operation. In this research, we employ LiBOB and LiTFSI electrolyte salt in various concentration to replace commercially used LiPF6 salt. Solution cast method was performed to produce polymer electrolyte membrane. PVdF-HFP was chosen as polymer matrix due to high dielectric constant, and compatibility to wide array of electrode materials as well as electrolyte salts. Higher amount of electrolyte salts contributes to thicker membrane and hence higher current output of the lithium-ion battery half-cells. SEM, FT-IR spectroscopy, and cyclic voltammetry measurement was conducted to evaluate li-ion battery cell performance. Between the two electrolyte salts used in this experiment, LiTFSI salt exhibited better performance compared to LiBOB. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5822 10.17146/jsmi.2020.21.3.5895 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 102-108 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5822/4259 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5823 2026-11-02T06:39:32Z jsmi:ART

PREPARATION OF ACYCLOVIR-ISONICOTINAMIDE COCRYSTAL BY SOLVENT EVAPORATION METHOD WITH METHANOL AND ISOPROPANOL Agnes Nuniek Winantari Roisah Nawatila Cecilia Jocelyn Acyclovir Cocrystal Isonicotinamide Solvent Evaporation Acyclovir is a nucleoside synthetic analog antiviral group used in the treatment of Herpes simplex virus (HSV-1 & HSV-2) and Varicella zoster virus (VZV). Acyclovir has low water solubility, so it needs to be modified in the form of cocrystal with isonicotinamide. This study aims to obtain the physical characteristics produced by acyclovir-isonicotinamide cocrystal (1:1) made through the solvent evaporation method with methanol and isopropanol. The crystalline formed is characterized by DSC, PXRD, FT-IR and SEM. The characterization results showed the presence of new crystals that formed between acyclovir-isonicotinamide in methanol and isopropanol solvents. Thermograms showed sharp exothermic peaks at 183.31°C and 186.24°C. The diffractogram showed a new peak at 2θ = 5.19 and 5.82. The spectrum showed a shift in wavelength in the cocrystal formed. The cocrystal has a different morphology compared with parent drug and coformer on analysis using SEM. This research shows that acyclovir can form cocrystal with isonicotinamide by solvent evaporation method with methanol and isopropanol. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5823 10.17146/jsmi.2020.21.3.5897 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 109-114 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5823/4260 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5824 2026-11-02T06:39:32Z jsmi:ART

THE EFFECT OF ADSORBENT TYPE AND RATIO ON REMOVAL OF METHYLENE BLUE ANDITS ISOTHERM ADSORPTION Lia Cundari Eki Saputra Agus Suranto Yandriani Yandriani Rosalina Rosalina adsorption adsorbent type isotherm methylene blue ratio  Methylene Blue (MB) is one of the dye that are widely used in the textile industry. The wastewater from textile industry that contain MB can reduce the oxygen level in water bodies. This study aims to determine the efficiency of the adsorbent in MB removal and to analyze the isotherm adsorption. The variations conducted in this research was the type of adsorbent and its ratio. The activated carbon that used as adsorbent was fresh betel nut (Cyrtostachys lakka) activated carbon (A), regenerated betel nut activated carbon (B), and coconut shell activated carbon (Cocos nucifera) (C). The type of adsorbent was AB, AC, and BC with ratio of 1:1, 1:2, 1:3, 2:1, and 3:1. The MB concentration was analyzed by using UV-Vis spectrophotometer. Isotherm adsorption was calculated based on Freundlich and Langmuir. The best results showed that the combination of fresh and regenerated betel nuts (AB) with ratio of 3:1 can remove 97.77% of MB. The adsorption process of MB in aqueous solution followed the Langmuir model with regression over 0.99 and adsorption capacity in the range of 2.14 mg/g - 3.53 mg/g. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5824 10.17146/jsmi.2020.21.3.5900 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 115-121 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5824/4263 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5825 2026-10-30T04:26:55Z jsmi:ART

PENUMBUHAN FILM CdO DENGAN METODE CHEMICAL BATH DEPOSITION (CBD) Maddu, Akhiruddin Sirait, Johan D. Wahyudi, Setyanto Tri Film CdO Metode CBD Fasa Cd(OH)2 Fasa CdCO3 PENUMBUHAN FILM CdO DENGAN METODE CHEMICAL BATH DEPOSITION (CBD). Film CdO ditumbuhkan pada supstrat kaca dalam dua tahap, yaitu deposisi dengan metode Chemical Bath Deposition (CBD) dan dilanjutkan dengan pemanasan pada 250 oC dan 400 oC. Morfologi film CdO memperlihatkan bentuk bongkahan berukuran sekitar 1 μm, sedangkan ketebalan filmsekitar 1 μm berdasarkan hasil SEM. Hasil analisis XRD memperlihatkan bahwa fasa kristal mengalami transformasi akibat pemanasan. Film yang dipanaskan pada 250 oC didominasi oleh fasa CdCO3 dan pemanasan lanjutan pada 400 oC berubah fasa CdCO3 menjadi fasa CdO. Fasa kristal CdO memiliki struktur FCC dengan nilai parameter kisi yang diperoleh sebesar 4,70 Å. Nilai celah pita energi (Eg) ditentukan berdasarkan spektrum transmisi film CdO,diperoleh nilai Eg sebesar 2,1 eV untuk kedua film. BRIN Publishing (Penerbit BRIN) 2008-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5825 10.17146/jusami.2008.10.1.4569 Jurnal Sains Materi Indonesia; Vol. 10 No. 1 (2008): Jurnal Sains dan Materi Indonesia; 7-11 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5825/4262 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5826 2026-11-02T06:39:32Z jsmi:ART

THE UTILIZATION OF PET WASTE AS RAW MATERIAL FOR PRODUCING MONOFILAMENT YARN : THE EFFECT OF WINDING SPEED ON THE PHYSICAL AND MECHANICAL PROPERTIES OF THE YARN Abdurrohman Valentinus Galih Vidia Putra Akbar Hanif Dawam Abdullah plastic waste PET Melt spinning Monofilament yarn Plastic waste production in Indonesia is quite high, reaching 15% to the total national waste production or 189-kilo tons/day with an average growth of 14.7% per year, the second biggest contributor after organic waste. This fact greatly affects human health and the environment since plastic is difficult to degrade, estimated to require 100 to 500 years for the plastic to decompose completely. Therefore, recycling becomes a popular solution to reduce waste or plastic waste by turning it into new products that have added value. Plastic materials, such as PET, have thermoplastic properties which become a special potential to use as recycled materials. The aim of this research was to study the ability of PET plastic waste as a raw material for making monofilament yarn by melt-spinning methods. PET plastic waste is melted at 250-260 °C, then is extruded using a prototype melt-spinning tool with a single spinneret hole which the diameter is 3 mm into a monofilament yarn using three variations of winding speed (a) 43.33 m/min, (b) 59.35 m/min and (c) 72.72 m/min The results showed that the yarn with the highest winding speed (variation C) produced yarn with the highest fineness, reaching (30.06± 4.82) denier, and the best tensile strength compared with the other, reaching (47.7±14,97) MPa with elongation of of (10± 9.65) %. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5826 10.17146/jsmi.2020.21.3.5901 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 122-128 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5826/4265 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5827 2026-10-30T04:26:55Z jsmi:ART

ISOLASI DAN KARAKTERISASI MONTMORILLONITE DARI BENTONIT SUKABUMI (INDONESIA) Fisli, Adel Sumardjo Mujinem Montmorillonite Bentonit Proses sedimentasi ISOLASI DAN KARAKTERISASI MONTMORILLONITE DARI BENTONIT SUKABUMI(INDONESIA). Isolasi montmorillonite dari bentonit lokal tanpa menggunakan bahan kimia telah dilakukan. Proses isolasi meliputi; pelarutan dalam air, pemberian gelombang ultrasonik dan proses sedimentasi secara alami. Endapan yang terbentuk selama selang waktu tertentu dalamproses sedimentasi dikarakterisasi dengan XRD, XRF dan BET. Endapan: 0menit hingga 15 menit (fraksi 1) dan endapan 15 menit - 3 hari (fraksi 2) adalah fraksi kasar yang banyak mengandung mineral impuritas, seperti: clinoptilolite, quartz, illite, analcime dan dolomite. Sedangkan endapan 3 hari hingga 7 hari (fraksi 3) dan endapan >7 hari (fraksi 4) adalah fraksi halus yang mempunyai ukuran partikel 2,17 μm dan 0,75 μm, luas permukaan 77,26 m2/g dan 86,08 m2/g, ukuran pori 15.25 Å dan 15,01 Å dan volume pori 0,05891 mL/g dan 0,06460 mL/g. Disimpulkan bahwa fraksi 3 dan fraksi 4 adalah montmorillonite murni yang telah dapat diisolasi dari bentonit lokal. BRIN Publishing (Penerbit BRIN) 2008-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5827 10.17146/jusami.2008.10.1.4572 Jurnal Sains Materi Indonesia; Vol. 10 No. 1 (2008): Jurnal Sains dan Materi Indonesia; 12-17 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5827/4264 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5828 2026-10-30T04:26:55Z jsmi:ART

STUDI FOTODIODE FILMTIPIS SEMIKONDUKTOR Ba0,6Sr0,4TiO3DIDADAHTANTALUM Irzaman Fotodiode Semikonduktor BSTT Energi bandgap Konstanta dielektrik STUDI FOTODIODE FILMTIPIS SEMIKONDUKTOR Ba0,6Sr0,4TiO3 DIDADAH TANTALUM. Telah dilakukan penumbuhan film tipis Ba0,6Sr0,4TiO3 (BST) murni dan yang didadah tantalum pentoksida 5% (BSTT) di atas substrat silikon (100) tipe-p dan di atas substrat Transparant Conductive Oxyde (TCO) tipe-7056 menggunakan metode Chemical Solution Deposition (CSD) dan spin coating pada kecepatan putar 3000 rpm selama 30 detik. Film tipis di atas substrat silikon dipanaskan pada suhu 850 oC, 900 oC dan 950 oC,sedangkan film tipis di atas substrat TCO tipe-7059 dipanaskan pada suhu 400 oC, 450 oC dan 500 oC. Darihasil karaktrisasi ketebalan menunjukkan ketebalan meningkat dengan naiknya suhu pemanasan dari 400 oCsampai 500 oC sedangkan pada suhu pemanasan 850 oC sampai 950 oC ketebalan turun. Energy gap film tipis naik dengan naiknya suhu pemanasan dari 400 oC sampai 500 oC, tetapi dengan penambahan doping dapatmenurunkan energy gap film tipis. Nilai koduktivitas listrik film tipis BST dan BSTT berada pada rentang material semikonduktor. Konduktivitas listrik film tipis secara umum turun dengan naiknya suhu pemanasan.Doping tantalum yang diberikan, secara umum dapat menaikkan konduktivitas listrik film tipis. Nilai konduktivitas ini berubah terhadap perubahan intensitas cahaya yang jatuh pada film tipis. Dengan demikian film tipis ini bersifat fotokonduktiv. Konstanta dielektrik film tipis turun jika suhu pemanasan dinaikkan,namun doping tantalumdapat menaikkan konstanta dielektrik filmtipis. Dari hasil karakterisasi arus-tegangan didapatkan film tipis BSTT bersifat fotodiode. BRIN Publishing (Penerbit BRIN) 2008-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5828 10.17146/jusami.2008.10.1.4574 Jurnal Sains Materi Indonesia; Vol. 10 No. 1 (2008): Jurnal Sains dan Materi Indonesia; 18-22 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5828/4266 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5829 2026-11-02T06:39:32Z jsmi:ART

SIMULATION OF IRON CORROSION IN LEAD-MAGNESIUM EUTECTIC (LME) USING OXYGEN INHIBITOR Umi Sa’adah Artoto Arkundato Moh. Hasan corrosion in liquid metals molecular dynamics lead-magnesium alloys oxygen concentration Lead-magnesium (Pb-Mg) is a metal that considered to have potential as a coolant raw material in the heat transfer system of nuclear reactors. However, the coolant in the form of Pb-Mg eutectic is corrosive to structured materials (eg steel cladding) used in reactors. In this research, steel material is represented by pure iron to simplify the simulation and calculation. This research aims to determine the effect of temperature on iron corrosion and the effect of adding oxygen as an inhibitor to reduce the iron corrosion rate in LME. In this study, corrosion was observed by looking at (coefficient) the diffusion of iron atoms into LME. A large iron diffusion coefficient represents high iron corrosion. To see inhibition effectivity with oxygen, the most effective oxygen concentration that can reduce the iron diffusion coefficient is searched. Simulations of iron corrosion and inhibition are performed using molecular dynamics simulation. The result of this research showed that oxygen concentration mixed into LME for effective inhibition of iron corrosion was in the range of 0.125 wt% - 0.135 wt% (for temperatures of 973K). Thus, oxygen is believed that able to inhibit iron corrosion in Pb-Mg eutectic up to 98.44% BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5829 10.17146/jsmi.2020.21.3.5934 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 129-134 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5829/4268 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5830 2026-10-30T04:26:55Z jsmi:ART

EFEK PENAMBAHAN CuI TERHADAPREGANGANKISI DAN KONDUKTIVITAS BAHAN KONDUKTOR PADAT (CuI)x(AgI )1-x (x = 0,1 - 0,4) Purwanto, P. Purnama, S. Sukirman, E Alfian Bahan konduktor padat Regangan kisi Konduktivitas EFEK PENAMBAHAN CuI TERHADAPREGANGANKISI DAN KONDUKTIVITAS BAHAN KONDUKTOR PADAT (CuI)x(AgI )1-x (x = 0,1 - 0,4). Bahan konduktor padat (CuI)x(AgI)1-x dibuat dengan cara mencampurkan serbuk CuI dan AgI dengan perbandingan fraksi berat. Pengukuran konduktivitas (CuI)x(AgI)1-x dilakukan dengan alat LCR-meter pada frekuensi 0,1 Hz sampai 100 kHz. Regangan kisi konduktor padat (CuI)x(AgI )1-x naik seiring dengan penambahan CuI. Konduktivitas konduktor padat(CuI)x(AgI )1-x dengan fraksi berat x = 0,1 hingga 0,4menurun dengan naiknya fraksi berat CuI.Analisis struktur(CuI)x(AgI )1-x menunjukkan puncak-puncak difraksi yang muncul adalah puncak-puncak CuI. Lama waktu charge dan discharge berbeda, namun tegangan masih relatif stabil. BRIN Publishing (Penerbit BRIN) 2008-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5830 10.17146/jusami.2008.10.1.4578 Jurnal Sains Materi Indonesia; Vol. 10 No. 1 (2008): Jurnal Sains dan Materi Indonesia; 23-27 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5830/4267 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5831 2026-11-02T06:39:32Z jsmi:ART

EFFECT OF CRYSTALLINITY TO OVERPOTENTIAL ON Ni3Fe ALLOY AS ELECTROCATALYST IN HYDROGEN EVOLUTION REACTION Qonita Mu’minah Achmad Rochliadi Aep Patah Ni₃Fe alloy electrocatalyst HER overpotential electrodeposition Ni-Fe alloys can be used as electrocatalyst for the hydrogen evolution reaction (HER) in an alkaline solution. HER consumed highly energy and overpotential driven. The overpotential value corresponding to the electron transfer in reaction can be affected either by metal combination or alloy as a cathode. Ni₃Fe  alloy had been successfully synthesized by the electrodeposition method using direct-current (DC) on a 304 L type stainless steel substrate. The modified Watts bath deposition was used NiCl2·6H2O and FeCl3·6H2O as precursors of the alloy. The optimum conditions of the reaction were obtained at pH of the solution is 2.20±0.02 with 25 mA/cm² current density at 55 °C for 160 minutes. Ni₃Fe alloy was characterized by Powder X-ray Diffraction (PXRD), Energy-Dispersive X-ray Spectroscopy (EDX), and Scanning Electron Microscopy (SEM). The electrocatalytic property of Ni3Fe alloy was electrochemically measured in 1 M KOH solution by polarization method using a Tafel plot with a scanning rate of 1 mV/s. As a result, the mass ratio of Ni²+ /Fe³+ in bath deposition influenced the electrocatalytic property of Ni₃Fe alloy. Ni₃Fe alloy with a higher crystallinity lowered the overpotential value of HER up to 67% compared to Ni metal. BRIN Publishing (Penerbit BRIN) 2020-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5831 10.17146/jsmi.2020.21.3.5963 Jurnal Sains Materi Indonesia; Vol. 21 No. 3 (2020): Jurnal Sains dan Materi Indonesia; 135-140 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5831/4269 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5832 2026-11-02T02:47:23Z jsmi:ART

OPTIMATION OF RHENIUM-OXO-GLUCONATE SYNTHESIS AS A PRECURSOR FOR SYNTHESIS OF RHENIUM (V)-TETROFOSMIN Widyastuti A. H. Gunawan Sriyono Re-oxo-gluconate Rhenium-188 Synthesis Radiochemical purity Tetrofosmin Rhenium-188 or Rhenium-186 labeled compounds have been widely used as therapeutic radiopharmaceutical for cancer. Most of rhenium (Re) radiopharmaceuticals involve Re with oxidation state of 5, one of which is Re-dioxo-tetrofosmin. Complexes of Re(V)-ligand can be generated fromRe(V)-oxo-gluconate through ligand exchange process. Optimation of rhenium-oxo-gluconate synthesis was carried out by varying mole ratio of gluconate to perrhenate and reaction time, in which 188Re was added to perrhenate solution as radiotracer. Stability study of Re-oxo-gluconate at room temperature and elevating temperature was carried out bymeasuring its radiochemical puritywithin several hours. Radiochemical purity was analysed using 2 systems of paper chromatography with Whatman-3 paper as solid phase, and acetone and saline as mobile phases, respectively. Highest yield was obtained using mole ratio of 6000, i.e 87.43% (SD=3.01%), and the optimum reaction time was 1 hour. Storage at room temperature and elevating temperature resulted in the decrease of radiochemical purity of 10% (within 3 hrs) and 30% (within 1 hour), respectively. Re-dioxo-tetrofosmin which was used as a model of Re(V)-ligand, was obtained through ligand exchange reaction with the yield of 92.1%. The result showed that Re-oxo-gluconate can be successfully synthesized in high yield but low stability. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5832 10.17146/jsmi.2015.16.4.4217 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 148-153 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5832/4270 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5833 2026-11-02T02:51:48Z jsmi:ART

SINTESIS LITHIUM TITANAT DENGAN METODE HIDROTERMAL DAN EFEK SUHU SINTERING PADA KARAKTERISTIK NANOSTRUKTURNYA Priyono, Bambang Juliadi Syahrial, Anne Zulfia Yuwono, Akhmad Herman Kartini, Evvy Hidrotermal Lithium titanat Sintering Sol-gel Xerogel TiO2 SINTESIS LITHIUM TITANAT DENGAN METODE HIDROTERMAL DAN EFEK SUHU SINTERING PADA KARAKTERISTIK NANOSTRUKTURNYA. Lithium titanat merupakan salah satu senyawa yang digunakan sebagai material anoda pada baterai lithium ion. Senyawa ini disintesis dengan mencampurkan TiO2 anatase dan lithium karbonat (Li2CO3) dan diproses menggunakan metode hidrotermal pada suhu 120℃ selama 15 jam, selanjutnya disinter pada tiga variasi suhu sintering yaitu 550℃, 650℃ dan 750℃ untuk menghasilkan LTO fasa spinel kristalin. TiO2 anatase yang dipakai dibuat dengan metode sol-gel dengan suhu kalsinasi 300℃ selama 2 jam. Senyawa yang dihasilkan diamati dengan menggunakan X-Ray Diffraction (XRD), Brunauer Emmet Teller (BET), Spektroskopi Infra Merah (FT-IR) dan Field Emission Scanning Electron Microscope (FE-SEM). Hasil foto mikrograf FE-SEM memperlihatkan padatan senyawa lithium titanat (Li4Ti5O12), Li2TiO3, dan sisa TiO2 rutile dengan struktur morfologi tidak beraturan sebagai aglomerat. Hasil XRD dan BET menunjukkan bahwa pada suhu sintering 550℃ dihasilkan ukuran kristalit ratarata 23,45 nm, luas permukaan 6,65 m2/g, dan didominasi oleh TiO2 rutile, sementara suhu sintering 650℃ dihasilkan ukuran kristalit rata-rata 27,70 nm, luas permukaan 1,91 m2/g, dan masih didominasi oleh TiO2 rutile dan pada suhu 750℃ dihasilkan ukuran kristalit rata-rata 52,06 nm, luas permukaan sangat kecil, dan didominasi oleh litihum titanat (Li4Ti5O12). Hasil FT-IR mengkonfirmasikan keberadaan LTO spinel pada padatan hasil sintering. Ukuran kristalit yang diperoleh dalam kisaran di bawah 100 nm, sesuai dengan tujuan penelitian ini. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5833 10.17146/jsmi.2015.17.1.4195 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 1-9 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5833/4272 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5834 2026-11-02T02:47:23Z jsmi:ART

KARAKTERISASI SIFAT LISTRIK DAN MAGNET LAPISAN TIPIS Fe-C/Si SETELAH IRADIASI IONAr+ Yunasfi P. Purwanto Lapisan tipis Fe-C/Si Radiasi ion Konduktivitas Kapasitansi Magnetoresistance Telah dilakukan karakterisasi sifat listrik dan magnet lapisan tipis Fe-C/Si setelah iradiasi ion Ar+. Lapisan tipis Fe-C/Si diiradiasi dengan ion Ar+ pada dosis antara 1 × 1016 sampai 5 × 1017 ion/cm2. Hasil pengamatan morfologi permukaan lapisan tipis dengan Scanning ElectronMicroscope (SEM) memperlihatkan permukaan yang halus dan rata dengan terdeposisikan secara homogen di atas substrat Si (100). Pengamatan penampang lintang dengan SEM menunjukkan terbentuknya lapisan tipis Fe-C di atas permukaan substrat Si(100). Hasil pengukuran sifat listrik dan sifat magnet lapisan tipis Fe-C/Si menunjukkan bahwa nilai konduktansi (G), kapasitansi (C) dan nisbah magnetoresistance (MR) meningkat akibat pengaruh iradiasi ion Ar+ dan nilai nilai ini semakinmeningkat seiring dengan penambahan dosis radiasi.Dengan demikian, radiasi ionAr+berpotensi diaplikasikan di bidang elektromagnetik karena dapat meningkatkan sifat listrik dan magnet bahan. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5834 10.17146/jsmi.2015.16.4.4218 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 154-158 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5834/4271 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5836 2026-11-02T02:47:23Z jsmi:ART

KORELASI RADIOMETRI TERHADAP KANDUNGAN BESI PADA BIJIH URANIUM BM-179 KALAN-KALIMANTAN BARAT Rachmat Sahputra M. Rif’at Bijih uranium BM-179-Kalan-Kalimantan Barat Korelasi Radiometeri Besi Bijih uraniumBM-179 Kalan Kalimantan Barat adalah bijih batuan dari Kalan, Kalimantan barat. Penelitian bertujuan mengetahui korelasi radiometeri terhadap kandungan besi serta keterkaitannya dengan kandungan uranium. Metode untuk pemilihan sampel menggunakan ROS alat SPP-NF; pengayaan mineral menggunakan preparasi fisika flotasi. Penentuan kandungan besi menggunakan analisis dengan AAS Varian Spectr AA-20 (λ=248,3 nm) dan analisis kandungan uranium melalui spektrum uranil-Br-PADAP (λ=574 nm). Hasil penelitian menunjukkan adanya korelasi linier antara radiometri dengan kandungan uranium mengikuti persamaan y=3,5408x+1867,3, dan penurunan kandungan besi terhadap peningkatan radiometri dengan persamaan y=-1,351x+31261. Hasil penelitian juga menunjukkan bahwa bijih akan memiliki kandungan uranium tinggi dengan kandungan besiminimal dapat diperoleh dengan radiometri ≥ 6000 cps. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5836 10.17146/jsmi.2015.16.4.4219 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 159-163 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5836/4274 https://creativecommons.org/licenses/by-sa/4.0

oai:ojs.ejournal.brin.go.id:article/5838 2024-08-06T07:21:31Z jsmi:ART

oai:ejournal.brin.go.id:article/5839 2026-11-02T02:51:48Z jsmi:ART

STUDI PENDAHULUAN PEMBUATAN LAPISAN TIPIS MWCNT-Fe PADA PERMUKAAN GELAS DENGAN SPIN COATING P.Purwanto Yunasfi Mustofa, Salim Lapisan tipis XRD Spin Coating Konduktansi Kapasitansi Spektrum Raman STUDI PENDAHULUAN PEMBUATAN LAPISAN TIPIS MWCNT-Fe PADA PERMUKAAN GELAS DENGAN SPIN COATING. Telah dilakukan pembuatan lapisan tipis Multi-Walled Carbon Nanotubes (MWCNT)-Fe pada permukaan gelas. Pengukuran struktur kristal campuran serbuk MWCNT-Fe dilakukan dengan XRD, dimana pola difraksi yang nampak menunjukkan adanya puncak dari carbon dan Fe saja, tidak ditemukan unsur pengotor lainnya. Pengamatan morfologi dengan menggunakan SEM menunjukkan permukaan lapisan tipis MWCNT-Fe yang terbentuk pada permukaan substrat gelas. Pengukuran sifat listrik pada lapisan tipis MWCNT-Fe selanjutnya dilakukan untuk mengetahui efek perubahan frekuensi ukur terhadap nilai konduktansi dan kapasitansi. Secara umum nilai konduktansi relatif stabil terhadap perubahan frekuensi, sedangkan nilai kapasitansi lapisan tipis MWCNT-Fe mengalami penurunan seiring dengan naiknya frekuensi ukur. Namun seiring dengan bertambahnya persen (%) berat Fe di dalam lapisan tipis, nilai konduktansi lapisan tipis naik drastis, dan sebaliknya nilai kapasitansi mengalami penurunan drastis seiring dengan naiknya frekuensi pengukuran. Dari spektrum Raman terlihat adanya puncak D band pada posisi 1310 cm-1 hingga 1320 cm-1, puncak harmonik pertama G band (tangensial G band) pada posisi 1580 cm-1 hingga 1595 cm-1, dan puncak harmonik kedua G band (G’ band) pada posisi 1605 cm-1 hingga 1615 cm-1. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5839 10.17146/jsmi.2015.17.1.4196 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 10-14 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5839/4273 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5840 2026-11-02T02:51:48Z jsmi:ART

STUDI X-RAY DIFFRACTOMETRY PADA STRUKTUR COATING ALUMUNIUM YANG DIPREPARASI DENGAN METODE MECHANICAL ALLOYING Rosita, Nita Sudiro, Toto Aryanto, Didik Mahardika Prasetya Aji Mechanical alloying Coating XRD Struktur Annealing STUDI X-RAY DIFFRACTOMETRY PADA STRUKTUR COATING ALUMUNIUM YANG DIPREPARASI DENGAN METODE MECHANICALALLOYING. Coating alumunium (Al) telah berhasil dideposisikan pada permukaan baja karbon rendah (low carbon steel) dengan menggunakan metode pemaduan mekanik (mechanical alloying). Setelah dideposisikan, coating alumunium diannealing di dalam vacum furnace pada suhu 600 o C, 700 o C dan 800 o C dengan kondisi vakum sekitar 5,6 Pa. Transformasi fasa dan perubahan struktur pada coating alumunium sebagai fungsi suhu annealing dipelajari dengan menggunakan teknik difraksi sinar-X (XRD). Puncak difraksiAl(111) dari hasil karakterisasi XRD mengindikasikan bahwa coating alumunium telah terdeposisi pada permukaan low carbon steel. Selain itu, hasil XRD juga menunjukkan transformasi fasa dan perubahan struktur coating alumunium sebagai efek suhu annealing. Hal itu ditandai dengan munculnya fasa Al3,2Fe, Fe3 Al, dan Fe0,8Al0,2 pada pola difraksi XRD setelah diannealing. Peningkatan suhu annealing menyebabkan penurunan d-spacing, parameter kisi dan konstanta kisi kristal Fe0,8Al0,2(110), namun terjadi peningkatan pada regangan kisi dan kerapatan dislokasi. Evolusi pada struktur coating terjadi karena difusi alumunium ke dalam low carbon steel. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5840 10.17146/jsmi.2015.17.1.4197 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 15-21 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5840/4276 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5841 2026-11-02T02:47:23Z jsmi:ART

OPTIMASI PROSES ANNEALING PADA PROSES FINE DRAWING UNTU KMEMPERBAIKI SIFAT MEKANIS PRODUK KAWAT TEMBAGA Iwan Setyadi M. Syawal Proses penarikan Kawat tembaga Suhu annealing Kekuatan tarik Softability Kawat tembaga banyak digunakan untuk membuat kabel untuk keperluan listrik dan elektronik.Kawat tembaga dibuat dengan proses penarikan yan gmelalui serangkaian cetakan conical drawing untukmengurangi diamater kawat seseuai dengan diameter yang diinginkan. Salah satu permasalahan industri pembuat kawat adalahmahalnya energi. Dalam penelitian ini, percobaan yang dilakukan ditujukan untuk mendapatkan kondisi proses annealing yang optimal guna menghemat pemakaian energi. Penelitian ini dilakukan dengan menghilangkan proses annealing awal dalam proses penarikan kawat dan diganti dengan mengoptimalkan suhu proses annealing akhir. Dari hasil penelitian diketahui bahwa pada suhu annealing 380 oC didapatkan sifat mekanis optimum kawat tembaga, dimana diperoleh elongasi 29%, kekuatan yield 15,59 kg/mm2, kekuatan tarik 24,57 kg/mm2 dan softability 147 gram. Hasil ini sesuai standar, dimana elongasi minimal sebesar 27%, kekuatan yield minimal 15,3 kg/mm2, kekuatan tarik minimal 21,4 kg/mm2 dan softablity maksimal 220 gram. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5841 10.17146/jsmi.2015.16.4.4220 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 164-172 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5841/4277 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5842 2026-11-02T02:51:48Z jsmi:ART

EFEK ROL PANAS PADA SIFAT MEKANIK PLAT BAJA 15%Cr-25%Ni BAHAN STRUKTUR REAKTOR Parikin T.H.Priyanto A.H.Ismoyo M. Dani Baja 15%Cr-25%Ni Rol panas Sifat mekanik Difraksi sinar-X Neutron   EFEK ROL PANAS PADA SIFAT MEKANIK PLAT BAJA 15%Cr-25%Ni BAHAN STRUKTUR REAKTOR. Pengukuran pengaruh proses pengerolan panas pada sifat mekanik plat baja 15%Cr-25%Ni untuk menentukan mampu bentuk (formability) bahan, telah dilakukan. Spesimen bahan plat dibentuk balok berdimensi 50x20x7 mm3 untuk memudahkan pengambilan data pengukuran. Hasil memperlihatkan bahwa: pengerolan panas mampu mendeformasi ukuran butiran baja 15%Cr-25%Ni menjadi lebih kecil; mula-mula bulat sebesar 6 um dan setelah direduksi 70% menjadi panjang sebesar 4 μm (arah longitudinal) dan pipih sebesar 3 μm (arah transversal). Kekerasan baja 15%Cr-25%Ni meningkat hingga 27% dari nilai mula-mula sekitar 100,02 HVN untuk bahan non rol panas menjadi sekitar 126,86 HVN untuk bahan yang direduksi rol panas 70%. Peningkatan kekerasan ini didominasi oleh fenomena strain hardening dan penghalusan butir (bukan inklusi krom karbida Cr C). Peningkatan kekerasan ditandai oleh angka HVN yang membesar, yang diakibatkan oleh penyusutan volume kristal sebesar 0,35%. Penyusutan ini teridentifikasi dari pergeseran puncak bidang difraksi (311) dan (222) pada sudut difraksi berturut-turut sekitar 0=91° dan 96° yang mengakibatkan parameter kisi mengecil. Berbeda dengan pengerolan dingin yang dilakukan di bawah temperatur rekristalisasi bahan, transformasi fasa akibat deformasi tidak terjadi pada pengerolan panas baja 15%Cr-25%Ni ini seluruhnya memiliki struktur kristal kubus pusat muka (fcc) dengan grup ruang Fm3m (1-225) dan parameter kisi a = 3,58 Å. Akibat pengerolan terjadi orientasi kristalit yang kuat dalam komponen tekstur Brass {110} <112> dengan pelebaran dalam komponen Goss {011} <100> dimana sebelum pengerolan kristalit terorientasi secara dominan dalam komponen kubik {001} <100>. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5842 10.17146/jsmi.2015.17.1.4198 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 22-28 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5842/4278 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5844 2026-11-02T02:47:23Z jsmi:ART

EFEK DOPING ATOM ARSENIK PADA PITA ENERGI MATERIAL SILICENE BERDASARKAN PERHITUNGAN TEORI KERAPATAN FUNGSIONAL Mauludi Ariesto Pamungkas Wafa Maftuhin Silicene Arsenik Teori Kerapatan Fungsional Menyusul sukses graphene dengan sifat-sifatnya yang super dan unik, material dua dimensi yang strukturnya serupa dengan graphene menjadi pusat perhatian para peneliti material. Silicene sebagai material yang memiliki struktur kristal sama dengan graphene namun terdiri dari atom-atom silicon menjadi material yang sangat penting mengingat dominasi silicon sebagai bahan utama komponen elekronika. Struktur pita dari silicene murni dan yang di doping dengan atom As diteliti dengan metode teori kerapatan fungsional (Density Functional Theory). Atom As disimulasikan pada beberapa posisi yang paling mungkin. Berdasarkan perhitungan energi pembentukan, posisi substitusi adalah posisi yang paling stabil dari atomAs pada silicene. Posisi atom As tepat di atas atom silkon jauh lebih stabil dari posisi di atas hexagonal (posisi hollow). Hasil perhitungan struktur pita menunjukkan bahwa silicene murni adalah semimetal sedangkan setelah di-doping dengan atom As berubah menjadi konduktor. Hasil ini berbeda dengan penambahan atom As pada graphene, di mana justru membuka band gap nya BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5844 10.17146/jsmi.2015.16.4.4221 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 173-177 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5844/4279 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5845 2026-11-02T02:47:23Z jsmi:ART

MODIFIKASI KAIN POLIESTER/SELULOSA MENGGUNAKAN PROSES KARBOKSIMETILASI METODE BENAM PERAS PEMANGGANGAN Kuntari Adi Suhardjo Setio Legowo Karboksimetilasi Poliester/selulosa Natrium khloroasetat Natrium hidroksida Benam peras pemanggangan Kain poliester/selulosa mempunyai penyerapan kelembaban yang rendah sehingga tidak nyaman dipakai. Salah satu cara untuk meningkatkan mutu penyerapan kain, telah dilakukan percobaan optimasi proses karboksimetilasi dengan modifikasi selulosamenjadi karboksimetil selulosamenggunakan natrium khloroasetat yang berfungsi sebagai zat pengeter, divariasikan 2 N, 3 N dan 4 N dan natriumhidroksida yang berfungsi sebagai pembentuk natrium selulosat divariasikan 6 N, 8 N, 10 N dan 12 N.Adanya natrium hidroksida dapat mengikis poliester sehingga menipis yang mengakibatkan pegangan kain lebih lembut. Percobaan yang dilakukan menggunakan metode benam peras pemanggangan pada suhu 120 oC, 130 oC, 140 oC, 150 oC dan 160 oC waktu 5 menit. Pengujian yang dilakukan adalah pengurangan berat poliester, struktur selulosa dengan spektruminframerahmenggunakan larutan methylene blue, penyerapan kelembaban, kekuatan tarik, sudut kusut,stabilitas dimensi dan kekakuan kain. Kondisi optimum dicapai pada pemakaian natrium khloroasetat 4N, natrium hidroksida 8N dan suhu pemanggangan 120 oC. Hasil pengujianmenunjukkan bahwa terjadi 0,45%pengurangan berat poliester, 94,32% penyerapan zat warna methylene blue, 4,44%( naik 48%) penyerapan kelembaban, 21,50 kg (turun1,65 %) kekuatan tarik arah lusi dan 16 kg (turun 6,97 %) arah pakan, 148o(naik 32,14%) sudut kusut arah lusi dan 145o (naik 33,02%) arah pakan, 0,14%(naik 89,7%) stabilitas dimensi kain arah lusi dan 0,17%(naik 84,54%) arah pakan, 64,0 mg. cm (turun 14,6%) kekakuan kain arah lusi dan 39 mg.cm(turun 15,2%) arah pakan. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5845 10.17146/jsmi.2015.16.4.4222 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 178-187 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5845/4280 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5846 2026-11-02T02:47:23Z jsmi:ART

VARIASI KOMPOSISI NANO HIDROKSIAPATIT PADA POLY(1,8-OCTANEDIOL-COCITRATE) (POC) SEBAGAI BIODEGRADABLE BONE SCREW Fitriyatul Qulub Prihartini Widiyanti Jan Ady Hidroksiapatit Poly (1,8 Octanediol-co-Citrate) (POC) Nanomaterial Polimerisasi Kondensasi Biodegradable Bone Screw Tingginya kasus fraktur tulang sekitar 300-400 ditangani dengan metode fiksasi interna menggunakan bone screw. Diperlukan inovasi biomaterial yang memiliki sifat utama biodegradabel agar tidak memerlukan reoperation dan biokompatibel terhadap jaringan tubuh. Telah dilakukan penelitian mengenai variasi komposisi nano hidroksiapatit (HA) berasal dari ekstrak sisik ikan kakap pada Poly (1,8-octanediol-Co-Citrate) (POC) sebagai Biodegradable Bone Screw. Penelitian ini bertujuan mensintesis POC dan mengkarakterisasi pengaruh komposisi HA terhadap sifat mekanik dan biokompatibilitas komposit POC-HA. Sintesis POC dilakukan dengan metode polimerisasi kondensasi, terbentuk ikatan ester gugus C=O stretch pada 1731 cm-1 melalui uji gugus fungsi dari POC pra polimer. Pra polimer POC dikompositkan dengan nano-HA pada variasi komposisi 62%,65%,68%dan 71%, dilanjutkan perlakuan postpolymerization. Komposit POC-HA dilakukan karakterisasi uji kekerasan dan uji degradasi. Hasil pengujian menunjukkan komposisi nanopartikel HA memberikan pengaruh sifat mekanik dan biokompatibilitas. Seluruh sampel memiliki kuat tekan berkisar 3,64-9,56 MPa sesuai dengan kuat tekan tulang cancellous manusia (2-12 MPa). Melalui analisis Energy Dispersive X-Ray Spectroscopy (EDX), uji degradasi sampel terbukti kebioaktifitasan mineral apatit sebesar 7,5% (At%) dan terputusnya rantai C-X dari polimer POC sebesar 5,95% (At%) selama 4 minggu inkubasi dalam Simulated Body Fluid (SBF). Berdasarkan hasil karakteristik penelitian ini, komposit POC-HAberpotensi sebagai kandidat biodegradable bone screw. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5846 10.17146/jsmi.2015.16.4.4223 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 188-192 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5846/4282 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5847 2026-11-02T02:51:48Z jsmi:ART

PENGARUH PENAMBAHAN EKSTRAK KULIT BUAH JERUK DAN KULIT BUAH MANGGA SEBAGAI INHIBITOR KOROSI PADA BAJA KARBON DALAM MEDIA NaCl 3,5% Tubagus Noor R. Sari Kusuma W. Agung Purniawan Budi Agung K. Sulistijono Inhibitor alami Laju korosi API 5L Gr B PENGARUH PENAMBAHAN EKSTRAK KULIT BUAH JERUK DAN KULIT BUAH MANGGA SEBAGAI INHIBITOR KOROSI PADA BAJA KARBON DALAM MEDIA NaCl 3,5%. Penanggulangan korosi didalam pipa, salah satunya menggunakan suatu senyawa yang dinamakan inhibitor korosi. Pada penelitian ini digunakan pipa API 5L Gr B dalam media NaCl 3,50% dengan pemberian inhibitor ekstrak kulit jeruk (Citrus) dengan variasi konsentrasi 0 ppm, 100 ppm, 200 ppm, 300 ppm, 370 ppm and 400 ppm dan kulit mangga (Mangifera indica L) dengan variasi konsentrasi 0 ppm, 200 ppm, 300 ppm, 400 ppm, 500 ppm dan 600 ppm. Metode ekstrak menggunakan proses maserasi dan komposisi senyawa ekstrak diuji dengan alat uji Gas Chromatography-Mass Spectrometry (GC-MS). Perhitungan laju korosi menggunakan alat uji Potentiodynamic Polarization. Mekanisme inhibisi diamati dengan menggunakan Electrochemical Impedance Spectroscopy (EIS). Hasil uji komposisi menunjukkan adanya kandungan asam 12-bromolauric 8,14% dan asam hexadecanoic 4,30% yang dapat membentuk lapisan tipis pada permukaan logam. Pengujian tanpa menggunakan inhibitor didapatkan laju korosi sebesar 8,20 mpy sedangkan dengan variabel konsentrasi inhibitor ekstrak kulit jeruk 400 ppm didapatkan laju korosi sebesar 0,60 mpy dan untuk kulit mangga konsentrasi 600 ppm didapatkan laju korosi sebesar 1,0 mpy. Kesimpulan yang didapatkan dari percobaan ini adalah penambahan inhibitor alami dapat menurunkan laju korosi pada baja karbon. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5847 10.17146/jsmi.2015.17.1.4199 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 29-33 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5847/4281 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5848 2026-11-02T02:51:48Z jsmi:ART

PENENTUAN KOAGULAN UNTUK MENGOLAH AIR LINDI BANTAR GEBANG MENGGUNAKAN KOAGULAN POLY ALUMINIUM CHLORIDE, TAWAS DAN POLYDIALLYL DIMETHYL AMMONIUM CHLORIDE Muhammad Lindu Bambang Iswanto Nancy Senduk Leachate Koagulasi PAC Tawas POLYDADMAC PENENTUAN KOAGULAN UNTUK MENGOLAH AIR LINDI BANTAR GEBANG MENGGUNAKAN KOAGULAN POLY ALUMINIUM CHLORIDE, TAWAS DAN POLYDIALLYL DIMETHYLAMMONIUM CHLORIDE. Telah dilakukan penentuan dosis optimum pada ketiga jenis koagulan Poly Aluminium Chloride (PAC), tawas dan Polydiallyl Dimethyl Ammonium Chloride (POLYDADMAC) pada air lindi yang berasal dari inlet Instalasi Pengolahan Air Sampah (IPAS) III Bantar Gebang Bekasi.Tujuan penelitian untuk menentukan jenis koagulan, dosis dan pH optimum untuk mengolah air lindi serta mengetahui sifat atau karakteristik dari lumpur hasil koagulasi. Air lindi dikoagulasi dan diflokulasi menggunakan jartest pada pH 7 pada berbagai variasi dosis koagulan. Dosis PAC divariasi antara 150 mg/L sampai dengan 1200 mg/L, dosis tawas antara 200 mg/L sampai dengan 1400 mg/l dan dosis POLYDADMAC antara 25 mg/L sampai dengan 225 mg/L guna mendapatkan dosis koagulan optimum. Dosis optimum koagulan ini selanjutnya digunakan untuk menentukan pH optimum dengan cara memvariasikan pH koagulasi pada pH 6; 6,5; 7; 7,5 dan 8. Parameter yang diukur adalah Chemical Oxygen Demand (COD), TSS, ammonia, nitrat, dan kekeruhan serta penentuan karakteristik lumpur berupa nilai sludge volume index (SVI). Penyisihan COD optimum diperoleh pada dosis 800 mg/L untuk PAC dan 1200 mg/L untuk Tawas,dan 125 mg/L untuk POLYDADMAC. Penyisihan ammonia dan nitrat dari proses koagulasi dan flokulasi terbukti tidak efektif, penurunan kekeruhan mencapai 66,6% - 71,2% dan TSS 42,4% - 52%. Penyisihan terbesar hanya pada TSS dan kekeruhan dan tidak banyak berpengaruh pada penyisihan ammonia dan nitrat. Lumpur hasil koagulasi penggunaan ketiga koagulan tersebut menunjukkan bahwa lumpur hasil koagulasi dengan PAC menghasilkan lumpur yang lebih kompak dan padat dibanding dengan tawas dan POLYDADMAC. Lumpur yang dihasilkan menggunakan koagulan POLYDADMAC lebih banyak menyerap air dibanding tawas dan PAC. Lama waktu yang diperlukan untuk pengeringan lumpur sampai mencapai berat stabil adalah 12 hari dengan suhu ruang 26,7 o C hingga 28,7 o C dengan kelembaban 48 hingga 61%. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5848 10.17146/jsmi.2015.17.1.4200 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 34-40 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5848/4283 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5849 2026-11-02T02:51:48Z jsmi:ART

SINTESIS HIDROGEL KOPOLIMER PATI ILES-ILES DENGAN ASAM AKRILAT, AKRILAMIDA DAN METILENABISAKRILAMIDA SEBAGAI PEMBENAH TANAH Achmad Sjaifullah Sugeng Winarso Agung Budi Santoso Hidrogel Pati iles-iles Pembenah tanah Daya serap air SINTESIS HIDROGEL KOPOLIMER PATI ILES-ILES DENGAN ASAM AKRILAT, AKRILAMIDA DAN METILENABISAKRILAMIDASEBAGAI PEMBENAHTANAH. Hidrogel kopolimer cangkok pati iles-iles dengan asam akrilat, akrilamida dan metilena bis-akrilamida disintesis menggunakan teknik polimerisasi dalam larutan dengan pelarut air dan inisiator kalium persulfat. Pati iles-iles yang digunakan diperoleh dengan menghomogenkan umbi iles-iles, mencucinya dengan air dan menggumpalkannya dengan metanol beberapa kali. Kelarutan pati iles-iles yang diperoleh dengan cara tersebut mencapai 5 % b/b. Polimerisasi dalam larutan dilakukan tanpa hembusan gas nitrogen. Hidrogel yang dihasilkan ditentukan daya serap airnya dan struktur kimianya berdasarkan spektrum FTIR. Berdasarkan berat hidrogel yang dihasilkan dapat dikatakan bahwa sintesis menghasilkan 100 % polimerisasi pada suhu 55-60 o C. Hidrogel yang dihasilkan pada kondisi polimerisasi tertentu mempunyai daya serap air hingga 51 kali, yaitu yang disintesis dengan perbandingan konsentrasi pati iles-iles dengan asam akrilat, akrilamida dan bis-akrilamida = 1:3:3:0,01. Hidrogel kopolimer kemudian digunakan sebagai pembenah tanah dengan mempelajari kemampuan tanah berpasir dalam menyimpan dan menguapkan airnya. Tanah berpasir yang dicampur dengan 0,5 % b/b hidrogel dapat menyerap air hingga dua setengah kali dari pada tanah tanpa hidrogel dan dapat menahan lebih dari separo air yang diserapnya saat terjadi kesetimbangan penguapan dan penyerapan air. Kesetimbangan penguapan dan penyerapan air dicapai setelah 5 hari pada suhu udara 23-29 o C dan kelembaban 40-83 %. BRIN Publishing (Penerbit BRIN) 2015-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5849 10.17146/jsmi.2015.17.1.4201 Jurnal Sains Materi Indonesia; Vol. 17 No. 1 (2015): Jurnal Sains dan Materi Indonesia; 41-46 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5849/4284 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5850 2026-11-02T02:47:23Z jsmi:ART

PENGARUH KONSENTRASI (NH4)2SO4 TERHADAP KARAKTERISTIK TiO2 HASIL SINTESIS DENGAN METODE SOL GEL Siti Wardiyati Wisnu Ari Adi Erwa Syahbani TiO2 N,S-codoping, Degradasi Energi band gap Fotokatalitik TiO2 anatase telah berhasil disintesis dengan metode sol-gel menggunakan prekursor titanium klorida (TiCl4) dalam berbagai konsentrasi (2,0 M- 6,0 M) (NH4)2SO4. Penelitian ini bertujuan untukmengetahui pengaruh konsentrasi garam (NH4)2SO4 terhadap karakteristik TiO2 hasil sintesis, seperti ukuran partikel, luas permukaan, band gap dan kinerja fotokatalitik TiO2 terhadap degradasi methylene blue. Karakterisasi TiO2 hasil sintesis dilakukan dengan menggunakan alat X-Ray Diffractometer (XRD) untuk mengetahui fasa yang terbentuk, Transmission Electron Microscope (TEM) untuk menentukan ukuran partikel, surface area analyzer untuk mengukur luas permukaan, UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) untuk menentukan nilai energi gap, dan UV-Vis Lambda 25 untuk menentukan konsentrasi methylene blue. Hasil karakterisasi menunjukkan bahwa Ti2O hasil sintesis telah terdoping oleh atom N dan S, berbentuk kristalin dengan fasa anatase, ukuran partikel berkisar 5 nm hingga 15 nm, dan nilai energi band gap bervariatif dari 2,44 eV hingga 3,03 eV. Konsentrasi (NH4)2SO4 optimum dicapai pada (NH4)2SO4 4,0 M, dan pada konsentrasi tersebut Ti2O yang diperoleh dapat mendegradasi senyawa methylene blue 10 mg/L hingga 92%dengan konsentrasi katalis 1 g/L. BRIN Publishing (Penerbit BRIN) 2015-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5850 10.17146/jsmi.2015.16.4.4224 Jurnal Sains Materi Indonesia; Vol. 16 No. 4 (2015): Jurnal Sains dan Materi Indonesia; 193-199 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5850/4285 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5852 2026-11-02T02:59:30Z jsmi:ART

SINTESIS MEMBRAN KOPOLIMERISASI SELULOSA ASETAT-GLUTARALDEHID MENGGUNAKAN IRADIASI BERKAS ELEKTRON UNTUK PERVAPORASI ETANOL-AIR E. Evy Ernawati Meri Suhartini Membran Selulosa asetat Glutaraldehid Kopolimerisasi Berkas elektron Pervaporasi SINTESIS MEMBRAN KOPOLIMERISASI SELULOSA ASETAT-GLUTARALDEHID MENGGUNAKAN IRADIASI BERKAS ELEKTRON UNTUK PERVAPORASI ETANOL-AIR. Membran selulosa asetat dapat digunakan untuk pervaporasi etanol-air, namun membran ini memiliki derajat penggembungan tinggi sehingga kinerjanya rendah maka perlu dimodifikasi. Modifikasi pada studi ini dilakukan dengan mengkopolimerisasi membran selulosa asetat dan monomer glutaraladehid menggunakan inisiator iradiasi berkas elektron. Studi ini bertujuan untuk mengetahui pengaruh glutaraldehida dan iradiasi berkas elektron terhadap karakteristik serta kinerja membran selulosa asetat termodifikasi terhadap pervaporasi etanol-air. Karakterisasi yang dilakukan meliputi penentuan derajat kopolimerisasi dan penggembungan, kekuatan tarik, dan morfologi (SEM) dari membran selulosa asetat termodifikasi. Sementara penentuan kinerja membran selulosa asetat termodifikasi meliputi fluks dan selektivitas. Hasil penelitian menunjukkan bahwa pada penambahan glutaraldehida 1%, dan dosis iradiasi 30 kGy, terjadi penurunan nilai derajat penggembungan sebesar 66,16%, peningkatan kekuatan tarik sebesar 49,75%, peningkatan nilai selektivitasnya sebesar 16,5 kali dan penurunan nilai fluks sebesar 0,7 kali. Modifikasi selulosa asetat dengan dengan penambahan glutaraldehida dan radiasi berkas elektron dapat memperbaiki karakteristik dan kinerja membran selulosa asetat untuk pervaporasi etanol-air. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5852 10.17146/jsmi.2016.17.2.4203 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 56-62 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5852/4287 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5856 2026-11-02T02:32:19Z jsmi:ART

ENHANCEMENT OF GIANT MAGNETORESISTANCE IN Fe2O3 -MWCNT/PVA NANOCOMPOSITE FILM S. Purwanto Wisnu Ari Adi Salim Mustofa Magnetoresistance Nanocomposite film Fe2O3 -MWCNT Polyvinyl Alcohol Synthesis and magnetic properties characterization of Fe2O3-MWCNT/PVA nano Composite film were carried out. Fe2O3-MWCNT as a filler of nano Composite thin film were synthesized using simple mixing methods froma solution containing FeCl3, and Multi-Walled Carbon Nanotube (MWNT). The solution was sonicated for almost 20 minutes then dried at 450 oC for one hour. The mixture of the two composition was dispersed with Sodium Dodecyl Sulfate (SDS) in 20 mL aquabidest and homogenized by ultrasonicator for 15 minutes at 40 oC. Then filler was then mixed with Polyvinyl Alcohol (PVA) with some various concentration and dried overnight at room temperature. X-Ray Diffraction (XRD) analysis and Raman Spectroscopy were used to find out the presence of Fe2O3 phase in as prepared sample. Iron oxide phase partially filled in the wall of MWCNT observed by Transmission Electron Microscope (TEM). The Giant Magnetoresistance (GMR) properties were investigated. The maximum GMR value was negative 80% of the composition 1:9 filler/matrix volume ratio. The linear negative of the magnetoresistance (MR) ratio is coincident with a model as proposed by Nguyen, Spivak and Shklovskii (NSS) and related to the effect of quantum interference between Fe2O3-MWCNT in PVA matrix. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5856 10.17146/jsmi.2015.16.3.4225 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 97-101 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5856/4295 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5857 2026-11-02T02:32:19Z jsmi:ART

CRYSTAL STRUCTURE TRANSFORMATION OF Ba-Sr HEXAFERRITE AND ITS EFFECT ON PARTICLE ORIENTATION IN RECYCLE PROCESS Agus Sukarto Wismogroho Wahyu Bambang Widayatno Toto Sudiro Didik Aryanto Ba-Sr Hexaferrite Orientation Magnetic Field Anisotropy Magneto crystalline anisotropy In general, during its fabrication, 2-5%of total products of Ba-Sr hexaferrite permanent magnet will be rejected.Accordingly, an increase in rejected product of permanent magnet needs to be considered. It is expected that the re-utilization of rejected product can increase the production efficiency in order to achieve zero waste-production. In the present work, the recycling process of Ba-Sr hexaferrite permanent magnet was studied by applying 1 T magnetic field (anisotropic) to align the powder. The rejected products were milled using shaker mill PPF-UG for 10-40 min and then sintered at 1200 ºC for 60 min. The results show that the remanence of original powder was increased by 50% after the particle orientation. However, the recycled sample doesn’t show a significant different. SEM and XRD analysis show the crystalline structure transformation from symmetrical hexagonal to asymmetrical hexagonal structure with crystalline growth in a-b axis direction. This transformation leads to lost in its magneto crystalline anisotropy. Therefore, it was difficult to align the particle. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5857 10.17146/jsmi.2015.16.3.4226 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 102-106 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5857/4296 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5858 2026-11-02T02:32:19Z jsmi:ART

EFFECT OF ANNEALING ON Cu-Nb-Sn SUPERCONDUCTING WIRE Agung Imaduddin Bintoro Siswayanti Andika Widya Pramono Pius Sebleku Sigit Dwi Yudanto Hendrik Cu-Nb-Sn Superconducting wire Resistivity Annealing Residual Resistivity Ratio Critical Temperature (TC ) The most common application of superconductors is done in the form of superconducting wire. Among the existing types of superconductors, Cu-Nb-Sn superconductors are the most widely used as a wire, producing a high magnetic field. But the critical temperature (TC) values of its superconductors are low enough so that the resulting magnetic field and its application fields are limited. In this study we investigated the effect of annealing treatment on the Cu-Nb-Sn superconducting wire. Note that the process of annealing on superconducting wire can increase the value of the critical temperature of 8K to 16K. The increase is predicted because of the forming of Nb3Sn compounds, and the Nb3Sn compound becomes more stable.Annealing processes were performed at temperatures ranging from 873K to 1173K as well as various annealing time from 32 hours to 120 hours. The superconductivity of the samples were analyzed using resistivity measurement by cryogenic system under low temperature condition. The annealing can be performed optimally at the temperature of 873K for 72 hours when TC reaches 16K. However, the purity of the conductivity properties obtained at the optimal annealing temperature at 723K for 72 hours. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5858 10.17146/jsmi.2015.16.3.4227 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 107-111 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5858/4297 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5859 2026-11-02T02:32:19Z jsmi:ART

PHOTOCURRENT ENHANCEMENT OF CdS QUANTUM DOT SENSITIZED TiO2 ELECTRODE IN THE PRESENCE OF GOLD NANOPARTICLES Supriyono Hedi Surahman Yuni Krisyuningsih Krisnandi Jarnuzi Gunlazuardi Photocurrent TiO2 CdS quantum dot Gold nanoparticles Photo current enhancement of CdS Quantum Dot (CdS-QD) sensitized TiO2 electrode in the presence of gold nano particles had been investigated. CdS quantum dots were prepared by successive ionic layer adsorption and reaction (SILAR) method, in which solution containing Cd(CH3COO)2 and Na2S were used as a precursor. Where as, gold nano particles was synthesized using solution containing HAuCl4 as a precursor, NaBH4 as a reducing agent and polyvinyl pyrrolydone (PVP) as a stabilizer. The film of CdS quantum dots and Au nano particles were characterized by UV-Vis spectrophotometer, Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and electro chemical working station. Photo electrochemical study revealed that CdS-sensitized TiO2 electrode with gold nanoparticles have been able to increase photocurrent of 54 A/cm2 to 68 A/cm2, so the photocurrent enhancement of approximately 25% was observed. This observation indicates that the gold nanoparticles is potentially applicable to enhance photocurrent in a CdS-QD sensitized TiO2 electrode, which may lead to the development of more efficient solar cell. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5859 10.17146/jsmi.2015.16.3.4228 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 112-117 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5859/4298 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5860 2026-11-02T02:32:19Z jsmi:ART

ANALISIS PENGARUH MECHANICAL MILLING MENGGUNAKAN PLANETARY BALL MILLING TERHADAP STRUKTUR KRISTAL DAN STRUKTUR MIKRO SENYAWA LiBOB Etty Marti Wigayati Raden Ibrahim Purawiardi Struktur kristal Fasa Durasi milling Ukuran kristalit Regangan kisi Telah dilakukan pembuatan senyawa Lithium bis Oksalat Borat (LiBOB) dari bahan baku LiOH, asam oksalat dan asam borat dengan metode reaksi padat padat. Serbuk yang dihasilkan dilanjutkan penghalusan menggunakan planetary ball milling dengan durasi milling di buat bervariasi (4 jam, 5 jam, 6 jam, 10 jamdan 13 jam). Serbuk LiBOB yang dihasilkan dianalisis menggunakan X-Ray Diffractometer (XRD) untuk mengetahui fasa yang terbentuk, struktur kristal dan ukuran kritalitnya. Hasil identifikasi senyawa LiBOB dengan XRD berupa pola difraksi kemudian dianalisismenunjukkan terbentuknya 2 fasa yaitu fasa LiB(C2O4)2 dan fasa LiB(C2O4)2.(H2O) dengan sistem kristal orthorhombic. Kerapatan atom paling kecil pada senyawa LiBOB dengan durasi milling 5 jam dan volum unit sel paling besar pada senyawa LiBOB dengan durasi milling 10 jam. Diameter ukuran kristalit berubah seiring dengan durasi milling, sedang regangan kisi terendah pada durasi milling 4 jam dan tertinggi pada durasi milling 5 jam. Durasi milling 5 jam adalah paling bagus dimana pada fasa ini memberikan ruang paling besar pada tiap unit sel dan regangan kisi paling besar sehingga dapat memudahkan ruang gerak transfer ion Li pada baterai Lithium. Senyawa LiBOB hasil sintesis mempunyai sistem kristal yang teratur. Tingkat keteraturan kristal yang dihasilkan ditunjukan dengan perhitungan indeks kristalinitas yang tinggi. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5860 10.17146/jsmi.2015.16.3.4230 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 126-132 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5860/4299 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5861 2026-11-02T02:32:19Z jsmi:ART

PENGARUH PENAMBAHAN GARAM-GARAM LITHIUM TERHADAP SIFAT ELEKTROLIT PADAT POLIMER BERBASIS KITOSAN Evi Yulianti Sudaryanto Jadigia Ginting Kitosan Garam lithium Elektrolit polimer Transfer ion Energi aktivasi Telah dilakukan penelitian untuk mempelajari pengaruh penambahan berbagai jenis garam lithium terhadap sifat elektrolit polimer berbasis kitosan yang akan diaplikasikan pada baterai lithium isi ulang. Adapun jenis garam lithium yang ditambahkan adalah Li-Asetat, Li-Perklorat, LiPF6 dan Li-Triflat dengan komposisi yang sama. Pembuatan lembaran elektrolit polimer padat dilakukan dengan metode casting dengan penguapan perlahan di dalam oven. Karakterisasi lembaran elektrolit padat dilakukan menggunakan X-Ray Diffractometer (XRD), spektroskopi infra merah (FT-IR), spektrometer impedansi (LCR meter) dan pengukuran bilangan transfer ion. Hasil karakterisasi sinar X menunjukkan bahwa penambahan berbagai jenis garam lithium merusak kristalinitas kitosan. Pengukuran konduktifitas ionik memberikan hasil tertinggi pada penambahan garam Li-Perklorat, yang nilainya masih pada orde yang sama dengan penambahan garamLiPF6 dan Li-Triflat ~ 10-6 S/cm. Konduktivitas juga mengalami kenaikan dengan kenaikan suhu. Energi aktivasi terendah 0,016 eV dan bilangan transfer ion tertinggi ~ 0.5 diperoleh pada penambahan garam LiPF6 BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5861 10.17146/jsmi.2015.16.3.4231 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 133-138 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5861/4300 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5862 2026-11-02T02:32:19Z jsmi:ART

MODIFICATION OF MIXED STRUCTURE TiO2 NANOPOROUSNANOTUBE ARRAYS WITH CdS NANOPARTICLE AND THEIR PHOTOELECTROCHEMICAL PROPERTIES Hedi Surahman Supriyono Yuni K Krisnandi Jarnuzi Gunlazuardi TiO2 Nanotubes CdS Nanoparticle Photoelectrohemical SILAR Photocurrent In thiswork, a mixed structure TiO2 with a top nanoporous layer and an underneath highly ordered nanotube arrays layer (TNPs-NTAs) were prepared by anodic oxidation of Ti foil under controlled anodization time in an electrolyte containing fluoride ion,water and ethylene glycol. CdS nanoparticles (NPs) was deposited onto the mixed structure of TiO2 by Successive Ionic Layer Adsorption and Reaction (SILAR) with an aim toward tuning the photoelectrochemical performance to visible region. Themorphology, elemental composition, crystal structure, optical properties and photoelectrochemical performance of TNPs-NTs and CdS modified (CdS/TNP-NTAs) samples were characterized by Field Emisi Scanning Electron Microscope (FESEM), Electron Dispersive Spectroscopy (EDS), X-Ray Diffractometer (XRD), Diffuse Reflactance Spectroscopy (DRS) and electrochemical working station respectively. The results indicate that CdS nanoparticles uniformly decorated on top of surface and inner wall of TNPs-NTs sample. No clogging of CdS-NP at the mouth TNPs-NTAs was observed. The CdS/TNP-NTs show an increasing in the visible light adsorption and photocurrent response. Under white light illumination (9.93 mW/cm2), we found that the CdS/TNPs-NTAs have an optimum photocurrent density of 1.16 mA/cm2 , corresponding to energy photoconversion efficiency of 9.75%, which is 7 times higher than that of the bare TiO2 (TNPs-NTAs). The increase of photocurrent is attributed to the enhancement of charge separation efficiency and improved electron transport. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5862 10.17146/jsmi.2015.16.3.4229 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 118-125 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5862/4301 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5863 2026-11-02T02:32:19Z jsmi:ART

PRODUKSI ENZIM SELULASE OLEH FUNGI SELULOTIK YANG DIRADIASI SINAR GAMMA DALAM FERMENTASI JERAMI PADI T.R.D.Larasati N.Mulyana M.Anggriawan Y. Effendi Enzim selulase Fungi Radiasi Fermentasi Produksi enzim selulase oleh Trichoderma viride dan Aspergillus niger yang dipapari radiasi sinar Gamma dosis rendah telah dilakukan menggunakan substrat jerami padi dengan metode Solid State Fermentation (SSF). Iradiasi sinar gamma dosis rendah berpengaruh terhadap percepatan aktivitas exo-enzim oleh mikroba. Strain Trichoderma viride dan Aspergillus niger dipapari radiasi sinar Gamma dengan dosis rendah : 0 Gy, 50 Gy, 150 Gy, 250 Gy dan 350 Gy. Parameter proses SSF yang berkaitan dengan dekomposisi enzimatis adalah total fungi, nilai pH, aktifitas enzimselulase, kadar glukosa, dan protein kasar diamati selama 16 hari. Hasil penelitian menunjukkan adanya pengaruh iradiasi sinar gamma dosis rendah dan waktu fermentasi terhadap kemampuan enzimatik dengan nilai dosis yang berbeda antar strain. Aspergillus niger memiliki dosis iradiasi terbaik 350 Gy dengan peningkatan produksi enzim selulase sebesar 15,23 U/g Bk, kadar glukosa sebesar 6,25 mg/mL dan kadar protein kasar sebesar 10,1 %. Sedangkan Trichoderma viride memiliki dosis iradiasi optimal 150 Gy dengan peningkatan produksi enzim selulase sebesar 13,23 U/g Bk, dengan kadar glukosa sebesar 5,61 mg/mL dan kadar protein kasar sebesar 9,63% pada waktu fermentasi terbaik 8 hari. BRIN Publishing (Penerbit BRIN) 2015-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5863 10.17146/jsmi.2015.16.3.4232 Jurnal Sains Materi Indonesia; Vol. 16 No. 3 (2015): Jurnal Sains dan Materi Indonesia; 139-147 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5863/4302 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5865 2026-10-30T03:41:57Z jsmi:ART

PENGARUH pH TERHADAP DEGRADASI HIDROLITIK BENANG BEDAH SINTETIS BERBASIS POLI(GLIKOLAT-KO-LAKTAT) Sudaryanto Irhamni Siti Wardiyati Biodegradabel Benang Bedah Degradasi pH Telah dilakukan studi in vitro tentang pengaruh pH terhadap proses degradasi hidrolitik benang bedah sintesis berbasis kopolimer poli(glikolat-ko-laktat). Pengujian dilakukan dengan cara inkubasi dalamlarutan penyangga dengan nilai pH 4, pH 7 dan pH 10 selama beberapaminggu pada suhu 37 oC. Perubahan strukturmikro dan morfologi diamati dengan peralatan Scanning Electron Microscope (SEM), dan X-Ray Diffraction (XRD). Hasil penelitian menunjukkan bahwa kecepatan degradasi hidrolitik benang bedah dipengaruhi oleh kondisi pH lingkungan, yang mana semakin tinggi pH semakin cepat proses degradasi. Pada pH 4 proses degradasi benang bedah tampak nyata setelah inkubasi selama 9 minggu sedangkan pada pada pH 10 setelah 4 minggu. Proses degradasi diiringi dengan kenaikan kristalinitas benang yang tampak nyata terutama pada pH 4. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5865 10.17146/jsmi.2008.9.3.4686 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 189-192 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5865/4303 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5866 2026-10-30T03:41:57Z jsmi:ART

KARAKTERISTIK TERMAL POLIESTER MIKROBIAL POLI(HIDROKSIBUTIRAT) Meri Suhartini Rahmawati Poliester Poli(hidroksibutirat) Radiasi Entalpi Penggabungan Kopolimer P(3HB-ko-4HB) Ikatan silang Karakteristik Termal Poliester Mikrobial Poli(hidroksibutirat). Tujuan penelitian ini adalah untuk mengetahui karakteristik termal dan pengaruh radiasi pada poliester poli(hidroksibutirat). Karakterisasi yang dilakukan meliputi suhu leleh, densitas, kristalinitas, entalpi penggabungan, distribusi rangkaian dan pengaruh radiasi pada kopolimer poli(hidroksibutirat). Hasil yang diperoleh menunjukkan bahwa karakteristik termal kopolimer mengalami perubahan signifikan dengan berubahnya komposisi kopolimer. Densitas kopolimer meningkat secara linier dengan naiknya kandungan 4HB. Entalpi penggabungan kopolimer, ΔHu P(3HB-ko-4HB), sebesar 76 Jg-1. Rangkaian 4HB terpanjang yang tergabung dalam kopolimer P(3HB-ko-4HB) adalah pada komposisi 4HB 68 %mol hingga 78%mol. Radiasi P(4HB) pada kondisi vakumdan udara bebas menyebabkan degradasi yang cukup nyata, yaitu lebih dari 50%. Ikatan silang yang ditandai dengan pembentukan gel terjadi pada P(4HB) yang diradiasi dengan dosis lebih dari 105 kGy pada kondisi vakum. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5866 10.17146/jsmi.2008.9.3.4687 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 193-199 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5866/4304 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5867 2026-10-30T03:41:57Z jsmi:ART

PEMBUATAN SERAT POLIESTER KEKUATAN TINGGI DAN KARAKTERISASI TERHADAP SIFAT FISIK DAN SUPERMOLEKULERNYA Zubaidi Serat poliester kekuatan tinggi Modifikasi supermolekuler Penelitian pembuatan serat poliester kekuatan tinggi dan karakterisasinya telah dilakukan melalui modifikasi supermolekuler menggunakan pemanasan, penarikan, pendinginan mendadak. Serat poliester dengan orientasi dan kristalinitas rendah dimodifikasi dengan cara pemanasan dengan variasi suhu, penarikan dengan variasi panjang (draw ratio), pemanasan dan pendinginan mendadak serta pengulangannya untuk mendapatkan kristalinitas dan orioentasi yang berbeda. Dari hasil beberapa pengujian dapat disimpulkan bahwa gabungan perlakuan pemanasan, penarikan dan pendinginan mendadak yang dilakukan berulang pada suhu yang lebih tinggi akan menghasilkan bentuk kristalin dan orientasi yang paling tinggi. Makin tinggi kristalinitas, makin tinggi kekuatan dan kestabilan dimensinya, tetapi persen mulur cenderung berkurang. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5867 10.17146/jsmi.2008.9.3.4688 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 200-203 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5867/4305 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5869 2026-11-02T02:59:30Z jsmi:ART

CHARACTERIZATION AND ELECTROCHEMISTRY OF LiFePO4 BY SONICATIONHYDROTHERMAL METHODS Wagiyo Honggowiranto Evvy Kartini Lithium-ion Battery LiFePO4 cathoda Sonication Hydrothermal CHARACTERIZATION AND ELECTROCHEMISTRY OF LiFePO4 BY SONICATIONHYDROTHERMAL METHODS. Cathode materials of LiFePO4 for rechargeable-lithium ion battery were synthesized by combination of sonication and hydrothermal method. The reaction has been carried out by mixing of FeSO4.7H2O, H3PO4, LiOH and ethylene glycol. The mixtures were sonicated by ultrasonic prior to a hydrothermal process. The crystal structure, microstructure and electrical properties of LiFePO4 products were characterized by usingX-ray diffraction (XRD), a Scanning ElectronMicroscope (SEM), and an Impedance Spectroscopy, respectively. The X-ray data showed that the crystal structure of LiFePO4 belongs to the P m n a space group (olivine structure). The crystalline size of sample non-sonic, sonic and commercial LiFePO4 were 730.2; 3068.0 and 639.4 Å, respectively. Performances of half cell batteries were measured by Impedance spectroscopy and by using Battery Analyzer BST-8.The EIS data from half cell batteries of nonsonic, sonic and commercial LiFePO4 were 269.92; 149.85 and 106.2 Ω, respectively. Meanwhile, the specific capacities at 0.1C of non-sonic, sonic and commercial LiFePO4 were 98.70; 120.17 and 125.23 mAh/g, respectively.As confirmed by SEM image, the particle distribution of sonic-LiFePO4 were more homogenous, and had properties similar to the commercial ones. It is concluded that the sonication procedure carried out prior to hydrothermal has improved performance of the lithium ion battery. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5869 10.17146/jsmi.2016.17.2.4202 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 49-55 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5869/4309 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5870 2026-10-30T03:41:57Z jsmi:ART

KARAKTERISASI SELULOSA MIKROBIAL YANG DIMODIFIKASI DENGAN TEKNIK KOPOLIMERISASI CANGKOK Tita Puspitasari Cynthia Linaya Radiman Kopolimerisasi cangkok Modifikasi Radiasi Selulosa mikrobial Modifikasi kimia dan fisika polimer dapat dilakukan dengan kopolimerisasi cangkok yang diinisiasi dengan radiasi. Penelitian ini dilakukan untuk mempelajari morfologi dan kristalinitas kopolimer selulosa mikrobial yang dicangkok dengan asam akrilat (SM-g-AAc). Analisis struktur mikro SEM membuktikan bahwa asam akrilat mampu berdifusi ke dalam lapisan selulosa mikrobial dan mengakibatkan struktur porinya menjadi lebih rapat. Pengukuran kristalinitas menunjukkan bahwa kristalinitas selulosa mikrobial setelah dimodifikasi naik dari 50% menjadi 53%. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5870 10.17146/jsmi.2008.9.3.4689 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 204-207 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5870/4306 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5871 2026-10-30T03:41:57Z jsmi:ART

PENGARUH IRGANOK 245 TERHADAP KRISTALINITAS DAN KESTABILAN MEKANIK POLIPADUAN POLIPROPILEN-NATURAL RUBBER Mashuri Kristiawan Setia H Darminto Aloma K. K Sudirman Polipaduan Anti oksidan Irganok 245 Tensile strength Elongation at break Telah dilakukan studi pengaruh irganok 245 terhadap kristalinitas dan kestabilan kekuatan tarik polipaduan polipropilen (PP)-Natural Rubber (NR) yang mengalami penjemuran selama 12 minggu di alam terbuka. Untuk mengamati peran anti oksidan dalam menghambat terjadinya reaksi oksidasi pada polipaduan PP-NR (4:1) digunakan Irganok 245 dengan konsentrasi 4%vol, 6%vol, 8%vol dan 10%vol. Polipaduan dibuat dengan metode blending pada suhu 170oC dengan rotasi 30 rpm selama 10 menit. Hasil penelitian menunjukkan irganok 245 sebagai anti oksidan tidak berpengaruh terhadap tingkat kekompakan (misibilitas) polipaduan PP-NR dan termasuk jenis immiscible blends. Konsentrasi optimal irganok 245 sebagai anti oksidan yang berperan menghambat reaksi oksidasi pada polipaduan PP-NR yangmengalami penjemuran selama 12 minggu di alam terbuka sebesar 8%vol. Polipaduan PP-NR-irganok 245 8% mengalami penurunan tensile strength sebesar 6% dan peningkatan elongation at break sebesar 50% dalam penjemuran selama 8 minggu sedangkan hingga penjemuran 12 minggu terjadi penurunan yang drastis. Kestabilan kekuatan tarik polipaduan PP-NR menjadi lebih baik dengan adanya Irganok 245 sebesar 8%vol yang ditandai dengan lambat terbentuknya cacat garis, cacat bidang dan cacat ruang serta penurunan kristalinitas yang hanya 9% pasca penjemuran selama 12 minggu BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5871 10.17146/jsmi.2008.9.3.4690 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 208-213 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5871/4307 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5872 2026-10-30T03:41:57Z jsmi:ART

PENGARUH IRADIASI GAMMA TERHADAP SIFAT MEKANIK KARET ALAM DAN CAMPURAN KARET ALAM-POLIETILEN VULKANISAT Sudradjat Iskandar Iradiasi Sinar gamma Sifat mekanik Karet alam Campuran karet alam-polietilen Vulkanisat Untuk meningkatkan kualitas karet alam dan campuran karet alam-polietilen vulkanisat, telah dilakukan iradiasi gamma. Kompon karet alam dan campuran karet alam-polietilen dibuat denganmenggunakanmesin pencampur dua roll. Bahan pencampur adalah antioksidan, antiozon, plasticizer, dan vulkanisator. Kompon karet alam dan campuran karet alam-polietilen selanjutnya divulkanisasi dan dibuat slab (benda uji) dengan menggunakan mesin pres panas dan pres dingin. Slab yang terbentuk kemudian diiradiasi dengan sinar gamma dari sumber Cobalt-60 pada dosis iradiasi 75 kGy, 150 kGy dan 300 kGy. Pengaruh iradiasi terhadap modulus 300, kekuatan tarik, perpanjangan putus dan ketahanan sobek karet alam dan campuran karet alam-polietilen vulkanisat dikarakterisasi dengan alat uji tarik strograph R1. Hasil penelitianmenunjukkan bahwa modulus 300 dan kekerasan karet alamdan campuran karet alam-polietilen vulkanisat bertambah, sedangkan kekuatan tarik dan ketahanan sobeknya bertambah sampai maksimum pada dosis tertentu kemudian berkurang dengan bertambahnya dosis iradiasi. Sifat perpanjangan putus karet alam dan campuran karet alam-polietilen vulkanisat cenderung berkurang dengan bertambahnya dosis iradiasi. Kekuatan tarik maksimum karet alam dan campuran karet alam-polietilen vulkanisat dicapai pada dosis iradiasi 75 kGy. Pada dosis iradiasi 75 kGy, kekuatan tarik karet alam vulkanisat dapat ditingkatkan dari 17,6MN/m2 menjadi 21,2MN/m2, sedangkan kekuatan tarik campuran karet alam-polietilen vulkanisat sedikit meningkat dari 18,7 MN/m2 menjadi 19,4 MN/m2. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5872 10.17146/jsmi.2008.9.3.4693 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 214-219 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5872/4308 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5873 2026-10-30T03:41:57Z jsmi:ART

KARAKTERISASI FISIK LIPOSOM ASAM SALISILAT MENGGUNAKAN MIKROSKOP ELEKTRON TRANSMISI Elman Panjaitan Liposom Asam salisilat TEM Telah dilakukan karakterisasi fisik liposom yang diformulasikan dari asam salisilat dengan metode lapis tipis berbahan dasar lesitin kedelai dan kolesterol. Formula yang terbentuk diamati menggunakan mikroskop optik dan Transmission Electron Microscope (TEM). Hasil penelitian menunjukkan bahwa asam salisilat dapat diformulasikan dalam liposom. Kombinasi lesitin kedelai dan kolesterol (600 mg : 20 mg) merupakan formula terbaik, liposom berbentuk vesicle sferis dan berukuran 70 nm sampai dengan 800 nm. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5873 10.17146/jsmi.2008.9.3.4702 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 226 - 229 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5873/4310 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5874 2026-10-30T03:41:57Z jsmi:ART

PELAPISAN PARKET BLOK JATI (TECTONA GRANDIS L.f.) DENGAN POLIMER EPOKSI AKRILAT MENGGUNAKAN IRADIASI ULTRA VIOLET Darsono Sugiarto Danu Parket blok jati Epoksi akrilat Iradiasi Ultra Violet Telah dilakukan pelapisan parket blok jati (Tectona Grandis L.f.) dengan bahan pelapis resin epoksi akrilat dengan nama komersial Laromer EA-81. Resin epoksi akrilat dipakai sebagai bahan pelapis setelah dicampur dengan monomer tripropilen glikol diakrilat (TPGDA) dan fotoinisiator Darocur 1173. Parket blok setelah dilapisi kemudian diiradiasi sinar UV dengan variasi kecepatan konveyor : 2 m/menit, 3 m/menit, 4 m/menit, dan 5 m/menit. Parameter yang diamati meliputi kilap, adesi, kekerasan, ketahanan kikis dan ketahanan terhadap bahan kimia, pelarut dan noda. Hasil yang diperoleh menunjukkan bahwa lapisan epoksi akrilat mempunyai adesi yang baik terhadap permukaan kayu, kekerasan, ketahanan kikis, kilap yang tinggi dan juga tahan terhadap bahan kimia, pelarut dan noda, kecuali terhadap natrium hidroksida 10 %. Bahan pelapis epoksi akrilat formulasi II (kandungan TPGDA 30%w/w)menghasilkan lapisan lebih baik dari formulasi I (kandungan TPGDA 20 %w/w), ditinjau dari segi penampilan, maupun sifat lapisan. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5874 10.17146/jsmi.2008.9.3.4704 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 230 - 235 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5874/4311 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5877 2026-11-02T04:04:41Z jsmi:ART

CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF PSEUDOBROOKITE Fe2-XNiXTiO5 SYSTEM (x = 0, 0.1, 0.2, 0.3, 0.5 and 1) Yosef Sarwanto Wisnu Ari Adi Pseudobrookite Fe2-xNixTiO5 Substitution Crystal structure Magnetic Crystallographic structure and magnetic properties of pseudobrookite Fe2-xNixTiO5 system (x = 0, 0.1, 0.2, 0.3, 0.5 and 1) have been performed through solid state reaction. Pseudobrookite Fe2-xNixTiO5 system was synthesized by mixing of Fe2O3, NiO, and TiO2 with stoichiometry composition using wet mill. The mixture was milled for 5 hours and sintered in the electric chamber furnace at 1000 oC in the air at atmosphere pressure for 5 hours. The refinement against of X-ray diffraction data shows that the sampless with composition of (x = 0) and (x = 0.1) have a single phase with Fe2TiO5 structure. However the samples with composition of (x > 0.1) consist of multiple phases, namely Fe2-xNixTiO5, FeTiO3, Fe2NiO4 and NiO. Particle morphologies of the composition x = 0 and x = 0.1 are homogenous and uniform on the sample surface with a polygonal particle shape and particle size varies. At room temperature, the sample with x=0 is paramagnetic and that with x=0.1 is ferromagnetic. Magnetic phase transformation of this study is the caused by the present of Ni substituted Fe in the system. Thus substitution Ni into Fe on the system pseudobrookite Fe2TiO5 only capable of 0.1 at.% without changing the crystal structure of the material. It means that there is an interaction between the magnetic spin Fe3+ on the 3d5 configurations and Ni2+ on the 3d3 configurations through the mechanism of double exchange. Double exchange mechanism is a magnetic type of exchange that appears between the ions Fe3+ and Ni2+ adjacent in different oxidation states. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5877 10.17146/jsmi.2018.19.2.4144 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 47-53 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5877/4315 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5878 2026-11-02T03:48:47Z jsmi:ART

PENGARUH KADAR AIR DAN JENIS TANAH TERHADAP PENYEDIAAN ARUS SISTEM IMPRESSED CURRENT CATHODIC PROTECTION UNTUK PROTEKSI KOROSI PIPA BAJA Tubagus Noor Rohmannudin Sulistijono Arini Resistivitas tanah Kadar air ICCP Pipa baja PENGARUH KADAR AIR DAN JENIS TANAH TERHADAP PENYEDIAAN ARUS SISTEM IMPRESSED CURRENT CATHODIC PROTECTION UNTUK PROTEKSI KOROSI PIPA BAJA.Faktor lingkungan yang menjadi salah satu indikator utama terhadap korosi pada tanah adalah resistivitas dankadar air tanah. Tujuan penelitian adalah untuk menganalisis pengaruh resistivitas dan kadar air tanah terhadapkebutuhan arus proteksi sistem ICCP pada material pipa API 5L Grade B sebagai katoda yang yang diberivariasi coating (coating seluruhnya, tanpa coating dan cacat gores berbentuk persegi dengan luas 500 mm2).Variasi kadar air adalah 0% (kondisi kering) dan 25%.Anoda menggunakan grafit,rectifiernya sebagai penyearaharus dan elektroda referensi Cu/CuSO4 sebagai elektroda acuan. Pengukuran arus proteksi ini dilakukan selama7 hari dengan pengambilan data setiap hari. Dari hasil penelitian terlihat bahwa dengan bertambahnya kadar airdalam tanah akan menyebabkan nilai resistivitas tanah menurun, karena bertambahnya jumlah air dalam tanahakan mempermudah aliran arus. Nilai resistivitas tanah yang semakin tinggi akan membutuhkan arus proteksiyang rendah karena pada tanah dengan nilai resistivitas tinggi memiliki tahanan yang tinggi (lemah menghantarlistrik atau bersifat isolator). Sedangkan dengan kadar air tanah yang tinggi nilai arus proteksi semakin meningkatkarena air mempermudah ionisasi elektron dalam tanah sehingga mempermudah aliran arus BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5878 10.17146/jsmi.2017.18.2.4163 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 49-54 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5878/4313 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5883 2026-11-02T04:04:41Z jsmi:ART

EFEK SUBSTITUSI Fe2+ DAN Fe3+ TERHADAP STRUKTUR KRISTAL, SIFAT OPTIK DAN MAGNETIK PADA NANOPARTIKEL ANATASE Ti1-d(d %Fe)O2 Wisnu Ari Adi Adel Fisli TiO2 anatase nanopartikel modifikasi struktur kristal sifat optik dan magnetik Bahan penyerap gelombang elektromagnetik sekarang ini menjadi kajian yang sangat menarik untuk dipelajari lebih mendalam karena sifatnya yang unik ditinjau dari interaksinya dengan gelombang elektromagnetiknya itu sendiri. Syarat utama yang harus dipenuhi sebagai bahan penyerap gelombang elektromagnetik adalah bahwa bahan tersebut harus memiliki karakteristik dielectric loss dan magnetic loss yang tinggi. Anatase TiO2 merupakan bahan dielektrik yang baik namun bahan ini adalah diamagnetic. Substitusi Fe ini diharapkan dapat merekayasa sifat magnetic bahan ini. Modifikasi dari TiO2 anatase ini dibuat dengan metode presipitasi melalui prosedur sebagai berikut: 25 mL larutan garam besi 0,3M Fe2+ dan 0,3M Fe3+ (rasio mol 2:1) masing-masing dicampurkan ke dalam 50 mL larutan 3 M TiCl4. Larutan campuran titanium dan besi ini ditambahkan larutan 150 mL amonia 2,5 M dengan laju tetes 3 ml/menit. Setelah itu endapan yang terbentuk dicuci kemudian dipanaskan dalam oven dan dikalsinasi pada 500 oC selama 3 jam. Ada dua jenis sampel anatase yang diperoleh yaitu Ti1-d(d %Fe3+) dan Ti1-d(d %Fe2+) dimana (d = 0; 0,5; 1; dan 5 % berat). Identifikasi fasa diukur dengan difraksi sinar-X dan struktur Kristal dianalisis dengan menggunakan metode Rietveld. Hasil refinement menunjukkan bahwa sampel memiliki struktur kristal tetragonal fasa tunggal anatase TiO2. Atom Fe telah berhasil tersubstitusi ke dalam Ti tanpa merubah struktur Kristal bahan ini. Sementara berdasarkan hasil analisis sifat optik dan magnetik menunjukkan bahwa pengaruh substitusi baik Fe2+ maupun Fe3+ telah berhasil menurunkan energy band gapnya dan dapat mentransformasi fasa magnetic bahan ini dari diamagnetik menjadi paramagnetik di suhu kamar. Disimpulkan bahwa telah berhasil dilakukan rekayasa material bahan anatase TiO2 dengan substitusi hingga 5% berat baik ion Fe2+ maupun Fe3+ ke dalam ion Ti4+ dengan metode presipitasi. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5883 10.17146/jsmi.2018.19.2.4151 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 54-60 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5883/4317 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5885 2026-11-02T04:04:41Z jsmi:ART

STUDI PENGARUH WAKTU DAN KECEPATAN PENGADUKAN TERHADAP KARAKTERISTIK PRODUK WHITE COLORANT DARI TITANIUM DIOKSIDA (TiO2) Ratnawati Linda A. Yoshi Zaenal K Andri Y White colorant Titanium dioksida Pengadukan White Colorant adalah bahan baku utama dalam proses pembuatan cat di depo yang dibuat dari pigment TiO2. Proses pembuatan white colorant memerlukan waktu dan energi pengadukan yang besar untuk mencampurkan bahan seperti binder, pigment, solvent dan zat aditif. Penelitian ini bertujuan untuk mendapatkan waktu dan kecepatan pengadukan yang optimal dari pencampuran bahan-bahan yang diperlukan agar diperoleh white colorant dari pigment TiO2 yang memenuhi spesifikasi yang diinginkan oleh Pabrik cat di Tangerang. Variasi yang dilakukan adalah kecepatan pengadukan (1000, 1100 dan 1200) rpm dan waktu pengadukan (10, 15, 20, 25 dan 30) menit. Hasil optimum yang didapatkan adalah ukuran partikel TiO2 sebesar 15 µm, viskositas 1900 cPs, total padatan 81,81%, warna DE 0,49 dan CR 98,12% pada kondisi kecepetan pengadukan 1200 rpm dan waktu 15 menit. Hasil ini sesuai dengan spesifikasi standard pabrik cat, yaitu ukuran partikel 10 µm hingga 30 µm, viskositas 1000 cPs hingga 6000 cPs, total padatan 79 % hingga 83%, warna DE sebesar 0,5, dan warna CR sebesar 80 % hingga 100%. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5885 10.17146/jsmi.2018.19.2.4132 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 61-65 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5885/4320 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5889 2026-11-02T04:04:41Z jsmi:ART

PEMBUATAN DAN KARAKTERISASI KOMPOSIT BIOPLASTIK BERBASIS FILLER CELLULOSE MICRO FIBERS RAMI Edi Syafri Anwar Kasim Hairul Abral Alfi Asben Sudirman CMF Rami Pati tapioka Bioplastik Komposit Pada penelitian ini telah diproduksi dan dikarakterisasi komposit bioplastik dari partikel selulosa serat rami (Cellulose Micro Fibers/CMF) untuk memperkuat komposit bioplastik bermatriks pati tapioka. CMF rami diproduksi menggunakan metode milling (CMFM) dan ultrasonikasi (CMFU) dengan ukuran masing-masing adalah 3,51 µm dan 0,388 µm. Pembuatan dan karakterisasi komposit bioplastik dilakukan dengan metode casting menggunakan gliserol sebagai plastisizer, dan penambahan filler CMF rami. Sifat fisik, kekuatan tarik, struktur dan termal komposit bioplastik dikarakterisasi menggunakan SEM, UTM, XRD, dan DSC. Hasil pengujian menunjukkan bahwa ukuran dan konsentrasi CMF secara signifikan mempengaruhi fisik bioplastik komposit. Dari hasil SEM menunjukkan bahwa filler CMF berinteraksi dengan matriks pati tapioka, dimana bioplastik dengan CMF rami berukuran kecil memperlihatkan struktur kompak dan permukaan yang lebih homogen. Nilai optimum kekuatan tarik terjadi pada penambahan 8% (w/w) CMF rami dari hasil ultrasonikasi dan milling masing-masing meningkat menjadi 3,31MPa dan 2,71MPa dari 1,64 MPa. Sebaliknya pada sifat termal sedikit berpengaruh dengan penambahan CMF rami. Analisis Difraksi Sinar-X menunjukkan kristalinitas komposit bioplastik meningkat dengan penambahan CMF rami dari 8,65 % menjadi 20,21 % untuk CMFM dan 15,12% untuk CMFU. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5889 10.17146/jsmi.2018.19.2.4146 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 66-71 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5889/4326 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5893 2026-11-02T04:04:41Z jsmi:ART

EFFECT OF CONCENTRATION OF IMPERATA CYLINDRICA L LEAF EXTRACT ON SYNTHESIS PROCESS OF GOLD NANOPARTICLES Iwan Syahjoko Saputra Yoki Yulizar Sudirman Imperata cylindrica L Gold Nanoparticles (GoldNPs) Green Synthesis Gold Nanoparticles (GoldNPs) successful was performed using HAuCl4 precursor as Au3+ ion source with 7x10-4 M concentration. The research aims to knows effect of concentration variation of Imperata cylindrica L leaf extract on synthesis process of gold nanoparticles. The research used of green synthesis method. Colloid of nanoparticles which is formed in analyzed using UV-Vis Spectrophotometer, FT-IR Spectroscopy, PSA, PZC, XRD and TEM. The results of synthesis showed the best concentration of Imperata cilindrica L leaf extract at 3,46%, happen a shift of wavelength at UV-Vis from 216 nm to 530 nm with 1.779 absorbance value. The PSA analysis showed a particle size of 51.87 nm and a PZC value of -19.2 mV. The result of FT-IR indicated a shift of wavenumber in the hidroxyl group from 3354 cm-1 to 3390 cm-1 and showed a interaction of hydroxyl group at imperata cylindrica L leaf extract with Au3+ ion. TEM analysis shows the morphology of GoldNPs that spherical shape with a particle size of 20 nm. XRD calculation results show crystallite size of gold nanoparticles is 15.47 nm. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5893 10.17146/jsmi.2018.19.2.4135 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 72-76 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5893/4329 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5894 2026-11-02T03:48:47Z jsmi:ART

KARAKTERISTIK HIDROGEL SELULOSA/POLIVINIL ALKOHOL UNTUK ABSORPSI LOGAM BERAT Ambyah Suliwarno Prasetyo Bayu Aji Hidrogel selulosa/PVA Ion logam berat KARATERISTIKHIDROGELSELULOSA/POLIVINILALKOHOLUNTUKABSORPSILOGAM BERAT. Dalam rangka pendayagunaan teknologi iradiasi serta pemanfaatan biomasa dan limbahnya, telah disintesis hidrogel selulosa/polivinil alkohol (selulosa/PVA)melalui kopolimerisasi dan ikatan silang hasil induksi iradiasi sinar- pada dosis 10 dan 20 kGy. Hidrogel dengan total persen berat (b/b) sebesar 10 %,15 % dan 20%, tersusun dari PVA dan serbuk selulosa dari kayu jeunjing /sengon laut (albazia falcataria) ukuran partikel 40 mesh dengan masing-masing komposisi optimal.Dalam penggunaannya sebagai bahan absorben logamberat, hidrogel selulosa /PVA dikarakterisasi sifat fisik; fraksi gel dan persen pengembangan, serta morfologi permukaan dengan Scanning Electron Microscope (SEM). Pada percobaan ini, larutan ion logam Ag(I), Cu (II), dan Fe (II) pada konsentrasi masing-masing 1500 ppm, dengan variasi derajat keasaman (pH) antara 2 hingga 7 dilakukan perendaman hidrogel selulosa /PVA hingga 24 jam. Sisa ion logam ditentukan dengan spektrofotometer serapan atom (AAS) pada selang waktu tertentu. Hasil percobaan menunjukkan bahwa pada pH rendah, daya absorpsi hidrogel selulosa/PVA dari hasil optimal (15%, 20 kGy) terhadap ion logamsangat kecil, danmeningkat dengan naiknya pH hingga 7. Hasil pengamatan menunjukkan penyerapan ion logamoleh hidrogel selulosa /PVA terjadi melalui pembentukan ikatan antara ion logamberat dengan gugus akrilat (khelat) dan mengikuti kinetika isothermal Langmuir pseudo orde-2. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5894 10.17146/jsmi.2017.18.2.4164 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 55-60 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5894/4328 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5896 2026-11-02T03:48:47Z jsmi:ART

PENGARUH RASIO MASSA KITIN/NaOH DAN WAKTU REAKSI TERHADAP KARAKTERISTIK KITOSAN YANG DISINTESIS DARI LIMBAH INDUSTRI UDANG KERING Ahmad Fadli Drastinawati Ongky Alexander Feblil Huda Deasetilasi Demineralisasi Deproteinasi Kitin Kitosan PENGARUH RASIO MASSA KITIN/NaOH DAN WAKTU REAKSI TERHADAP KARAKTERISTIK KITOSAN YANG DISINTESIS DARI LIMBAH INDUSTRI UDANG KERING. Kitosan merupakan polimer yang dapat dibuat dari kitin menggunakan proses deasetilasi. Tujuan penelitian ini untuk mempelajari pengaruh rasio massa kitin dengan volume NaOH dan waktu reaksi terhadap karakteristik kitosan yang disintesis dari limbah industri udang kering. Kitin diisolasi dari cangkang udang dengan metode deproteinasi dan demineralisasi. Deasetilasi kitin dilakukan pada suhu 120 °C, kecepatan pengadukan 150 rpm, rasio massa kitin dengan volume NaOH 1:15, 1:20, 1:25 (w/v), dan waktu reaksi 0,5-3 jam. Hasil penelitian menunjukkan bahwa peningkatan nilai rasio massa kitin dengan volume NaOH terhadap waktu reaksi mengakibatkan peningkatan derajat deasetilasi dan penyusutan kadar abu dan rendemen kitosan, sedangkan kadar air tidak memiliki efek yang signifikan. Derajat deasetilasi kitosan adalah 85,7% pada rasio massa kitin dengan volumeNaOH 1:15 selama 3 jamdanmeningkatmenjadi 86,1%setelah rasiomassa kitin dengan volume NaOH ditingkatkan menjadi 1:25. Kadar rendemen berkisar antara 86,6 % hingga 63,5 %, kadar air kitosan berkisar antara 1,2 % hingga 1,0 %, dan kadar abu kitosan berkisar antara 1,9 % hingga 1,1 %. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5896 10.17146/jsmi.2017.18.2.4166 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 61-67 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5896/4332 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5897 2026-11-02T04:04:41Z jsmi:ART

SINTESIS METIL ESTER SULFONAT MELALUI SULFONASI METIL ESTER MINYAK KEDELAI UNTUK APLIKASI CHEMICAL FLOODING Richie Adi Putra Renisa Ismayanti Agam Duma Kalista W Surfaktan IFT Metil Ester Sulfonat (MES) Methyl Soyate Pada penelitian ini telah dilakukan sintesis Metil Ester Sulfonat (MES)dari bahan baku yaitu Methyl Soyate dengan NaHSO3 sebagai agent pensulfonasi. Tahapan proses untuk sintesis Metil Ester Sulfonat yaitu reaksi sulfonasi, pemurnian, penetralan dan pemisahan. Reaksi sulfonasi dilakukan pada beberapa kondisi proses yaitu, suhu reaksi 100 °C, 110 °C, 120 °C, waktu reaksi 210 menit, 270 menit, 330 menit dan rasio mol reaktan antara metil ester dengan NaHSO3 (1:1,1:1,5,1:2) dengan katalis Al2O3 1,5% pada reaksi sulfonasi. Pemurnian dilakukan pada 55 °C dan 60 menit dengan penambahan metanol 35 %(v/v). Penetralan dilakukan dengan NaOH 20% sampai pH6-8. Metanol sisa pada Metil Ester Sulfonat kemudian dipisahkan menggunakan rotary evaporator. MES yang dinyatakan memenuhi uji kompabilitas yaitu MES pada variabel (100 °C, 210 menit dan rasio mol 1:2). Selanjutnya dilakukan uji FT-IR untuk melihat terbentuknya gugus sulfonat. Pada hasil uji FT-IR gugus sulfonat terbentuk pada spektrum panjang gelombang antara (1000-1300) cm-1 dimana puncak tertinggi terdapat pada panjang gelombang 1176 cm-1. Dari hasil uji kualitatif tersebut kemudian MES diuji secara kuantitatif yaitu dengan pengujian IFT menggunakan bahan pembanding light oil lapangan X. Didapatkan penurunan tegangan permukaan antara brine water 12.000 ppm dengan light oil (lapangan X) dengan penambahan 0,3 %(v/v). MES dari sampel blanko sebesar 3,36 dyne/cm2 menjadi 1,54 dyne/cm2. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5897 10.17146/jsmi.2018.19.2.4145 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 77-82 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5897/4331 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5899 2026-11-02T04:04:41Z jsmi:ART

SINTESIS DAN KARAKTERISASI ELEKTROLIT Ce0,9Gd0,1-XNdXO1,90 UNTUK APLIKASI SEL BAHAN BAKAR PADATAN SUHU SEDANG Jarot Raharjo Damisih Ade Utami Hapsari Masmui Putri Purnama Yanti Ce0,9Gd0,1O0,195 terdoping Nd2O3 Komposit elektrolit Konduktivitas ionik Elektrolit berbasis serium seperti GDC10 telah banyak dikembangkan untuk aplikasi sel bahan bakar oksida padatan suhu sedang atau yang dikenal dengan Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). Kodoping merupakan salah satu cara untuk meningkatkan konduktivitas elektrolit IT-SOFC. Tujuan dari penelitian ini adalah untuk mempelajari pengaruh penambahan kodopan neodimium (Nd) terhadap GDC10 (Ce0,9Gd0,1-xNdxO1,90) dengan rasio molar x = 0,025; 0,050; dan 0,075 terhadap sifat fisis dan elektrokimianya. Neodimium digunakan sebagai kodopan karena dapat menurunkan energi aktivasi, sehingga konduktivitas elektrolit meningkat. Metode sintesis yang digunakan adalah sol gel untuk menghasilkan serbuk GDC terdoping Nd, setelah itu serbuk dibuat pelet. Sampel dikarakterisasi dengan menggunakan X-Ray Diffraction (XRD) untuk mengidentifikasi fasa, Scanning Electron Microscope (SEM) untuk melihat morfologi dan Thermal Gravimetric Analysis (TGA) untuk melihat stabilitas termalnya. Dari hasil penelitian, kalsinasi pada suhu 700 oC selama 5 jam dan sintering pada suhu 1350 oC selama 2 jam diperoleh densitas pelet elektrolit lebih besar dari 95%. Hal ini telah memenuhi syarat sebagai elektrolit sel bahan bakar padatan yang baik. Keseluruhan sampel memiliki struktur kubik dengan ukuran kristal antara 4,26 nm hingga 4,47 nm. GDC10 terdoping neodimium dengan rasio molar x = 0,025 (GDC-Nd0,025) memiliki konduktivitas tertinggi yaitu 0,055 S/cmpada suhu 600 oC. Hasil tersebut menunjukkan bahwa kodoping dapat meningkatkan konduktivitas sel elektrolit GDC untuk aplikasi sel bahan bakar oksida padatan suhu sedang. BRIN Publishing (Penerbit BRIN) 2018-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5899 10.17146/jsmi.2018.19.2.4141 Jurnal Sains Materi Indonesia; Vol. 19 No. 2 (2018): Jurnal Sains dan Materi Indonesia; 83-90 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5899/4334 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5900 2026-11-02T03:48:47Z jsmi:ART

HYDRIDE FORMATION KINETICS ON GASEOUS HYDRIDING OF ZIRCALOY-4 USING AVRAMI EQUATION Hadi Suwarno Rohmad Sigit Zircaloy-4 Kinetics Hydriding Hydride phase AVRAMI HYDRIDE FORMATION KINETICS ON GASEOUS HYDRIDING OF ZIRCALOY-4 USING AVRAMI EQUATION. Zirconium alloys are mainly material for fuel cladding. Mechanical properties degradation of zircaloy-4 as nuclear fuel cladding is inevitable due to its interaction with hydrogen during normal reactor operation or transient condition. Kinetics analyses of Zircaloy-4 cladding materials at operating temperatures of 500, 550 and 600 oC under hydrogen atmosphere by using Avrami’s method to simulate brittle hydride phase formation and physical observation of the cladding after hydriding have been performed in order to observe the cladding to hydrogen interaction. Kinetic analyses showed that hydriding reaction rate follows the second order with activation energy of 35 kJ/mol. The formation of ε-ZrH phase, an indication of the physical degradation of the tubes, consumed time of 180 minutes at a temperature of 500 oC, 150 minutes at 550 oC, and 100 minutes at 600 oC, respectively. Degradation mechanical properties could be seen visually on the higher hydriding temperature. The cladding materials showed that the tube swelling occurs at a temperature of 550 oC and the tube degraded into pieces occurs at 600 oC. The value of mechanical degradation will be determined by mechanical testing in the next research. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5900 10.17146/jsmi.2017.18.2.4167 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 68-73 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5900/4335 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5902 2026-11-02T03:48:47Z jsmi:ART

TEKNOLOGI EKSTRAKSI FLUIDA SUPERKRITIS DAN MASERASI PADA ZINGIBER OFFICINALLE ROSCOE : AKTIVITAS ANTIOKSIDAN DAN KANDUNGAN FITOKIMIA Dewi Sondari Eka Dian Puspitasari Ekstraksi CO2 superktritis Rendemen Zingiber officinale Rosc Flavonoid Phenol TEKNOLOGI EKSTRAKSI FLUIDA SUPERKRITIS DAN MASERASI PADA ZINGIBER OFFICINALLE ROSCOE : AKTIVITAS ANTIOKSIDAN DAN KANDUNGAN FITOKIMIA. Proses ekstraksi Zingiber officinale Roscoe denganmetode fluida superkritis dan metodemaserasi sebagai pembanding telah dilakukan. Ekstraksi CO2 superkritis dilakukan pada kondisi proses tekanan 12-16 MPa, suhu 20-40 oC, waktu ekstraksi 2-6 jam dan laju alir fluida CO2 superkritis 5,5 mL/menit. Pengaruh proses ekstraksi terhadap rendemen, aktivitas antioksi dan dan kandungan fitokimia dari Zingiber officinale Rosc telah diteliti. Hasil penelitian ekstrak kasar jahe menunjukkan bahwa rendemen tertinggi 2,99 mg/g diperoleh pada suhu 40 oC, tekanan 16 MPa dan waktu ekstraksi 6 jam, dengan kandungan fenol total 72,73 mg GEA/g ekstrak, flavonoid total 0,90 % (b/b) dan aktivitas antioksidan sebesar 63,66 μg/mL. Hasil ekstrak kasar jahe dengan metode maserasi dihasilkan rendemen 3,10 mg/g, dengan kandungan phenol total 76,68 mg GEA/g ekstrak, flavonoid total 1,18 % (b/b) dan aktivitas antioksidan sebesar 122,85 μg/mL. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5902 10.17146/jsmi.2017.18.2.4168 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 74-80 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5902/4337 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5903 2026-11-02T03:59:51Z jsmi:ART

SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li2O)x(P2O5)y Heri Jodi Anne Zulfia S. Agus Sudjatno Wahyudianingsih E. Kartini elektrolit padat Lithium Fosfat Electrochemical Impedance Spectroscopy konduktivitas dielektrik Bahan elektrolit padat (Li2O)x(P2O5)y dengan komposisi konten Li2O sebesar x = 24 %berat dan 28 %berat telah dipreparasi menggunakan teknik reaksi padat pada suhu di bawah suhu lelehnya.  Paduan yang telah dipreparasi kemudian dikarakterisasi menggunakan Scanning Electron Microscopy (SEM) dan Electrochemical Impedance Spectroscopy (EIS) untuk diperiksa morfologi, sifat elektrokimia dan konduktivitasnya. Karakterisasi elektrokimia menunjukkan bahwa nilai konduktivitas kedua paduan berada pada orde 10-6S/cm, setara dengan nilai konduktivitas paduan Li4P2O7 yang dipreparasi pada suhu lebih tinggi dengan kandungan Li2O lebih banyak, dan lebih tinggi dari konduktivitas senyawa Li3PO4. Taksiran nilai eksponen frekuensi dari formula konduktivitas AC, memperlihatkan bahwa kemungkinan sumber konduksi ion dalam bahan yang diamati salah satunya adalah aliran ion jarak jauh. Kurva rugi dielektrik menunjukkan bahwa konduksi dalam bahan elektrolit ini didominasi oleh konduksi DC. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5903 10.17146/jsmi.2017.19.1.4127 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 1-8 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5903/4338 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5908 2026-11-02T03:49:24Z jsmi:ART

STUDI PENGARUH VARIASI SUHU PERLAKUAN PANAS TERHADAP STRUKTURMIKRO DAN KOROSIFITAS PADA PELAPISAN SS 410 MENGGUNAKAN KOMPOSIT Ni-P-NANO PARTIKEL Al2O3 Yulinda Lestari Efendi Mabruri Anne Zulfia Syahrial Pelapisan Material Material plating Electroless Kodeposisi Electroless co-deposition Ni-P-Al2O3 Perlakuan panas Heat Treatment Struktur Mikro Microstructure Kristalinitas Crystalinity Ketahanan korosi Corrosion Resistance Pelapisan material Stainless Steel 410 dengan komposit Ni-P-nano powder Al2O3 menggunakan metode electroless kodeposisi sangat tergantung pada tingkat penggabungan lapisan komposit tersebut antara matriks Ni-P dan penguat nano partikel Al2O3 Hal ini berpengaruh pada keunggulan sifat lapisan komposit seperti ketahanan korosi yang baik, laju deposisi yang cepat, keseragaman deposit yang dihasilkan dan ketahanan kimia yang baik. Pada penelitian ini, parameter yang divariasi adalah suhu perlakuan panas setelah proses electroless kodeposisi. Penelitian ini bertujuan untuk mengetahui fenomena strukturmikro, fasa dan kristalinitas, komposisi kimia dan distribusi unsur di permukaan coating, dan ketahanan korosi komposit coating Ni-P-nano partikel powder Al2O3. Substrat yang digunakan yaitu Stainless Steel 410 di-pretreatment untuk mengaktivasi permukaan, kemudian direndam dalam larutan yang terdiri dari nikel sulfat, natrium hypophosphite, ammonium sulfat, sodium asetat, lead asetat dan serbuk nano alumina. Substrat direndam selama 60 menit, dalam suhu proses 90±2°C dengan kecepatan putaran 150 rpm. Karakterisasi sampel dilakukan menggunakan alat SEM-EDS, XRD, dan CMS. Dari hasil percobaan menunjukkan terdapat perbedaan visual permukaan substrat antara logam dasar, setelah proses electroless coating dan setelah perlakuan panas. Berdasarkan variabel percobaan, untuk suhu perlakuan panas yang optimum adalah 400°C, dimana terbentuk strukturmikro dari nodular menjadi butiran yang lebih teratur dan merata serta memiliki ketahanan korosi yang paling baik. BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5908 10.17146/jsmi.2017.18.3.4114 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 109-155 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5908/4342 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5909 2026-11-02T03:59:51Z jsmi:ART

THE 3 HOURS-HYDROTHERMAL SYNTHESIS OF HIGH SURFACE AREA SUPERPARAMAGNETIC Fe3O4 CORE-SHELL NANOPARTICLES Esty Octiana Sari Ahmad Fadli Amun Amri core-shell hydrothermal method superparamagnetic nanoparticles The monodisperse core-shell Fe3O4 nanoparticles have been successfully synthesized by short times (3 hours) hydrothermal method at 220oC from FeCl3, citrate, urea and PEG. The as-synthesized samples have been characterized using X-ray diffraction (XRD), Transmission Electron Mycroscopy (TEM), Bruneur-Emmet-Teller (BET) surface area analyzer, and Vibrating Sample Magnetometer (VSM). The XRD result showed the as-shinthesized products were pure Fe3O4.  The TEM image showed the magnetite nanoparticles have monodisperse core-shell shape. The BET result showed the magnetite nanoparticles have 650.757 m2/g surface area. The hysteresis curve showed the magnetite nanoparticles exhibit superparamagnetic properties. This simple method obtained 60 nm core-shell Fe3O4 particles with superparamagnetic, high surface area as well as hydrophylic properties. Those properties are promising for various biomedical application. The advantages of simple and short times methods with high quality of product make this method very promising to be applied. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5909 10.17146/jsmi.2017.19.1.4111 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 9-13 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5909/4343 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5911 2026-11-02T03:48:47Z jsmi:ART

SYNTHESIS AND CHARACTERIZATION OF MAGNETIC-HYDROXY APATITE COMPOSITE USINGONE SPOT COPRECIPITATION METHOD Mujamilah Ahmad Furqon Syidik Grace Tj. Sulungbudi Wildan Z. Lubis Aloma Karo Karo Composite Magnetite Maghemite Hydroxyapatite One-spot coprecipitation SYNTHESIS AND CHARACTERIZATION OF MAGNETIC-HYDROXY APATITE COMPOSITE USINGONE SPOT COPRECIPITATION METHOD. Nanocomposite of magnetic-hydroxyapatite (MHAP) has the potential to be developed as a biocompatible-biodegradable material for bone cancer diagnosis and therapy. In this study, such composite materials have been successfully synthesized by one-spot coprecipitation method and ultrasonic dispersion. The mass ratio between magnetic and hydroxyapatite fraction were varied to 30:70 (K30), 40:60 (K40) and 50:50 (K50). X-Ray Diffractometer, Transmission Electron Microscope, Fourier Transform-Infrared Spectrometer and Vibrating Sample Magnetometer were used for characterizing the properties of MHAP composite. X-Ray Diffraction pattern reveals the presence of magnetic and HAP phases, confirm the establishment of MHAP composite system. TEM image and FT-IR spectra shows the spherical morphology of magnetic nanoparticles with a size of ~ 10 nm entrapped within HAP nanorod structure without any chemical bonding between the two phase.With such physical composite mechanismand higher energy induce by ultrasonic dispersion process, magnetic fraction of even 50% mass fraction could still be loaded into HAP matrix and provide maximum magnetisation value of 34.6 emu/g. This magnetization value is higher than the result of another study of MHAP synthesis, giving better prospect for bone cancer diagnosis and therapy. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5911 10.17146/jsmi.2017.18.2.4171 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 81-86 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5911/4344 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5912 2026-11-02T03:48:47Z jsmi:ART

CONFIGURATION OF Co PHASE AND MAGNETORESISTANCE PROPERTIES IN HIGH ENERGYMILLED Co-CGRANULAR COMPOUNDS S. Purwanto E. Sukirman Co phase configuration Magnetoresistance Granular compound High EnergyMilling CONFIGURATION OF Co PHASE AND MAGNETORESISTANCE PROPERTIES IN HIGH ENERGYMILLED Co-CGRANULAR COMPOUNDS. The Co-C granular compounds which composition of Co: C was 36:34 prepared using high energy milling (HEM) process for 4.5, 12 and 20 h. The samples were characterized using X-RayDiffraction with CuKα radiation. Subsequently, the magnetic hysteresis loop of the samples was measured by a Vibrating Sample Magnetometer (VSM). Themagnetoresistance (MR)wasmeasured by standar Four Point Probe (FPP). The of XRD analyses show that a-Carbon, Co-HCP and C-FCC phases existed for the samples of 4.5 and 12 hours milling. Furthermore, the magnoresistance curves show positive trend for the samples. On the other hand, Co3O4 phase beside of C, Co-HCP, Co-FCC phases existed with negative trend for magnoresistance curve for the samples of 20 hours milling. BRIN Publishing (Penerbit BRIN) 2017-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5912 10.17146/jsmi.2017.18.2.4170 Jurnal Sains Materi Indonesia; Vol. 18 No. 2 (2017): Jurnal Sains dan Materi Indonesia; 87-91 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5912/4348 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5913 2026-11-02T03:49:24Z jsmi:ART

SIMULASI DINAMIKA MOLEKULAR REAKTIF PROSES AMORFISASI SILIKON KRISTAL Mauludi Ariesto Pamungkas Rendra Widiyatmoko Silikon amorf Amorphous silicon Silikon kristal Crystalline Silicon Dinamika molekular Molecular dynamics Silikon kristal dan silicon amorf adalah material utama yang digunakan untuk bahan solar sel. Silikon amorf lebih mudah dibuat dan lebih murah dibandingkan silikon kristal namun efisiensi silikon amorf masih lebih rendah dibanding silikon kristal. Untuk meningkatkan sifat listrik dari silikon amorf diperlukan pengetahuan strukturmikro silikon amorf yang terbentuk dari amorfisasi silikon kristal. Oleh karena itu dilakukan simulasi dinamika molekuler untuk meneliti proses amorfisasi silikon kristal. Proses amorfisasi dilakukan dengan cara yang menyerupai proses dalam eksperimen, yaitu pemanasan sampai silikon kristal mencair kemudian dilanjutkan dengan pendinginan yang cepat sehingga tidak cukup waktu untuk atom-atomnya membentuk struktur yang teratur. Setelah beberapa suhu dan kecepatan pendinginan dicoba, didapati bahwa dengan pemanasan sampai 3500 K dan dengan laju pendinginan 1014K/s silikon amorf terbentuk. Pada suhu yang terlalu tinggi, sistem menjadi rusak, sedangkan pada suhu yang terlalu rendah tidak terjadi perubahan fase. Proses amorfisasi disertai dengan meningkatnya panjang rata-rata ikatan dari ikatan 4-4 fold, 4-5 fold, dan 5-5 fold secara berurutan. Selain itu, didapati bahwa ikatan 5-fold memberikan kontribusi paling besar dalam membentuk puncak sudut 60°. BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5913 10.17146/jsmi.2017.18.3.4120 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 123-128 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5913/4346 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5914 2026-11-02T03:49:24Z jsmi:ART

STRUKTUR DAN SIFAT KEMAGNETAN NANOPARTIKEL HEKSAFERIT BaFe(12-2X)(MnNi)XO19 HASIL KOPRESIPITASI Didin Sahidin Winatapura Deswita Nanang Sudrajat BaFe(12-2x)(MnNi)xO19 Hexaferrite Heksaferit BaFe(12-2x)(MnNi)xO19 Kopresipitasi Co-precipitation method Struktur parameter Structure parameter Sifat magnet Magnetic properties Nanopartikel heksaferit BaFe(12-2x)(MnNi)xO19 (x = 0,0; 0,3; 0,7; 1,0) telah berhasil disintesis. Tujuan dari penelitian ini adalah untuk membuat heksaferit BaFe(12-2x)(MnNi)xO19 dan mengamati pengaruh konsentrasi doping ion Mn dan Ni di dalam bahan heksaferit terhadap perilaku struktur dan sifat magnet. Heksaferit BaFe(12-2x)(MnNi)xO19 dibuat dari bahan dasar Fe(NO3)3, Ba(NO3), Mn(NO3) dan Ni(NO3) dengan metoda kopresipitasi, yang kemudian diikuti perlakuan panas pada suhu 925°C selama 3 jam. Produk BaFe(12-2x)(MnNi)xO19 yang dihasilkan kemudian dikarakterisasi menggunakan peralatan difraktometer sinar-X (XRD), Scanning Electron Microscope (SEM), Vibrating Sample Magnetometer (VSM) dan Fourier Transform-Infra Red (FT-IR). Data XRD yang dihasilkan dianalisis menggunakan program General Structure Analysis System (GSAS). Hasil refinement XRD menunjukkan bahwa substitusi ion-ion Ni dan Mn kedalam Ba heksaferit dapat mengubah perilaku parameter struktur, seperti parameter kisi, volume unit sel dan kerapatan atom. Bentuk dan distribusi ukuran partikel Ba heksaferit mengalami perubahan dengan penambahan doping ion Mn dan Ni. Demikian pula, perilaku sifat kemagnetan seperti koersivitas intrinsik (Hci), magnet saturasi (Ms) dan magnet remanen (Mr) dari Ba heksaferit hasil substitusi berubah dengan penambahan substitusi ion-ion Ni dan Mn. BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5914 10.17146/jsmi.2017.18.3.4116 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 129-135 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5914/4347 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5915 2026-11-02T03:49:24Z jsmi:ART

CONTROLLED GROWTH OF IRON OXIDE MAGNETIC NANOPARTICLES VIA CO-PRECIPITATION METHOD AND NaNO3 ADDITION Grace Tj. Sulungbudi Yuliani Wildan Zakiah Lubis Sri Sugiarti Mujamilah Magnetic Nanoparticle Nanopartikel Magnetik Fe3O4 γ-Fe2O3 NaNO3 Size Ukuran CONTROLLED GROWTH OF IRON OXIDE MAGNETIC NANOPARTICLES VIA COPRECIPITATION METHOD AND NaNO3ADDITION. Size controlled magnetic nanoparticle (MNPs) of iron oxide were prepared in the presence of NaNO3 via co-precipitation method followed by HNO3 peptizing according to Massart’s method. The MNPs size were reduced by addition of NaNO3 in varied molarity and at different stage of process. As an end product, stable water-base colloids were formed. XRD pattern analysis using Rietveld method confirmed Fe3O4/γ-Fe2O3 phase formation with nanoscale crystallite size. This crystallite size significantly decrease with NaNO3 addition from 12 nm to smaller than 8 nm, and give end-result of decreasing magnetization as measured by VSM. Langevin fitting of magnetic hysteresis curve also revealed the magnetic core size of nearly the same behaviour. TEM results show bigger value for single magnetic nanoparticle of > 10 nm and < 10 nm for MNPs without and with NaNO3 addition, respectively. However, PSA measurement still trace a low nanoparticle agglomeration of ~ 20 nm, even after surface peptization using HNO3. A possible mechanism is proposed to explain these characteristics formation especially of the MNP’s size. ABSTRAK PENGENDALIAN PENUMBUHAN NANOPARTIKEL MAGNETIK OKSIDA BESI DENGAN METODA KO-PRESIPITASI DAN PENAMBAHAN NaNO3. Nanopartikel magnetik oksida besi dengan ukuran terkendali telah dipreparasi dengan metoda ko-presipitasi dan penambahan NaNO3  serta peptisasi HNO3 mengikuti metoda Massart. Pengendalian ukuran nanopartikel magnetik dilakukan dengan memvariasikan nilai molaritas serta tahapan proses penambahan NaNO3. Hasil analisis pola difraksi sinar-X dengan metoda Rietveld mengkonfirmasi terbentuknya fasa Fe3O4/γ-Fe2O3 dengan penurunan ukuran kristalit dari 12 nm untuk sampel tanpa penambahan NaNO3 menjadi 8 nm setelah penambahan NaNO3. Pengecilan ukuran ini juga teranalisis pada hasil fitting kurva magnetisasi dengan persamaan Langevin serta pengamatan dengan TEM. Namun hasil pengukuran PSA tetap mendeteksi adanya aglomerasi nanopartikel dengan ukuran aglomerat terkecil ~20 nm meski telah dilakukan upaya peptisasi dengan HNO3. Mengacu pada berbagai data karakteristik dan hasil analisis ini, mekanisme pengendalian pertumbuhan ukuran partikel ini dicoba dijelaskan dalam artikel ini. BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5915 10.17146/jsmi.2017.18.3.4122 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 136-143 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5915/4349 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5920 2026-11-02T02:59:30Z jsmi:ART

PENGARUH SUHU REAKSI PADA POLIMERISAS IHIDROGEL BERBASIS KITOSAN Lik Anah Hidrogel Kitosan Asam akrilat Polimerisasi radikal bebas Benzoyl peroxide PENGARUH SUHU REAKSI PADA POLIMERISAS IHIDROGEL BERBASIS KITOSAN. Polimer hidrogel kitosan-g-poli(asam akrilat) telah dipreparasi dalam larutan melalui polimerisasi radikal bebas (free radical polymerization) menggunakan benzoyl peroxide (BPO) sebagai inisiator dan methylene bisa crylamide (MBA) sebagai agen ikatan silang (crosslinking agent). Percobaan dilangsungkan dalam reaktor gelas leher tiga yang dilengkapi dengan kondensor, waterbath dan pengaduk mekanik di bawah kondisi inert atmosphere. Sebagai variabel tetap dalam proses kopolimerisasi cangkok (grafted copolymerization) monomer asamakrilat pada kitosan adalah ratio asam akrilat (AA) terhadap kitosan (CTS) = 7,2; konsentrasi BPO 2,44% w/w; konsentrasi MBA 2,44%w/w, agitasi 200 rpm dan waktu reaksi 3 jam. Suhu polimerisasi divariasikan pada 30, 50, 70, dan 90oC. Kemampuan penyerapan air (water absorbency) oleh kopolimer cangkok (graft copolymer) hidrogel kitosan-g-poli (asam akrilat) (CTS-g-PAA) diuji melalui analisa swelling ratio dalam air distilat dan larutan NaCl 9%. Hasil percobaan menunjukkan bahwa proses polimerisasi pada suhu 90 oC memberikan hasil kapasitas swelling (swelling capacity) tertinggi yaitu sebesar 41,68 g/g dalam air distilat dan 42,55 g/g dalam larutan NaCl 9%. Hasil analisa FT-IR menunjukkan bahwa pada hidrogel CTS-g-PAA telah terjadi enam puncak baru pada bilangan gelombang 1577, 1404, 1172, 1076, 713, dan 632 cm-1. Hasil analisa morfologi permukaan menggunakan SEM menunjukkan bahwa hidrogel CTS-g-PAA memiliki struktur yang porous dan lebih kompak daripada kitosan murni. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5920 10.17146/jsmi.2016.17.2.4204 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 62-68 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5920/4368 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5923 2026-11-02T02:59:30Z jsmi:ART

PENGARUH JENIS KARET ALAM TERHADAP SIFAT FISIKA VULKANISAT KARET UNTUK PRODUK BANTALAN JEMBATAN Asron Ferdian Falaah Adi Cifriadi Mochamad Chalid Karet alam Kompon Vulkanisasi Bantalan jembatan PENGARUH JENIS KARETALAM TERHADAPSIFAT FISIKAVULKANISAT KARET UNTUKPRODUK BANTALAN JEMBATAN. Vulkanisat karet bantalan jembatan diproduksi melalui beberapa tahapanmeliputi pemilihan bahan baku karet, perancangan formulasi kompon, pencampuran, dan vulkanisasi. Pemilihankaret alam untuk vulkanisat bantalan jembatan merupakan tahapan penting karena mempengaruhi sifat produkakhir. Penelitian bertujuan menganalisis pengaruh penggunaan beberapa jenis karet alam seperti sit asap, karetkompo, karet sit rakyat dan karet standar Indonesia terhadap sifat fisika vulkanisat karet untuk produkbantalan jembatan. Penelitian ini melakukan uji sifat teknis bahan baku karet yang digunakan meliputi ujiplastisitas awal (P0); indek ketahanan plastis (PRI); kadar abu; kadar zat menguap; kadar kotoran dan melakukanperancangan kompon karet dan pengujian sifat fisika vulkanisat berupa uji kekerasan; kuat tarik; perpanjanganputus; pengusangan; pampatan tetap; ketahanan ozon yang mengacu pada SNI3967:2013 untuk bantalanjembatan. Hasil penelitian menunjukkan karet sit asap mempunyai sifat teknis yang lebih baik dibandingkandengan jenis karet mentah lain berdasarkan nilai PRI, kadar abu dan kadar kotoran. Hasil uji sifat fisika untukparameter kekerasan, kuat tarik, dan perpanjangan putus tidak berbeda nyata, namun setelah pengusanganmenunjukkan perbedaan nyata pada nilai kuat tarik dan perpanjangan putus. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5923 10.17146/jsmi.2016.17.2.4205 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 69-76 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5923/4353 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5926 2026-11-02T02:59:30Z jsmi:ART

PENGARUH KONSENTRASI POLIETILEN GLIKOL(PEG) TERHADAP KARAKTERISTIK NANO FLUIDA AIR-ALUMINA Pipih Nurhidayati Pipih Nurhidayati Dani Gustaman Sya Nanofluida Alumina (Al2O3) CHF PEG Konduktivitas termal PENGARUH KONSENTRASI POLIETILEN GLIKOL(PEG) TERHADAP KARAKTERISTIK NANO FLUIDA AIR-ALUMINA. Telah dilakukan penelitian pengaruh Polietilen Glikol (PEG) terhadap transfer panas pada nanofluida air alumina (Air-Al2O3). Sintesis nanofluida dilakukan dengan mendispersikan nanopartikel alumina (Al2O3) ke dalam fluida konvensional air (H2O). Pada penelitian ini dikaji pengaruh penambahan PEG terhadap karakteristik nanofluida air-Al2O3. Karakterisasi nanofluida yang dilakukan adalah pengukuran zeta potensial, viskositas, konduktivitas termal, dan Critical Heat Flux (CHF). Serbuk Al2O3 untuk nanofluida dianalisis menggunakan Scanning ElectronMicroscope (SEM) dan X-RayDffactometer (XRD), luas permukaannya diukur dengan alat surface areameter dengan menggunakan metode Brunauer-Emmett-Teller (BET). Penambahan Al2O3 sebesar 1 gram dapat meningkatkan konduktivitas termal sebesar 6% dan peningkaktan CHF sebesar 149% dibandingkan dengan konduktivitas termal dan CHF air. Nilai optimum konsentrasi PEG adalah 0,3%. Penambahan PEG 0,3% dapat meningkatkan konduktivitas termal sebesar 7,6% dan CHF sebesar 232% di bandingkan dengan konduktivitas termal and CHF air. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5926 10.17146/jsmi.2016.17.2.4206 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 77-81 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5926/4356 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5928 2026-11-02T03:55:11Z jsmi:ART

ROLES OF PREPARATION METHOD ON CHARACTERISTICS OF SUPRAMOLECULAR-STRUCTURED POLYMER ELECTROLYTE MEMBRANE FUEL CELL BASED ON SULFONATED POLYSTYRENE Sunit Hendrana Morina Septiviani Semboor Christi Liamita Natanae Iman Rahayu Mashadi Sudirman PEMFC Sulfonated Polystyrene Polistirena Tersulfonasi PE-g-MA Supramolecular Structure Struktur Supramolekular ROLES OF PREPARATION METHOD ON CHARACTERISTICS OF SUPRAMOLECULARSTRUCTURED POLYMER ELECTROLYTE MEMBRANE FUEL CELL BASED ON SULFONATED POLYSTYRENE. Polymer Electrolyte Membrane Fuel Cell with supramolecular structure based on Sulfonated Polystyrene (S-PS) have been developed in Research Centre for Physics LIPI. In forming the supramolecular structure sulfonate groups in S-PS are aligned with polyethylene-graft-maleic anhydride (PE-g-MA) which carried out by dissolution of the constituent and mixing of both. The alignment of sulfonate groups in s-PS is carried out in a liquid form. Therefore, in this study, the effect of concentration of the solution of both polymers constituent to the alignment of the sulfonate groups and the characteristics of the membrane produced is studied. Scanning Electron Microscope (SEM) images show that all membranes prepared are rigid. Differential Scanning Calorimetry (DSC) studied show very significance differences in its crystal sizes. XRD diffraction data also support the previous results. Membrane prepared from very dilute solution having better ion exchange capacity (IEC), water uptake and ionic conductivity. Therefore, the experiments results showing that very low concentration of polymer constituent, clearly, produced better interaction of both, which agree with hyphotesis in this work where supramolecular structure can be formed by mixing two very dilute polymer solutions. ABSTRAK PERAN METODE PREPARASI PADA KARAKTETISTIK DARI POLIMER ELEKTROLIT MEMBRAN FUEL CELL DENGAN STRUKTUR SUPRAMOLEKULAR BERBASIS POLISTIREN TERSULFONASI. Polimer Elektrolit Membran Fuel Cell dengan struktur supramolekular berbasis polistirena tersulfonasi (S-PS) telah dikembangkan di Pusat Penelitian Fisika LIPI. Pada pembentukan struktur supramolekular gugus sulfonat pada polistirena tersulfonasi diarahkan dengan polietilen-graft-anhidrida maleat (PE-g-MA) yang dilakukan dengan melarutkan kedua bahan penyusun tersebut. Pengarahan gugus sulfonat dari S-PS dilakukan dalam kondisi cair. Karenanya, dalam studi ini, efek dari konsentrasi dari kedua larutan polimer penyusun pada pengarahan gugus karbonat dimaksud dan karakteristik-karakteristik dari membran yang dihasilkan akan dipelajari. Image SEM menunjukkan bahwa semua membran yang dibuat adalah rigid. Studi DSC menunjukkan terdapat perbedaan yang sangat berarti pada ukuran kristal. Data XRD juga mendukung hasil-hasil yang diperoleh. Membran yang dibuat dengan larutan yang sangat encer memiliki kapasitas petukaran ion (EIC), tangkapan-air dan konduktifitas ionik yang lebih baik. Oleh karenanya, data eksperimen menunjukkan bahwa dengan larutan yang sangat encer dari polimer penyusunnya, secara nyata, menghasilkan interaksi diantara polimer penyusun yang lebih baik, yang mana hal ini sesuai dengan hipotesis penyusunan struktur supramolekular melalui pencampuran dua polimer dengan konsenstrasi sangat encer. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5928 10.17146/jsmi.2017.18.4.4130 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 147-154 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5928/4369 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5929 2026-11-02T03:59:51Z jsmi:ART

STRUKTURMIKRO DAN SIFAT MAGNET PASIR BESI PASCA ULTRASONIFIKASI S. Purwanto M. Dani Pasir besi strukturmikro sifat magnetik ultrasonifikasi Struktur nano dan komposisinya yang berkaitan dengan sifat magnetik telah dipelajari dengan High Resolution Transmission Electron Microscope (HRTEM), Scanning Electron Microscopy Energy Dispersive Spectroscopy (SEM-EDS) dan Vibrating Sample Magnetometer (VSM) pada serbuk pasir besi sebelum dan sesudah ultrasonifikasi. Telah diketahui adanya dua fasa utama Fe3O4 dan FeTiO3 dengan fasa minor Al2O3, MgO dan SiO2 pada sampel tanpa perlakuan berdasarkan pengamatan dengan SEM-EDS. Sedangkan hasil pengamatan dengan HRTEM dapat dikonfirmasi adanya nanograin Fe3O4 dan FeTiO3 dengan diameter sekitar 10 nm pada serbuk pra-ultrasonik. Peningkatan nilai saturasi magnetik Ms = 32,3 emu /gram, 34,5 emu/gram dan 46,4 emu/gr masing-masing untuk cuplikan pra-ultrasonik dan ulrasonifikasi selama 10 menit dan 30 menit, sedangkan medan koersif magnet (Hc) dari 100,5 Oe menjadi 112,5 Oe. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5929 10.17146/jsmi.2017.19.1.4129 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 14-18 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5929/4358 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5931 2026-11-02T04:29:41Z jsmi:ART

KOPOLIMERISASI CANGKOK POLI(KALIUMAKRILAT)- GELATIN HASIL IRADIASI GAMMA Erizal Dian Pribadi P. Evi Yulianti Sudirman Hariyanti Fajar Lukitowati Hidrogel Superabsorben Cangkok Iradiasi Gelatin KOPOLIMERISASI CANGKOK POLI(KALIUMAKRILAT)-GELATIN HASIL IRADIASI GAMMA. Hidrogel Super Absorben (HSA) merupakan polimer yang dapat menyerap air dalam jumlah yang relatif besar (± 1000 kali berat kering) dan salah satu baku penting khususnya untuk popok bayi/dewasa. Satu seri HSA dibuat dari asam akrilat yang telah dinetralkan sebagian dengan KOH, lalu dicangkokan (grafting) dengan gelatin pada konsentrasi 1% hingga 4 %(b/v,%) dan diiradiasi menggunakan sinar gamma pada dosis tunggal 10 kGy (laju dosis 2,5 kGy/jam). Terjadi cangkok gelatin pada polimer diukur menggunakan Fourier Transform Infra Red (FT-IR) dan morfologi diobservasi menggunakan Scanning Electron Microscope (SEM). Fraksi gel dan kemampuan hidrogel dalam mempertahankan air yang diserap (rasio swelling) dan Equilibrium Degree of Swelling (EDS) hidrogel ditentukan dengan metode gravimetri. Hasil evaluasi menggunakan SEM, morfologi permukaan HSA hasil iradiasi menunjukkan terjadi cangkok polimer (kalium akrilat) pada molekul gelatin dan hasil pengukuran spektrum FT-IR menunjukkan gugus karboksilat (COOH) yang bereaksi dengan gelatin. Meningkatnya konsentrasi gelatin hingga 4 %, rasio swelling, fraksi dan EDS hidrogel juga mengalami peningkatan. Hidrogel HSA poli (kalium akrilat-g-gelatin dapat dipertimbangkan sebagai bahan material kandidat biodegradable hidrogel untuk aplikasi di biang kesehatan/farmasi. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5931 10.17146/jsmi.2018.19.4.4963 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 139-146 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5931/4355 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5932 2026-11-02T04:41:51Z jsmi:ART

THERMAL DECOMPOSITION KINETICS OF LANTHANUM OXALATE HYDRATE PRODUCT TREATMENT FROM MONAZITE M.V. Purwani Suyanti Wisnu Ari Adi kinetics thermal decomposition lanthanum oxalate hydrate THERMAL DECOMPOSITION KINETICS OF LANTHANUM OXALATE HYDRATE PRODUCT TREATMENT FROM MONAZITE. Unreacted shrinking core model variation was developed for calcination and solid thermal decomposition reaction to non catalytic gas and no gas reactants were involved. In this research, thermal decomposition of lanthanum oxalate hydrate product treatment of monazite. The parameters for modeling are the time and temperature of thermal decomposition. The time was between 0 - 150 minutes with 30 minute intervals and the temperature range between 600 – 700 oC with 100 oC intervals. Based on the experimental data it can be concluded that the most suitable model was unreacted core sphere ash diffusion controls and obtained the relation between temperature T oC with diffusion coefficient D following equation D = 0.0011 T + 0.5175 with linearity R² = 0.9561. Another possible model was the sphere reaction control and obtained the relationship between 1 / T (K) and reaction rate constant ks was ks = 48873.e -4.88 / RT with activation energy = 4.88 kJ. The relationship between time t with rc (radius of particles at time t) at various temperatures and the relation between temperature and rc at various times follows the exponential line equation. If temperature and time parameters were combined will find the relation between time and temperature with rc following the equation ln rc = -0.9536 (9E-04 T + 0.005 T) + 4.9976. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5932 10.17146/jsmi.2019.20.2.5295 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 50-57 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5932/4359 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5933 2026-11-02T04:29:41Z jsmi:ART

MODIFIKASI SELULOSA MENGGUNAKAN ASAM AKRILAT DAN TRIMETHALLYL ISOCIANURATE DENGAN METODE PRA IRADIASI PEROKSIDA Meri Suhartini Asep Saefumillah Ikfa Nur Fadilla Selulosa Kopolimerisasi cangkok Peroksida Asam akrilat Trimethallyl Isocianurate MODIFIKASI SELULOSA MENGGUNAKAN ASAM AKRILAT DAN TRIMETHALLYL ISOCIANURATE DENGAN METODE PRA IRADIASI PEROKSIDA. Modifikasi selulosa dengan asam akrilat menggunakan pengikat silang Trimethallyl Isocianurate (TMAIC) dengan teknik kopolimerisasi cangkok pra-iradiasi-peroksida telah berhasil dilakukan. Penelitian ini bertujuan untuk mendapatkan adsorben ion logam berbasis selulosa. Pengikat silang TMAIC digunakan untuk meningkatkan ketahanan asam dan termal dari selulosa-g-AA. Kondisi optimum reaksi pencangkokan diperoleh pada dosis radiasi 40 kGy, konsentrasi TMAIC 0,5 %(w/v), konsentrasi monomer 10 %(v/v), suhu pencangkokan 90 °C dan waktu pencangkokan 6 jam, dengan persen pencangkokan rata-rata sebesar 42,37 %. Pengembangan dalam air turun sebesar 36 % setelah penambahan TMAIC. Hasil sintesis kopolimer selulosa-TMAIC-g-AA telah berhasil dikarakterisasi dengan FT-IR, TGA dan SEM. Selulosa terikat silang dapat digunakan sebagai adsorben ion logam Pb2+, dengan kapasitas adsorpsi sebesar 2,60 mg/g pada waktu kontak 2 jam dan pH 5 (konsentrasi awal Pb2+ 10 mg/L). Isoterm adsorpsi yang sesuai dengan adsorpsi Pb(II) dengan kopolimer adalah isoterm adsorpsi Langmuir yang berarti energi adsorpsi konstan di semua sisi kopolimer tersebut. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5933 10.17146/jsmi.2018.19.4.4964 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 147-156 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5933/4357 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5934 2026-11-02T02:59:30Z jsmi:ART

SINTESIS SILIKA METODE SOL-GEL SEBAGAI PENYANGGA FOTOKATALIS TiO2 TERHADAP PENURUNAN KADAR KROMIUM DAN BESI Diana Rakhmawaty Eddy Atiek Rostika Noviyanti Dini Janati Silika sol-gel Fotokatalis TiO2-SiO2 Logam SINTESIS SILIKA METODE SOL-GEL SEBAGAI PENYANGGA FOTOKATALIS TiO2 TERHADAP PENURUNAN KADAR KROMIUM DAN BESI. Silika merupakan material yang menarik perhatian para peneliti karena aplikasinya yang luas dan pembuatannya yang mudah. Salah satu metode pembuatan silika adalah metode sol-gel. Silika yang dihasilkan bersifat amorf dengan densitas yang rendah sehingga dapat digunakan sebagai penyangga fotokatalis. Penelitian ini bertujuan untuk membuat fotokatalis TiO2 -SiO2 untuk menurunkan kadar logam kromium dan besi dalam air. Tahapan penelitian adalah sintesis silika dengan variasi konsentrasi amonia dan suhu kalsinasi, imobilisasi TiO2 pada SiO2 , dan uji fotokatalisis TiO2 -SiO2 terhadap kadar logam kromium dan besi dari air Sungai Cikijing. Untuk mengetahui gugus fungsi, morfologi, bentuk kristal, komposisi TiO2 dalam fotokatalis TiO2 -SiO2 , dan kadar logam dilakukan analisis dengan menggunakan Fourier Transform - Infra Red (FT-IR), Scanning Electron Microscope (SEM-EDX), X-Ray Diffractometry (XRD), dan Atomic Absorbtion Spectroscopy (AAS).Dalam penelitian ini, jumlah konsentrasi amonia dan suhu kalsinasi divariasikan yaitu; 12,5% dan 25% dengan suhu kalsinasi 400C, 500C, dan 600C. Hasil analisis FT-IR menunjukkan bahwa puncak silika muncul pada bilangan gelombang 3447 cm-1 (regang –OH), 1638 cm-1 (regang Si-O) dan 1107 cm-1 (regang Si-O-Si). Hasil pengukuran TiO2 -SiO2 10% dengan XRD menunjukkan bahwa puncak pada 2θ = 25,26° adalah TiO2 anatase dan 2θ = 23,86° adalah SiO2 amorf sehingga diketahui bahwa TiO2 terimobilisasi pada SiO2 dengan komposisi TiO2 sebesar 10,05% dari hasil pengukuran SEM-EDX. Uji fotokatalisis TiO2 -SiO2 10% memiliki aktivitas optimum dalam menurunkan kadar logam kromium sebesar 95,30% dan besi sebesar 93,62% pada konsentasi awal kromium 3,832 mg/L dan besi 2,039 mg/L. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5934 10.17146/jsmi.2016.17.2.4207 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 82-89 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5934/4360 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5935 2026-11-02T04:29:41Z jsmi:ART

THE INFLUENCE OF ALOE VERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUN ALOE VERA-PVA NANOFIBER Harini Sosiati Alif Nur Widodo Aris Widyo Nugroho Aloe vera PVA Electrospinning Nanofiber Tensile properties THE INFLUENCE OF ALOE VERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUNALOE VERA-PVA NANOFIBER. Aloe Vera (AV)-poly (vinyl alcohol) (PVA) electrospinning solution with 0%, 2%, 4% and 6% AV concentrations were electrospun to explore the influence of AV concentration on the morphology and tensile properties of the nanofibers membranes. The results showed that the change in the morphology and tensile properties of electrospun AV-PVA nanofibers depends upon AV concentration of electrospinning solution. Mean fiber diameter at 2% (342  0.8 nm) and 4% (337  0.6 nm) AV concentrations is smaller than that at 0% (377  1.1 nm) and 6% (810  3.4 nm) AV concentrations with relatively uniform size distribution. Tensile strength and modulus at AV concentration of 2% (5.74 MPa and 33.99 MPa) and 4% (6.38 MPa and 34.75 MPa) are higher than that at 0% (4.98 MPa and 26.45 MPa) and 6% (2.22 MPa and 13.69 MPa), respectively. AV-PVA electrospinning solution with AV concentration ranging from 2% to 4% is considered being the optimum range that could produce the electrospun nanofibers with the tensile properties included in the range of that specified by the native skin. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5935 10.17146/jsmi.2018.19.4.4965 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 157-162 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5935/4361 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5936 2026-11-02T03:59:51Z jsmi:ART

SINTESIS BAHAN ABSORBER GELOMBANG MIKRO Ni(1,5-x)LaxFe1,5O4 DENGAN METODE SOL-GEL Yunasfi Mashadi Ade Mulyawan Nikel lantanum ferit Metode sol-gel Sifat magnet Serapan gelombang mikro Telah dilakukan sintesis bahan absorber gelombang mikro Ni(1,5-x)LaxFe1,5O4 dengan (x = 0,0; 0,5 dan 1,0) menggunakan metode sol-gel. Bahan Ni(1,5-x)LaxFe1,5O4 disintesis dari campuran serbuk Ni(NO3)2, Fe(NO3)3 dan La(NO3)3 dalam perbandingan mol masing-masing serbuk dengan menggunakan metode sol-gel dan kemudian disinter pada suhu 1200 C selama 3 jam. Identifikasi fasa dengan X-Ray Diffractometer (XRD) menunjukkan bahwa dengan penambahan kandungan ion La3+ terbentuk Ni(1,5-x)LaxFe1,5O4 dengan 2 fasa yaitu NiFe2O4 dan LaFeO3. Pengamatan morfologi dengan Scanning Electron Microscope (SEM)menunjukkan terbentuknya partikel yang tidak homogen yang artinya bahwa reaksi pembentukan Ni(1,5-x)LaxFe1,5O4 belum sempurna. Sifat magnet sampel yang dianalisis dengan Vibrating Sample Magnetometer (VSM) menunjukkan bahwa sampel berperilaku feromagnetik, dimana nilai Ms semakin rendah (pada rentang 32,76 emu/g hingga 9,40 emu/g) dan nilai Hc semakin besar (pada rentang 200-247 Oe) seiring dengan penambahan kandungan La. Sedangkan kemampuan penyerapan gelombang mikro yang diukur dengan Vector Network Analyzer (VNA) menunjukkan nilai Reflection Loss (RL) maksimum diperoleh pada komposisi sampel x = 0,5 sebesar -27,5 dB pada frekuensi 10,60 GHz. Berarti bahwa NiLa0,5Fe1,5O4 mampu menyerap gelombang mikro sebesar ~96 % pada frekuensi 10,60 GHz. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5936 10.17146/jsmi.2017.19.1.4131 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 19-24 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5936/4364 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5937 2026-11-02T04:41:51Z jsmi:ART

UTILISATION OF SLAG POWDER FOR CEMENT SUBSTITUTION BASED ON THE COMPRESSIVE STRENGTH AND PENETRATION OF CHLORIDE IONS Yasmina Amalia Syoni Soepriyanto Nickel Pig Iron (NPI) slag Calcium Silicate Hydrate (CSH) Calcium Hydroxide (CH) UTILIZATION OF SLAG POWDER FOR CEMENT SUBSTITUTION BASED ON THE COMPRESSIVE STRENGTH AND PENETRATION OF CHLORIDE IONS. The availability of waste from nickel ore smelting in the form of slag has increased, this is due to the high nickel production to meet the increasing needs for development and for compound- ing materials for construction materials. This research aims to make a paste from the mixture of Nickel Pig Iron (NPI) slag from PT Indoferro which is used as a substitute for making cement paste. The materials used in this study are cement, nickel slag, water, and zeolite. The cement paste is made with a dimension of 10 cm x 5 cm with each slag used as an amplifier on the paste with a volume variation of 15%, 30%, 45%, and 60%. Each material is weighed according to mix design then mixing the materials, after they are homogeneous, they are put into the mold and then let stand for 24 hours until the paste solidifies and hardens, after 24 hours, the paste sample is removed from the mold and treated at room temperature, after the life is qualified, the paste sample is tested. Results of the compression test show that variations of slag addition to the paste mixture giving maximum compressive strength is the 15% variant for NPI slag. The increase in compressive strength of the slag mixture paste may occur because slag contains cement compounds which can chemically react with Calcium Hydroxide (CH) com- pounds as a result of the hydration reaction of cement with water to form a Calcium Silicate Hydrate (CSH) compound from the hydration result between water and cement to increase adhesion and compressive strength on cement paste. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5937 10.17146/jsmi.2019.20.2.5446 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 58-61 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5937/4362 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5939 2026-11-02T04:29:41Z jsmi:ART

MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES Aris Widyo Nugroho Imam Nur Sholeh Harini Sosiati Electrospinning Nanofibers Snail mucin PVA Wound dressing MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES. Snail mucin has been widely known to contain agents with wound healing properties. A preliminary research with regard to the potential to manufacture composite nanofibrous membranes of polyvinyl alcohol (PVA) and snail mucin (SM) by the electrospinning technique for wound dressing applications has been conducted. The effect of SM concentration on the morphology and tensile properties of PVA/SM nano membrane has been investigated. The PVA/SM solutions with various concentration of SM (0%, 2%, 4%, dan 6%)(w/v) were electrospun at the optimized process parameters. The morphology nanofiber membranes was observed by scanning electron microscopy and the average diameters of prepared nanofibers was determined by image analysis technique. The tensile test was conducted to examine the tensile properties of the nanofiber membranes being prepared according to ASTM D882. The PVA/SM nanofibre membrane possessing the tensile strength and tensile strain ranging between 3.48-5.37 MPa and 101.25- 157.13 %, respectively were successfully fabricated. The membrane of 10% (w/v) PVA/ 2% (w/v) SM achieved the highest values of tensile strength. This phenomenon has been associated to the uniformity of fiber size diameter distribution within the membranes. It was expected that further optimization of the processing would allow development of the tensile properties compatibility requirement with this being the subject of future work by the authors. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5939 10.17146/jsmi.2018.19.4.4966 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 163-168 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5939/4363 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5940 2026-11-02T02:59:30Z jsmi:ART

PENGARUH IMPLANTASI ION ARGON PADA STRUKTUR MIKRO DAN KEKERASAN BAJA AISI 430 UNTUK BAHAN STRUKTUR REAKTOR Agus Hadi Ismoyo B. Bandriyana B. Bandriyana Parikin Implantasi ion Ar Struktur mikro Kekerasan PENGARUH IMPLANTASI ION ARGON PADA STRUKTUR MIKRO DAN KEKERASAN BAJA AISI 430 UNTUK BAHAN STRUKTUR REAKTOR. Rekayasa permukaan dengan teknik implantasi ion argon (Ar+) dapat meningkatkan sifat bahan terutama kekerasannya. Implantasi ion argon ini dilakukan pada baja komersial AISI 430 untuk aplikasi bahan komponen reaktor. Perubahan struktur mikro dan kekerasan setelah implantasi diteliti untuk analisis perubahan sifat mekanik bahan. Proses implantasi ion dilakukan pada energi percepatan sebesar 100 keV dengan arus ion 10mA dan waktu implantasi divariasi 30, 60 dan 90menit. Pengamatan struktur mikro dan fasa dilakukan dengan pengujian mikroskop optik dan uji XRD (X-ray diffraction), sedang pengujian kekerasan dilakukan dengan metode pengukuran Vickers. Hasil uji mikroskop optik menunjukkan terjadi proses difusi ion argon ke permukaan baja komersial AISI 430 dengan kedalaman difusi sekitar 0, 5 mikron untuk waktu implantasi 60 menit dan 2 mikron untuk 90 menit implantasi. Hasil uji XRD untuk sampel sebelum dan sesudah implantasi menunjukkan identifikasi refleksi puncak bidang (110), (200) dan (211) berturutan muncul pada sudut difraksi 2θ= 44,57°; 64,86° dan 82,11°. Implantasi ion tidak menumbuhkan puncak dan fasa baru yang menunjukkan hanya terjadi proses substitusi dan bukan interstisi argon terhadap atombesi atau atom krompada kisi kristal BCC. Hal ini disebabkan karena jari-jari atomargon 0,987 Å hampir sama dengan jari-jari kovalen besi yaitu 1,17 Å seperti ini ditunjukkan pada pergeseran sudut difraksi. Perubahan kekerasan terjadi pada proses implantasi sesuai dengan dosis ionArgonmelalui penambahan waktu implantasi.Nilai kekerasan bajameningkat setelah diimplantasi ion argon, semakin lama proses implantasi semakin tinggi kekerasannya.Mula-mula saat baja komersialAISI 430 diimplantasi dengan ion argon selama 30 menit kekerasannya adalah 190,78 HV, kemudian setelah baja komersial AISI 430 diimplantasi dengan ion argon selama 60 menit kekerasannya menjadi 222,53 HV dan setelah baja komersial AISI 430 diimplantasi dengan ion argon selama 90 menit kekerasannya menjadi 241,46 HV. BRIN Publishing (Penerbit BRIN) 2016-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5940 10.17146/jsmi.2016.17.2.4208 Jurnal Sains Materi Indonesia; Vol. 17 No. 2 (2016): Jurnal Sains dan Materi Indonesia; 90-94 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5940/4365 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5941 2026-11-02T04:41:51Z jsmi:ART

UTILIZATION OF INDONESIAN LOCAL STANNIC CHLORIDE (SnCl4) PRECURSOR IN THE PROCESS OF MAKING FLUORINE- DOPED TIN OXIDE (FTO) CONDUCTIVE GLASS Tri Arini Latifa Hanum Lalasari Lia Andriyah Gennady Fahmi F. Firdiyono FTO conductive glass Indonesian local precursor ultrasonic spray pyrolysis nebulizer deposition temperature tetragonal UTILIZATION OF INDONESIAN LOCAL STANNIC CHLORIDE (SnCl4) PRECURSOR IN THE PROCESS OF MAKING FLUORINE-DOPED TIN OXIDE (FTO) CONDUCTIVE GLASS. Thin layer of fluorine- doped tin oxide (FTO) conductive glass has been deposited on a glass substrate heated at a temperature of 350°C using the ultrasonic spray pyrolysis nebulizer method with variations in fluorine doping and substrate temperatures. This experiment uses the raw material of Indonesian local stannic chloride (SnCl4) (PT Timah Industri) as a precursor with a temperature variation of 250, 300, 350, 400°C. The structure and morphology of the optical and electrical properties of all the thin layers have been examined. XRD results show that all thin layers have a tetragonal crystal structure. In this experiment, there is a significant influence on the role of fluorine doping on resistivity and transmittance values. With the addition of 2% wt doping, the resistivity and transmittance values decrease. The optimum value is obtained by doping 2 wt%, substrate temperature of 350°C with a resistivity value of 9.28.10-5 Ω.cm and transmittance value of 88%. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5941 10.17146/jsmi.2019.20.2.5469 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 62-66 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5941/4372 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5942 2026-11-02T04:29:41Z jsmi:ART

KARAKTERISASI SIFAT MAGNETIK DAN SERAPAN GELOMBANG MIKRO Ni(0,5-X)LaX Fe2,5O4 HASIL SINTESIS DENGAN METODE KO-PRESIPITASI Yunasfi Nurdini Awaliyah Hendrawati Ni(0,5-X)LaXFe2,5O4 Metode ko-presipitasi Sifat magnetik Serapan gelombang mikro KARAKTERISASI SIFAT MAGNETIK DAN SERAPAN GELOMBANG MIKRO Ni(0,5-x)Lax Fe2,5O4 HASIL SINTESIS DENGAN METODE KO-PRESIPITASI. Telah dilakukan sintesis bahan penyerap gelombang mikro Ni(0,5-x)La x Fe2,5O4 dengan metode ko-presipitasi. Serbuk Ni(0,5-x)La x Fe2,5O4 (dengan x = 0; 0,2; dan 0,4) disintesis dengan mencampurkan serbuk NiCl2 , LaCl3 dan FeCl3 sesuai dengan perbandingan molnya dengan larutan pengendap NH4OH 4 M. Serbuk Ni(0,5-x)La x Fe2,5O4 yang terbentuk disinter pada suhu 1000 oC selama 5 jam. Hasil identifikasi fasa dengan X-Ray Diffractometer (XRD) menunjukan bahwa pada serbuk Ni0,5Fe2,5O4 (x = 0,0) terbentuk fasa NiFe2O4 dan Fe2O3 . Substitusi ion La3+menyebabkan munculnya fasa baru yang ditandai dengan munculnya fasa NiFe2O4 , Fe2O3 dan FeLaO3.FasaNiFe2O4 berkurang, sedangkan fasa Fe2O3 dan FeLaO3 semakin meningkat seiring dengan bertambahnya kandungan ion La3+. Karakterisasi sifat magnet serbuk Ni(0,5-x)La x Fe2,5O4 dengan Vibrating Sample Magnetometer (VSM) menunjukkan perilaku feromagnetik, nilai Ms semakin rendah dari 31 emu/g hingga 21 emu/g sedangkan nilai Hc semakin meningkat dari 123 Oe sampai 149 Oe seiring dengan peningkatan kandungan ion La3+. Peningkatan kadungan ion La3+ juga berhubungan dengan kemampuan penyerapan gelombang mikro. yang diukur dengan Vector Network Analyzer (VNA). Diketahui bahwa serapan gelombang mikro semakin meningkat seiring dengan peningkatan kandungan ion La3+, yaitu pada kisaran ~80 % sampai ~94 %. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5942 10.17146/jsmi.2018.19.4.4962 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 169-173 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5942/4366 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5943 2026-11-02T03:59:51Z jsmi:ART

PENENTUAN KANDUNGAN ASBES PADA MATERIAL GASKET MENGGUNAKAN TEKNIK PETROGRAFI SAYATAN TIPIS DAN DIFRAKSI SINAR-X Firmansyah Sasmita Aditianto Ramelan Nurcahyo Indro Basuki Asbes Asbestos-containing material Gasket Petrografi Sayatan Tipis Difraksi Sinar-X Gasket digunakan sebagai penyumbat statis antara dua komponen stasioner, dalam hal ini flens, dari asembli mekanik yang di dalamnya berisi fluida tertentu. Sebelum regulasi tentang pemakaian asbes diperketat, material gasket umumnya mengandung asbes karena keunikan sifatnya, yaitu tahan panas atau api, insulasi listrik, dan relatif terjangkau biayanya. Regulasi dari Occupational Safety and Health Administration (OSHA) 29 CFR 1910.1001 menjelaskan bahwa Asbestos Containing Material (ACM) ialah material apapun yang mengandung asbes lebih dari satu persen. Penentuan kandungan asbes pada material penyusun gasket perlu dilakukan mengingat produk-produk tersebut diperiode lampau diduga mengandung asbes lebih dari ambang batas yang dipersyaratkan. Teknik karakterisasi untuk mendeteksi keberadaan asbes tidak banyak dan relatif rumit begitu juga dengan aspek praktisnya. Teknik Petrografi Sayatan Tipis (PST) dan Difraksi Sinar-X (XRD) dipilih karena relatif mudah dan praktis meskipun masih terdapat kekurangan di dalamnya. Sebanyak tiga sampel gasket dan satu sampel sebagai pembanding telah dianalisis dengan menggunakan teknik karakterisasi PST dan XRD. Hasil analisis menunjukkan bahwa satu dari tiga sampel positif mengandung asbes lebih dari 1% berat bertipe mineral serpentin, yaitu ortokrisotil, berdasarkan karakteristik morfologi hasil pengamatan PST dan pola puncak XRD. Hasil karakteristik dari analisis tersebut mirip dengan sampel pembanding yang mengandung asbes dengan tipe mineral serpentin, yaitu klinokrisotil. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5943 10.17146/jsmi.2017.19.1.4126 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 25-31 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5943/4370 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5944 2026-11-02T04:29:41Z jsmi:ART

SINTESIS DAN KARAKTERISASI Au-SiO2 MENGGUNAKAN SILICA GEL DENGAN VARIASI pH Intan Paramudita Doty Dewi Risanti Ema Silika gel Nanopartikel pH SINTESIS DAN KARAKTERISASI AuSiO2 MENGGUNAKAN SILIKA GEL DENGAN VARIASI pH. Au dan SiO2 banyak digunakan sebagaimaterial tambahan untuk fotoanoda TiO2 karena dapat meningkatkan performansi DSSC. Au dapat meningkatkan pemanenan cahaya sedangkan silika bertindak sebagai material penghambur dan penghambat rekombinasi. Penelitian yang dilakukan adalah sintesis dan karakterisasi Au-SiO2 menggunakan silika gel dengan variasi pH. Silika gel dipilih karena mudah didapat, banyak tersedia dan harga yang murah. Au disintesis berdasarkan metode Turkevich. Larutan silika gel didapatkan dengan cara menggerus silika gel hingga diameter 44 μm (325 mesh), kemudia ditambahkan ke dalam campuran etanol, ammonia dan aquadest. Karakterisasi XRD menunjukkan puncak yang mengindikasi adanya SiO2 dan Au pada semua variasi pH. Ukuran nanopartikel emas yang disintesis pada pH 7 paling kecil dengan jumlah fraksi paling banyak. Sedangkan nanopartikel emas yang disintesis pada pH 2 berukuran paling besar dengan jumlah fraksi paling sedikit. Hal ini menunjukkan bahwa semakin rendah pH, maka semakin cepat proses pengintian dan pertumbuhan nanopartikel, dan sebaliknya. Celah energi Au-SiO2 menggunakan silika gel dengan variasi pH sekitar 2,5 eV hingga 3,2 eV. Berdasarkan hasil pengukuran J-V, Au-silika gel yang disintesis pada pH 7 memiliki peningkatan efisiensi tertinggi. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5944 10.17146/jsmi.2018.19.4.4967 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 174-178 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5944/4373 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5947 2026-11-02T03:59:51Z jsmi:ART

SINTESIS DAN KARAKTERISASI BIODEGRADABLE HIDROGEL SUPERABSORBEN POLI(KALIUM AKRILAT)-G-GLUKOMANAN DENGAN TEKNIK IRADIASI GAMMA Erizal Dian P. Perkasa Sulistioso GS Sudirman Juniarti Hariyanti Superabsorben Asam akrilat Glukomanan iradiasi rasio swelling Telah dilakukan sintesis satu seri hidrogel superabsorben dari campuran asam akrilat yang dinetralkan sebagian (Dn = 0,5) dengan KOH pada beragam konsentrasi glukomanan (0,25 % hingga 1 %) selanjutnya diiradiasi pada dosis 10 kGy (laju dosis 2,5 kGy/jam) pada suhu kamar. Pengaruh konsentrasi glukomanan terhadap kemampuan menyerap air dan fraksi gel hidrogel dipelajari. Perubahan struktur kimia hidrogel diukur menggunakan Fourier Transform Infra Red (FT-IR) dan morfologi permukaan hidrogel diinvestigasi menggunakan Scanning Electron Microscope (SEM). Hasil evaluasi menunjukkan bahwa pada kondisi optimum (0,5 % glukomanan), rasio swelling hidrogel mencapai nilai 800 g/g dan fraksi gel 94,45 %. Hasil analisis FT-IR mengkonfirmasi terjadinya pergeseran gugus fungsi rangkap dari C=C asam akrilat, pengujian SEM menunjukkan permukaaan hidrogel berpori pori besar yang tidak teratur. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5947 10.17146/jsmi.2017.19.1.4110 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 32-38 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5947/4388 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5948 2026-11-02T04:41:51Z jsmi:ART

SYNTHESIS AND CHARACTERIZATION OF Li4Ti5O12 WITH SOL GEL METHOD AS A LITHIUM ION-BATTERY ANODE MATERIAL Slamet Priyono Ilma Nuroniah Achmad Subhan Edi Sanjaya Bambang Prihandoko Li4Ti5O12 anode Sol gel method Lithium Ion Battery SYNTHESIS AND CHARACTERIZATION OF Li4Ti5O12 WITH SOL GEL METHOD AS A LITHIUM ION-BATTERY ANODE MATERIAL. Synthesis of anode Li4Ti5O12 material has been carried out using the sol gel method. The synthesis is carried out with variations in sintering temperatures at 500 oC, 600 oC, 700 oC dan 800 oC. Characterization carried out includes testing thermal analysis to determine the optimum temperature for sintering, XRD (X-ray Diffraction) to find out the phase formation of Li4Ti5O12, Scanning electron microscope (SEM) to analyse the morphology formed, testing Cyclic voltammetry, charge-discharge and Electrochemical Impedance Spectroscopy (EIS) is carried out to find out the elec- trochemical performance. From the results of characterization of thermal and XRD analyses, the optimum temperature for synthesis is 800oC with small impurity content. The results of SEM characterization show that the morphology of the sample is not homogeneous, and the particles are agglomerated. The resulting electrochemical performance increases along with the increase in temperature for sintering, including voltammogram graphs, diffusion coefficient values, electrical conductivity and charge-discharge capacity. Of all the samples, the LTO sintered at 800oC shows good electrochemical performance with a sharp and good voltammogram graph, diffusion coefficient value of lithium ion is 1.58 × 10-9 cm2s-1, electrical conductivity of 0.6282 S/cm and the discharge capacity given is 78,07 mAh/g. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5948 10.17146/jsmi.2019.20.2.5448 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 67-74 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5948/4375 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5949 2026-11-02T04:29:41Z jsmi:ART

ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK Adel Fisli Rahma Dina Safitri Nurhasni Deswita Nanopartikel Fe3O4 Karbon aktif Komposit Limbah kertas Adsorben magnetik ANALISIS STRUKTUR DAN POROSITAS KOMPOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK. Komposit partikel magnet-karbon aktif dari limbah kertas telah berhasil dibuat. Karbon aktif dibuat dengan cara bahan kertas bekas dibakar dan selanjutnya direndam dalam asam kuat. Komposit Fe3O4-karbon aktif dibuat dengan mencampurkan garam besi Fe3+/Fe2+ (rasio mol 2 : 1) dengan suspensi karbon aktif dalam air. Larutan campuran garam besi-karbon aktif ditambahkan larutan NaOH tetes demi tetes pada kondisi suhu 70 oC. Analisis struktur, morfologi, ikatan kimia, sifat magnet dan porositas diselidiki dengan berbagai alat, berturut-turut menggunakan alat XRD, SEM, FTIR, VSM dan adsorpsi-desorpsi N2 Quantasorb. Hasil karakterisasi menunjukkan bahwa nanopartikel Fe3O4 telah berhasil tercangkok pada struktur karbon melalui interaksi gugus hidroksil. Bahan komposit mempunyai sifat magnetik berkelakuan superparamagnetik. Keberadaan nanopartikel Fe3O4 pada struktur karbon membentuk sistem mesopori baru, dimana volume pori meningkat dari 0,07 cc/g menjadi 0,464 cc/g (meningkat 6 kali untuk karbon tanpa aktivasi dan meningkat dari 0,1053 cc/g menjadi 0,525 cc/g (meningkat 5 kali) untuk karbon aktivasi dengan sebaran ukuran pori rata-rata 17,5 nm. Hasil uji adsorpsi menunjukkan bahwa senyawa fenol dan metil jingga hanya mampu diserap 30% dalam larutan air, tetapi untuk senyawa metilen biru mampu diserap 96,3% pada kondisi yang sama. Bahan komposit partikel magnet Fe3O4/karbon aktif limbah kertas dapat digunakan sebagai bahan alternatif menghilangkan zat warna metilena biru dalam limbah cair. BRIN Publishing (Penerbit BRIN) 2018-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5949 10.17146/jsmi.2018.19.4.4886 Jurnal Sains Materi Indonesia; Vol. 19 No. 4 (2018): Jurnal Sains dan Materi Indonesia; 179-187 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5949/4374 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5953 2026-11-02T04:41:51Z jsmi:ART

THE POTENTIAL OF INDONESIAN GRAPHITE AS RDE FUEL MATRIX Deni Mustika Sudirman Adel Fisli Torowati I Made Joni Th. Rina M. Natural graphite matrix fuel PBR RDE characterization THE POTENTIAL OF INDONESIAN GRAPHITE AS RDE FUEL MATRIX. The development plan of Ex- perimental Power Reactor (RDE) in Indonesia is non-commercial and leads to the technology type of Pebble Bed Reactor (PBR) - High Temperature Gas Cooled Reactor (HTGR). The fuel used for PBR reactors is kernel dispersed in spherical fuel elements. The matrix used in PBR nuclear fuel is graphite which functions as a neutron moderator, fuel protective material and heat conductor. Domestication of the domestic fuel matrix needs to be conducted to improve national independence. Therefore, it is necessary to do research on the potential of local graphite to be used as RDE fuel matrix. This study focused on the identification and characterization of local and commercial graphite. The results are compared with the literature, how far it is fulfilling nuclear grade graphite for PBR fuel matrix. Characterization of graphite includes phase analysis with XRD, micro- structure with SEM, surface area/porosity, impurities determination with AAS, ICP-OES and NAA, equivalent boron content, carbon content, density, particle size distribution and ash content. The characterization results show that the carbon content obtained was 87.0 ± 4.2% for local graphite and 100% for commercial graphite. Meanwhile, for the purposes of nuclear graphite it requires a carbon content of >99%. The impurity content in local and commercial graphite still does not meet the RDE fuel matrix standard. The results of XRD analysis show that the local graphite phase is the same as the commercial graphite phase, namely the 2H graphite hexagonal crystal system with the lattice group of P 63/mmc. Particle size distribution and surface area of local graphite are higher compared to nuclear graphite literature. The ash content of commercial graphite was 0.236 ± 0.029 and local graphite was 9.587 ± 0.010%. The results of this study indicate that the local graphite from the flotation still requires a further refinement process to obtain local graphite that can be used as a fuel matrix for RDE. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5953 10.17146/jsmi.2019.20.2.5472 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 75-82 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5953/4377 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5957 2026-11-02T04:41:51Z jsmi:ART

THE EFFECT OF CALCINATION ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE Adel Fisli Didin S. Winatapura Wisnu Ari Adi Yana Taryana RAM(radar absorbing material) composite titanium magnetite calcination effect THE EFFECT OF CALCINATION  ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE. The Fe3O4/TiO2 composites have been fabricated by simple precipitation method for microwave absorbing. The obtained powder of Fe3O4/TiO2 which 10 % iron oxide containing were calcinated from 300oC – 700oC for 3 hours. The characteristic of samples was investigated by various techniques. The TEM image showed the composites form agglomeration with particles size of around 20 nm.  The all sample contents most of the anatase phase. The increasing of calcination temperature is the bigger of crystallite size. The Raman bands shift towards lower wavenumber and their full-widths at half-maximum (FWHM) of the bands decreases as the particles size increase. The measurement of the magnetic properties illustrated that the Fe3O4/TiO2 exhibited paramagnetic behavior at room temperature. The microwave absorbing properties of the sample was measured by VNA  using frequency microwave filter in  X-band range  (8-12 GHz). The reflection loss (RL) values were calculated for thickness 1 mm of the sample. The minimum reflectivity peak value tends to decrease with the increase of the calcination temperature due to increasing the crystallite size of the particles. The lowest reflectivity value of Fe3O4/TiO2 was occurred calcinated at 600oC with -13.4 dB loss at 10.9 GHz, that is more 80% absorbed of the electromagnetic wave in thickness 1 mm of the sample. The microwave absorption properties the calcinated 700oC the sample decrease due to the loss of magnetic properties of the sample. This study concluded that increase in average crystalline size, microwave absorption properties increased. However, the decrease dratisly of magnetic properties of the sample causes microwave absorption properties to decrease. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5957 10.17146/jsmi.2019.20.2.5292 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 83-88 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5957/4381 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5960 2026-11-02T04:41:51Z jsmi:ART

STUDY OF CERIA STABILIZED ZIRCONIA MICROSPHERES MORPHOLOGY BY SMALL-ANGLE SCATTERING AND MICROSCOPY Andon Insani Arum Patriati Nadi Suparno Ratih Langenati Siriwat Soontaranoon Ridwan microspheres neutron scattering technique nanostructure STUDY OF CERIA STABILIZED ZIRCONIA MICROSPHERES MORPHOLOGY BY SMALL-ANGLE SCATTERING AND MICROSCOPY. Ceria stabilized zirconia microspheres of about 500 microns were prepared by external gelation. The morphology in nano and micro scale of the microsphere was evaluated. The nanostructure of CSZ microsphere after drying was studied by small angle neutron and x-ray scattering (SANS and SAXS). In this state, the existing of the mixture of ceria oxide and zirconia oxide was observed inside the polymer matrix. The roundness and surface properties of the CSZ microsphere were observed under the optical microscopy (OM) and scanning electron microscopy (SEM). The data showed their good size uniformity, smooth surface, but also the imperfect phase of the gelation. BRIN Publishing (Penerbit BRIN) 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5960 10.17146/jsmi.2019.20.2.5474 Jurnal Sains Materi Indonesia; Vol. 20 No. 2 (2019): Jurnal Sains dan Materi Indonesia; 89-92 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5960/4383 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5964 2026-10-30T09:14:47Z jsmi:ART

PENGARUH SUHU PIROLISIS CANGKANG SAWIT TERHADAP KUANTITAS DAN KUALITAS ASAP CAIR Ratnawati Singgih Hartanto Singgih Hartanto Cangkang sawit Pirolisis Kondensasi Asap cair PENGARUH SUHU PIROLISIS CANGKANG SAWIT TERHADAP KUANTITAS DAN KUALITAS ASAP CAIR. Pembuatan asap cair merupakan salah satu usaha pemanfaatan cangkang sawit menjadi produk yang mempunyai nilai guna, dilakukan dengan cara mengkondensasi asap yang terbentuk dari proses pirolisis cangkang sawit. Dalam penelitian ini diproduksi asap cair dari hasil pirolisis 5 kg cangkang sawit pada suhu 200 °C, 300 °C dan 400 °C selama 4 jam, dan komposisi asap cair yang diperoleh dianalisis dengan alat Gas Chromatography-Mass Spectrometry (GC-MS). Berdasarkan hasil penelitian dapat diketahui bahwa pirolisis pada suhu 200 °C, 300 °C dan 400 °C, didapatkan volume asap cair masing masing sebanyak 460 mL, 510 mL dan 550 mL dengan rendemen arang sebesar 3,98 kg, 3,24 kg dan 1,49 kg. Komponen asap cair hasil pirolisis pada suhu 200 °C yang bisa digunakan sebagai antioksidan dan menambah citarasa makanan (guaiacol, 2,3-butanedione, furfural dan 2-methyl-2-cyclopentenone) sebesar 30,73 %berat dan komponen yang berbahaya bagi kesehatan (phenol , 2-propanone, 2-butanone dan cyclopentanone) sebesar 34,31 %berat. Sedangkan pada suhu 400 °C diperoleh komponen yang bisa digunakan pada produk makanan sebesar 27,39 %berat dan komponen yang berbahaya sebesar 26,51 %berat. Asap cair yang diperoleh dari penelitian ini belum dapat digunakan pada produk makanan karena masih terdapat senyawa yang berbahaya bagi kesehatan sehingga perlu proses pemisahan lebih lanjut BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5964 10.17146/jsmi.2010.12.1.4551 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 7-11 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5964/4384 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5965 2026-10-30T09:14:47Z jsmi:ART

PEMBUATAN KARBON AKTIF DARI TEMPURUNG KELAPA SAWIT DENGAN METODE AKTIVASI KIMIA Singgih Hartanto Ratnawati Tempurung kelapa sawit Karbon aktif Aktivasi kimia Karbonisasi PEMBUATAN KARBON AKTIF DARI TEMPURUNG KELAPA SAWIT DENGAN METODE AKTIVASI KIMIA. Berlimpahnya tempurung kelapa sawit sebagai hasil samping dari industri minyak sawit mendorong keinginan untuk meningkatkan nilai ekonomi bahan tersebut yang selama ini hanya digunakan sebagai bahan bakar. Salah satu upaya yang dilakukan adalah pemrosesan tempurung kelapa sawit menjadi karbon aktif. Bahan karbon aktif ini banyak digunakan dalam industri khususnya di bidang perminyakan, pengolahan air, industri gas, makanan dan minuman, obat-obatan dan industri kimia. Penelitian ini bertujuan untuk membuat karbon aktif dari tempurung kelapa melalui proses karbonisasi dan aktivasi secara kimia. Proses karbonisasi dilakukan pada suhu 300 oC, 450 oC dan 500 oC dengan waktu 1 jam, 1,5 jam, 2,0 jam, 2,5 jam dan 3 jam. Sedangkan proses aktivasi dilakukan dengan menggunakan aktivator NaOH, NaCl, dan HCl dengan konsentrasi 2 % dan aktivasi selama 1 jam, 2 jam dan 4 jam pada 500 oC. Proses karbonisasi menunjukkan hasil terbaik pada suhu 500 oC dan waktu 3 jam dengan kadar air 18 %, rendemen 23 %, zat yang mudah menguap 3 % dan kadar karbon terikat 61 %. Aktivasi dengan NaOH selama 4 jam menunjukkan hasil terbaik dengan kadar air arang aktif 3,6 % dan daya serap I2 851,8797 mg/g. Hasil Scanning Electron Microscope (SEM) menunjukkan bahwa sebelum aktivasi pori yang terbentuk masih tertutup oleh pengotor-pengotor dan setelah aktivasi pori tersebut lebih terbuka sehingga luas permukaan adsorpsi menjadi lebih besar. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5965 10.17146/jsmi.2010.12.1.4588 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 12-16 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5965/4385 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5967 2025-03-27T16:53:53Z jsmi:Ed

Front Matter (Editorial Team, Preface and Table of Contents) Rahman, Andri - BRIN Publishing (Penerbit BRIN) 2024-08-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/5967 Jurnal Sains Materi Indonesia; Vol. 26 No. 1 (2024): Jurnal Sains dan Materi Indonesia; i-v 2614-087X 1411-1098 10.55981/jsmi.v26i1 eng https://ejournal.brin.go.id/jsmi/article/view/5967/4386 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5968 2026-10-30T09:14:47Z jsmi:ART

SINTESIS DAN KARAKTERISASI SELULOSA ASETAT DARI NATA DE COCO SEBAGAI BAHAN BAKU MEMBRAN ULTRAFILTRASI Muhammad Lindu Tita Puspitasari Tita Puspitasari Tita Puspitasari Tita Puspitasari Tita Puspitasari Tita Puspitasari Tita Puspitasari Selulosa asetat Nata De Coco Selulosa Mikrobial Membran Ultrafiltrasi SINTESIS DAN KARAKTERISASI SELULOSA ASETAT DARI NATA DE COCO SEBAGAI BAHAN BAKU MEMBRAN ULTRAFILTRASI. Penelitian ini bertujuan untuk memperoleh bahan baku membran berupa selulosa asetat yang berasal dari Nata de Coco. Nata De Coco (selulosa mikrobial) dengan ketebalan 3 mm hingga 5 mm diperoleh dengan cara fermentasi limbah air kelapa selama 6 hari. Selulosa mikrobial (CA-1) direndam dalam 2% NaOH selama 24 jam kemudian dicuci dengan aquadest. Perendaman dilanjutkan menggunakan 2% asam asetat selama 24 jam. Selulosa mikrobial (CA-2) diperlakukan sama dengan CA-1 tetapi menggunakan 4% NaOH dan asam asetat. Selulosa asetat diperoleh melalui proses asetilasi dan hidrolisis selulosa mikrobial selama 20 jam. Selulosa asetat yang dihasilkan didominasi selulosa triasetat dengan kadar asetil sebesar 45,20% untuk CA-1 dan 44,21% untuk CA-2. Analisis spektrum FT-IR menunjukkan adanya serapan khas gugus C=O karbonil pada bilangan gelombang 1755,2 cm-1 (CA-1) dan 1752,25 cm-1 (CA-2) serta gugus C-O asetil pada bilangan gelombang 1232 cm-1 himgga 1240 cm-1. Hal ini menunjukkan proses sintesis selulosa mikrobial menjadi selulosa asetat terjadi dengan sempurna. Membran selulosa asetat diperoleh dengan cara melarutkan serbuk selulosa asetat menggunakan pelarut diklorometan, dilanjutkan dengan proses presipitasi imersi. Morfologi membran diuji dengan SEM dan hasilnya menunjukkan bahwa membran CA-1 mempunyai struktur pori lebih besar dari pada membran CA-2. Ukuran pori membran CA-1 adalah antara 0,009 m hingga 0,06 μm, sedangkan membran CA-2 adalah antara 0,008 μm hingga 0,04 μm. Kedua membran yang dihasilkan dengan ketebalan masing-masing 0,015 mm tersebut termasuk membran ultrafiltrasi dengan karakteristik yang baik sebagai membran ultrafiltrasi. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5968 10.17146/jsmi.2010.12.1.4555 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 17-23 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5968/4387 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5972 2026-11-02T03:59:51Z jsmi:ART

PENGUJIAN KANDUNGAN LOGAM RENIK DAN KUALITAS GARAM ANEKA PANGAN HASIL PROSES KRISTALISASI LARUTAN BRINE Eriawan Rismana Zainuddin Garam aneka pangan kristalisasi larutan brine karakterisasi kualitas Garam aneka pangan merupakan salah satu jenis garam yang masih diimpor. Untuk substitusi impor maka diperlukan pengembangan teknologi proses produksi garam tersebut di dalam negeri. Dalam penelitian ini telah dilakukan kajian produksi garam aneka pangan menggunakan proses kristalisasi dengan bahan baku larutan brine sisa produksi garam farmasi. Hasil uji garam aneka pangan secara uji kualitatif meliputi reaksi nyala, uji kation natrium dan anion klorida, uji kelarutan, pengamatan bentuk kristal secara mikroskopi dan pola difraktogram XRD menunjukkan hasil yang sama dengan data MSDS NaCl. Sedangkan pengujian kandungan logam renik dan kualitas pada garam tersebut menunjukkan bahwa produk telah memenuhi pesyaratan kualitas antara lain kandungan NaCl, magnesium, kalsium, sulfat, air, dan logam berat sesuai Peraturan Menteri Perindustrian No. 88/M-IND/PER/10/2014. BRIN Publishing (Penerbit BRIN) 2017-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5972 10.17146/jsmi.2017.19.1.4150 Jurnal Sains Materi Indonesia; Vol. 19 No. 1 (2017): Jurnal Sains dan Materi Indonesia; 39-44 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5972/4390 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5973 2026-11-02T04:37:07Z jsmi:ART

THE EFFECT OF OXIDATION ON SAGO STARCH AND ITS APPLICATION AS EDIBLE FILM Dewi Sondari Evi Triwulandari Muhammad Ghozali Yulianti Sampora Imad Iltizam Nanang Masruchin Oxidation Hydrogen peroxide Physicochemical properties Edible film Hydrophobicity THE EFFECT OF OXIDATION ON SAGO STARCH AND ITS APPLICATION AS EDIBLE FILM. The oxidation reaction with hydrogen peroxide in sago starch can influence the proximate test value, physicochemical properties and edible film properties. The hydrogen peroxide formula for starch modifica- tion is 1, 2, 3 and 4%. The presence of hydrogen peroxide increases the physicochemical properties of sago starch so that the quality of modified sago starch is better than pure sago starch. Glycerol is used to improve film flexibility in the manufacture of edible coatings. The characterization of edible film includes water content, contact angle and elongation. Edible film from modified sago starch shows lower water content compared to pure sago starch films. The oxidation effect of H2O2 on edible film results in changes in the hydrophilic properties including the contact angle. Edible film of pure sago starch shows a lower contact angle value. The hydrophilic nature of edible film decreases in the presence of hydrogen peroxide. The high hydrophobicity of the modified sago starch film is caused by the role of carboxyl groups in the starch molecule chain. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5973 10.17146/jsmi.2018.20.1.5388 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 1-7 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5973/4392 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5976 2026-10-30T06:25:06Z jsmi:ART

PERFORMANCE EVALUATION OF BACTERIAL CELLULOSE REINFORCED POLYETHYLENE COMPOSITES L. Indrarti R.Yudianti A. Syampurwadi M. Karina Bacterial cellulose Polyethylene Composites Mechanical properties PERFORMANCE EVALUATION OF BACTERIAL CELLULOSE REINFORCED POLYETHYLENE COMPOSITES. This paper discusses the influence of bacterial cellulose reinforced polyethylene composites on the physical and mechanical properties. Composites consisting of polyethylene and bacterial cellulose were prepared by extrusion and compression process. The content of bacterial cellulose subjected to polyethylene was set from 0-50 (w/w)% with the addition of 2 % Polyethylene Maleic Anhydride (MAPE). The effect of bacterial cellulose content in the composites was evaluated. The tensile strength and elongation at break of composite declined with increasing of bacterial cellulose, but the Young’s modulus increased, demonstrating that composite becoming more rigid. At 23 oC 50 % RH, tensile strength, break strain and modulus of elasticity of polyethylene was 21.2 MPa, of 270 % and 763 MPa respectively. With the bacterial cellulose loading up to 50 %, tensile strength dropped to be half, break strain to be less than 0.5 %, but Young’s modulus increased more than 230 %. In addition, the composite became more hydrophilic and more amorphous loading with bacterial cellulose. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5976 10.17146/jsmi.2012.13.2.4681 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 77-82 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5976/4391 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5977 2026-11-02T04:37:07Z jsmi:ART

THE EFFECT OF ADDITIVES AND REDUCTORS IN SELECTIVE REDUCTION PROCESS OF LATERITE NICKEL ORE F. Nurjaman A. Sa’adah A. Shofi W. Apriyana B. Suharno Laterite nickel ore Selective reduction Ferronickel Sodium sulfate Anthracite coal Palm shell charcoal THE EFFECT OF ADDITIVES AND REDUCTORS IN SELECTIVE REDUCTION PROCESS OF LATERITE NICKEL ORE. Selective reduction of laterite nickel ore followed by magnetic separation was carried out to produce ferronickel products. The effect of adding additives and reductor types in the selective reduction process was studied in this study. Reductors used were anthracite coal and palm shell charcoal with variations of 5 to 15% by weight, while the additive used was sodium sulfate (Na2SO4). The reduction process was carried out at temperatures of 950 ºC, 1050 ºC and 1150 ºC for 60 minutes. The addition of 10% sodium sulfate additives by weight in the reduction process of laterite nickel ore produced higher concentrations of nickel as 6.09%, compared to no additives, i.e. 2.45%. The addition of reductors in the selective reduction process of laterite nickel ore shows that the higher the amount of reductors causes a decrease in the concentrate level of nickel. Furhtermore, the type of reductors used shows that the concentrate from the reduction result using anthracite coal reductor produces higher level of nickel and lower level of iron compared to the use of palm shell charcoal reductor. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5977 10.17146/jsmi.2018.20.1.5404 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 8-14 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5977/4393 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5978 2026-11-02T04:37:07Z jsmi:ART

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD Ibrahim Purawiardi Etty Marti Wigayati Li1.37Mn2O4 Spinel Crystal structure Hydrothermal FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD. Li1.37Mn2O4 is one form of Li1+xMn2O4 which is engineered from LiMn2O4 phase which is commonly used as a lithium cathode active ingredient. The crucial thing from Li1.37Mn2O4 synthesis is the spinel structure that is formed. This study aims to observe when the spinel structure of Li1.37Mn2O4 starts and when the transformation from a tetragonal structure into spinel occurs. The raw materials used are tetragonal LiOH and tetragonal MnO2. The synthesis was carried out using a hydrothermal method with a temperature of 200 oC with a variation of holding times of 50, 70, 90 and 110 hours. Observation of spinel structure was carried out using XRD and TEM. The results obtained were at the holding times of 50 and 70 hours, the spinel structure had not been formed. The spinel structure begins to form at 90 hours holding time which also indicates that the transformation from the tetragonal structure to spinel occurs at such holding time. The result of a 90-hour holding time is a regular spinel structure but there are still many Mn and Mn-O –based impurities. While the results of the 110-hour holding time produce a perfect yet irregular transformation of the spinel structure. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5978 10.17146/jsmi.2018.20.1.5405 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 15-20 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5978/4415 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5979 2026-11-02T03:55:11Z jsmi:ART

KARAKTERISASI SIFAT TERMAL DAN OPTIK POLYDIMETHYLSILOXANE SEBAGAI LENSA INVERS Yenny Meliana Andinnie Juniarsih Juvitha Anggraini Polydimethylsiloxane Suhu Tetesan Dripping Intensitas Cahaya Light Intensity Termal Thermal CHARACTERIZATION THERMAL AND OPTICAL PROPERTIES OF POLYDIMETHYL SILOXANE AS LENS INVERSE. Polydimethylsiloxane (PDMS) is stable silicone rubber by physical and chemical. This material available by commercially. PDMS is a polymer material has a refractive index of 1.47 to 1.55 and high transparency till 95% that it best used as simple optical instruments such as an inverse lens. The aims this study is to create the inverse lens of PDMS and investigated the optical and thermal properties this polymer. Step researches are mixing, dripping, invers, and curing. Mixing is done by PDMS base with PDMS curing agent in ratio 10:1. Then dripping on a glass slide and then inverted with variations droplets is 2, 3, and 4 drops. Curing has variations temperature is 70, 80, and 90°C. Characterizations are use SEM, lux meter, and TGA. The result of lux meter analysis is the lower temperature can be higher light intensity. SEM showed bubbles on the lens which the more high volume of lens can be more less bubbles on the lens. TGA analysis showed there is no significant change for value of degradation (Td) for the curing temperature in the range 70°C to 90°C. The best results are used with a variety of 4 drops at temperature of 70°C with value of intensity at 177 lux and value of Td at 301,5°C. ABSTRAK KARAKTERISASI SIFAT TERMAL DAN OPTIK POLYDIMETHYLSILOXANE SEBAGAI LENSA INVERS. Polydimethylsiloxane (PDMS) adalah karet silikon yang stabil secara fisik dan kimia dan telah tersedia komersial. PDMS merupakan material polimer dengan rentang indeks bias 1,47-1,55 dan mempunyai karakter transparansi yang tinggi mencapai 95% sehingga bahan ini baik digunakan sebagai alat optik sederhana berupa lensa invers. Penelitian ini bertujuan untuk membuat lensa invers dari polimer PDMS serta mengetahui sifat optik dan termalnya. Tahapan penelitian lensa invers meliputi : pencampuran antara base PDMS dengan curing agent PDMS dengan perbandingan 10:1, kemudian dilakukan proses penetesan diatas slide kaca lalu dibalikkan (invers) dengan variasi jumlah tetesan 2, 3 dan 4 drop dan terakhir dilakukan proses curing dengan variasi suhu curing 70°C, 80°C, dan 90°C. Karakterisasi bahan meliputi analisis morfologi lensa menggunakan SEM/EDX, intensitas cahaya menggunakan luxmeter serta analisis nilai transtition glass (Tg) menggunakan TGA/DTA. Hasil karakterisasi analisis luxmeter menunjukkan semakin rendah suhu curing semakin tinggi intensitas cahaya yang dapat menembus lensa. Foto SEM memeperlihatkan adanya gelembung pada lensa. Semakin besar volume lensa maka semakin sedikit gelembung pada lensa. Hasil analisis menggunakan TGA memperlihatkan untuk rentang suhu pemanasan antara 70°C hingga 90°C nilai suhu degradasi (Td) lensa invers tidak berpengaruh signifikan. Hasil penelitian ini menunjukkan bahwa lensa yang baik adalah pada variasi 4 tetes dan suhu curing 70 °C dengan nilai intensitas 177 lux dan nilai Td sebesar 301,5°C. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5979 10.17146/jsmi.2017.18.4.4149 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 155-161 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5979/4394 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5980 2026-10-30T06:25:06Z jsmi:ART

ANALISIS FASA DAN STRUKTURMIKRO PADA TEPUNG TAPIOKA DENGAN PENAMBAHAN NATRIUM METABISULFIT. Husniati Wisnu Ari Adi Tapioka Derajat putih Natrium metabisulfit ANALISIS FASA DAN STRUKTURMIKRO PADA TEPUNG TAPIOKA DENGAN PENAMBAHAN NATRIUM METABISULFIT. Telah dilakukan analisa fasa dan strukturmikro tepung tapioka dengan penambahan Natrium metabisulfit Na2S2O5 yang bertujuan untuk meningkatkan derajat putih tapioka sesuai yang dipersyaratkan SNI 01-3729-1995 bagi Industri kecil dan menengah. Hasil analisis penentuan derajat putih diperoleh sampel dengan penambahan Natrium metabisulfit 0 %; 0,1 %; 0,2 %; 0,5 % dan 1,0 % (dalam persen berat) berturut-turut sebesar 90,3 %; 91,8 %; 94,9 %; 95,7 % dan 96,2 %. Hasil refinement difraksi sinar-X menunjukkan bahwa sampel terdiri dari 2 fasa utama, yaitu : α-Amilosa dan β-D-Glukosa. Hal ini diduga kuat bahwa reaksi pembentukan browning pada tepung tapioka berasal dari fasa α-amilosa. Hasil pengamatan menggunakan Scanning Electron Microscope (SEM) menunjukkan bahwa sampel tapioka dengan penambahan 0,2 %Na2S2O5 hampir keseluruhan didominasi warna putih dengan distribusi partikel sangat merata. Disimpulkan bahwa Na2S2O5 dapat meningkatkan fasa β-D-Glukosa sehingga dapat mencegah terjadinya reaksi browning pada tepung tapioka. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5980 10.17146/jsmi.2012.13.2.4683 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 83-89 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5980/4395 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5981 2026-11-02T03:55:11Z jsmi:ART

BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK DAUN SAMBILOTO: OPTIMASI PROSES DAN KARAKTERISASI Nyoman Wendri Ni Nyoman Rupiasih Made Sumadiyasa Nanopartikel Perak Silver Nanoparticles Biosintesis Biosynthesis Optimasi Optimation Daun Sambiloto Sambiloto SPR FCC BIOSYNTHESIS OF SILVER NANOPARTICLES USING SAMBILOTO LEAF EXTRACT : OPTIMIZATION PROCESS AND CHARACTERIZATION. It has been synthesized silver nanoparticles (AgNP) with biological method or biosynthesis, successfully. The synthesis is done using extract of Sambiloto leaf (Andrographis paniculata Ness). The study involved determining the optimum volume ratio of synthesis i.e. AgNO3 solution : extract solution and characterization of nanoparticles formed. The concentration of AgNO3 solution used was 1 M and extract solution was 7.5 g/L. The characterization included UV-Vis spectrophotometer, EDS, TEM, XRD and FT-IR spectrophotometer. The results obtained were, the optimum volume ratio of synthesis was 10 µL:10 mL. The characteristics of AgNP formed were the Surface Plasmon Resonance (SPR) absorbance at a wavelength of 423 nm. The diffraction peaks observed at angles 2θ of 38.180, 45.810 and 64.870 which corresponded to the hkl (1 1 1), (2 0 0) and (2 2 0). These results showed that the crystal structure of AgNP formed was face center cubic (FCC) with lattice parameter a, of 4.03 Å. TEM characterization showed that the size of AgNP nanoparticles was about 10-30 nm. ABSTRAK BIOSINTESIS NANOPARTIKELPERAK MENGGUNAKAN EKSTRAK DAUN SAMBILOTO : OPTIMASI PROSES DAN KARAKTERISASI. Pada penelitian ini telah berhasil disintesis nanopartikel perak (AgNP) dengan metode biologi (biosintesis). Sintesis dilakukan dengan menggunakan ekstrak daun Sambiloto (Andrographis paniculata Ness). Penelitian ini meliputi penentuan rasio volume sintesis (larutan AgNO3 : larutan ekstrak) yang optimum dan karakterisasi nanopartikel perak yang terbentuk. Konsentrasi larutan AgNO3 yang digunakan 1 M dan larutan ekstrak adalah 7,5 g/L. Karakterisasi meliputi spektrofotometer UV-Vis, EDS, TEM, XRD dan FT-IR. Hasil penelitian menunjukkan bahwa rasio volume sintesis optimum adalah 10 µL : 10 mL. Karakteristik nanopartikel perak yang diperoleh adalah absorbsi Surface Plasmon Resonance (SPR) pada panjang gelombang 423 nm. Puncak-puncak difraksi teramati pada sudut 2θ yaitu 38,180, 45,810 dan 64,870, yang bersesuaian dengan bidang hkl (1 1 1), (2 0 0) dan (2 2 0). Data tersebut menunjukkan bahwa nanopartikel perak yang terbentuk memiliki struktur kristal Face Centre Cubic (FCC) dengan parameter kisi a sebesar 4,03 Å. Hasil karakterisasi dengan TEM diperoleh ukuran partikel sekitar 10-30 nm. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5981 10.17146/jsmi.2017.18.4.4125 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 162-166 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5981/4396 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5982 2026-10-30T06:25:06Z jsmi:ART

INVESTIGATION CHARACTERISTICS OF PULP FIBERS AS GREEN POTENTIAL POLYMER REINFORCING AGENTS Nanang Masruchin Subyakto Pulp fibers Cellulose Characteristics Interface Composite INVESTIGATION CHARACTERISTICS OF PULP FIBERS AS GREEN POTENTIAL POLYMER REINFORCING AGENTS. Three kinds of pulp fiber (i.e. kenaf, pineapple and coconut fiber)were characterized as reinforcing agents in compositematerials to be applied at automotive interior industry.Abetter understanding on characteristics of fiber will lead to enhance interface adhesion between fiber and matrices. Furthermore, it will improve the properties of polymer significantly. Chemical, surface compositions as well as morphology of pulp fiber were investigated using TAPPI standard test method, Fourier Transform Infrared Spectroscopy (FT-IR) and optical microscopy, respectively. Further observation on morphology of the fiber was conducted by Scanning Electron Microscope (SEM). From this study, pineapple pulps showed the highest α-cellulose content than that of kenaf or coconut pulps. However, it has the lowest hemicellulose content among them. This condition takes responsibility for the difficulties of pineapple pulps defibrillation process.Much fines or external fibrillations are presence on both kenaf and pineapple pulp’s morphology, but it is not presence in the coconut pulps.Moreover, coconut fiber is shorter than the other two fibers with diameter size estimated in the order pineapple < kenaf < coconut pulps. FT-IR analysis shown quite similar absorption fromall pulps, except for coconut pulps due to the remaining lignin on the surface of fiber that showed by the presence of C-O phenol stretching at 1280 cm-1. Finally, it is reported that kenaf pulps fiber is suitable candidate for polymer reinforcing agents compared to pineapple and coconut pulps fiber. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5982 10.17146/jsmi.2012.13.2.4711 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 90-96 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5982/4397 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5983 2026-11-02T03:55:11Z jsmi:ART

PENGARUH SUHU DAN WAKTU PEMANASAN TERHADAP KARAKTERISTIK LAPISAN ELEKTROLES Ni-P PADA BAJA TAHAN KARAT MARTENSITIK SS 420 Bahtiar Nurhakim Arini Nikitasari Sunardi Efendi Mabruri Elektroles Electroless Nickel-Posfor Nickel-Phosfor Martensitik Martensitic Korosi Corrosion EFFECT OF TEMPERATURE AND HEATING TIME ON THE COATING CHARACTERISTICS OF MARTENSITIC SS 420 ELECTROLESS Ni-P. Electroless nickel phosphorus (Ni-P) coating has been done on the martensitic stainless steel SS 420 with a variety of temperature and heating time. Electroless Ni-P coating characteristics; microstructure and corrosion resistance were analyzed to determine the effect of variations in temperature and heating time. Variations in the temperature of the heat treatment used are 200°C, 300°C, 400°C and 500°C, while the variation of heating time is used, 60 minutes, 120 minutes and 180 minutes. The results showed that the rise in temperature and heating time causes electroless Ni-P coating becomes more uniform and corrosion resistance of material is also increasing. Nickel and phosphorus elements in electroless coating of Ni-P increased with heat treatment. The highest nickel and phosphorus elements obtained at 400°C heating temperature and 180 minute heating time. ABSTRAK PENGARUH SUHU DAN WAKTU PEMANASAN TERHADAP KARAKTERISTIK LAPISAN ELEKTROLES Ni-P PADA BAJA TAHAN KARAT MARTENSITIK SS 420. Telah dilakukan pelapisan elektroles Nikel-Posfor (Ni-P) pada baja tahan karat martensitik SS 420 dengan berbagai variasi suhu dan waktu perlakuan panas. Karakteristik lapisan elektroles Ni-P yang berupa struktur mikro dan ketahanan korosi dianalisis untuk mengetahui pengaruh variasi suhu dan waktu pemanasan. Variasi suhu perlakuan panas yang digunakan yaitu 200°C, 300°C, 400°C, dan 500°C, sedangkan variasi waktu pemanasan yang digunakan antara lain 60 menit, 120 menit, dan 180 menit. Hasil yang diperoleh menunjukkan bahwa kenaikan suhu dan waktu pemanasan menyebabkan lapisan elektroles Ni-P yang terbentuk menjadi lebih seragam dan ketahanan material terhadap korosi semakin meningkat. Terjadi peningkatan kadar unsur Nikel dan Posfor dalam lapisan elektroles Ni-P dengan adanya perlakuan panas. Kadar unsur Nikel dan Posfor tertinggi pada suhu pemanasan 400°C dan waktu pemanasan selama 180 menit. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5983 10.17146/jsmi.2017.18.4.4121 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 167-172 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5983/4398 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5984 2026-10-30T06:25:06Z jsmi:ART

ANALISIS STRUKTUR SELULOSA KULIT ROTAN SEBAGAI FILLER BIONANO KOMPOSIT DENGAN DIFRAKSI SINAR-X Siti Nikmatin Setyo Purwanto Akhirudin Maddu Tieneke Mandang Aris Purwanto Selulosa Ultrasonik Bionanokomposit Particle Size Analyzer X-Ray Diffraction ANALISIS STRUKTUR SELULOSA KULIT ROTAN SEBAGAI FILLER BIONANO KOMPOSIT DENGAN DIFRAKSI SINAR-X. Kulit rotan merupakan salah satu limbah pertanian yang dapat dimanfaatkan sebagai sumber serat untuk bionano komposit. Untuk menghasilkan bionanokomposit berbasis nanopartikel selulosa kulit rotan yang ringan, kuat, ulet, ramah lingkungan dan eksplorasi sumber daya alam dalam negeri diperlukan pengembangan metode baru sebagai solusi teknik yang mengedepankan kemampuan sistem yaitu nanoteknologi. Tujuan penelitian ini adalah analisis struktur kristal menggunakan X-Ray Diffraction (XRD) dan ukuran partikel dengan Particle Size Analyzer (PSA) nanopartikel selulosa kulit rotan (SKR) hasil ultrasonikasi yang akan digunakan sebagai filler pada bionanokomposit menggunakan injection moulding. SKR dibuat dengan sistem mekanik (pen disk milling dan elektromagnetik shaker) dalam ukuran 75 μm, dipanaskan 100 oC dan stirer 200 rpm selama 2 jam, dilanjutkan ultrasonikasi pada 20 kHz, dengan variasi waktu 1 jam, 2 jamdan 3 jam. Hasil pengujian PSA menunjukkan ukuran partikel diameter 146,3 nm(number distribution 32%) untuk waktu ultrasonikasi 3 jam. Sementara itu analisis struktur kristal menunjukkan bahwa SKR berstruktur kristal monoklinik berfasa -selulosa. Apparent Crystal Size (ACS) dan micro strain (η) nanopartikel SKR adalah ACS = 151,95 dan η = 0,0001. Pemberian nanopartikel SKR pada matriks polipropilen (PP) menggunakan injection mouding menghasilkan sifat mekanik (impact dan hardness) bionanokomposit lebih baik dari pembandingnya yaitu komposit sintetik berfiber glass. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5984 10.17146/jsmi.2012.13.2.4712 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 97-102 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5984/4399 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5985 2026-11-02T03:55:11Z jsmi:ART

INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL M. Dani Parikin R. Iskandar A. Dimyati Ferritic Fe-24Cr-2Si-0.8Mn Alloy Paduan Feritik Fe-24Cr-2Si-0.8Mn FIB SEM TEM EDX STEM HRTEM INVESTIGATION ON PRECIPITATIONS AND DEFECTS OF THE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL. A ferritic Fe-24Cr-2Si-0.8Mn alloy was produced from granular ferro-scrap, ferrochrome, ferrosilicon and ferromanganese in a conventional induction furnace. The alloy is dedicated for application as structure material in high temperature devices, such as nuclear reactor vessel and heat exchanger. The alloy has been verified to have high tensile strength and high resistant against corrosion. The aim of this work is to study the microstructures, chemical compositions and precipitation occurred inside grain and grain boundary of the alloy, to obtain more information of its superior physical-chemical properties. STEM-EDX mappings reveal the present of relatively large aluminum oxide, silicon carbide and high oxygen and high carbon containing precipitations on the specimens. The grains that were formed, exhibit relatively strong deformations as obviously shown by the elongated grains and sub-grains with typical high density of dislocations, even though, less mechanical treatments applied. Small porosities are also present homogeneously separated on the whole view area. ABSTRAK INVESTIGASI TERHADAP PENGENDAPAN DAN KERUSAKAN PADA BAJA PADUAN SUPER FERRITIC Fe-24Cr-2Si-0,8Mn. Paduan Fe-24Cr-2Si-0,8Mn feritik dihasilkan dari granular ferro-scrap, ferrochrome, ferrosilicon dan ferromanganese dalam tungku induksi konvensional. Paduan ini didedikasikan untuk aplikasi sebagai bahan struktur pada perangkat suhu tinggi seperti bejana reaktor nuklir dan heat exchanger. Paduan telah diverifikasi memiliki kekuatan tarik tinggi dan tahan terhadap korosi. Tujuan dari penelitian ini adalah untuk mendalami struktur mikro, komposisi kimia dan presipitasi yang terjadi di dalam batas butir dan butir paduan, untuk mendapatkan lebih banyak informasi sifat fisik-kimia superior. Pemetaan STEM-EDX mengungkapkan adanya oksida aluminium yang relatif besar, silikon karbida dan oksigen tinggi dan presipitasi tinggi yang mengandung karbon pada spesimen. Butiran yang terbentuk, menunjukkan deformasi yang relatif kuat seperti yang ditunjukkan oleh butiran dan sub-butiran memanjang dengan kepadatan dislokasi yang khas, walaupun sedikit mendapat perlakuan mekanik. Porositas kecil juga berada secara merata terpisah pada keseluruhan daerah yang diamati. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5985 10.17146/jsmi.2017.18.4.4123 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 173-178 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5985/4403 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5986 2026-10-30T06:25:06Z jsmi:ART

APLIKASI DIFRAKSI SINAR-X UNTUK KARAKTERISASI CdS/POLIMER NANO KOMPOSIT DAN STABILITAS CdS/APTMS-Al-MCM-41 NANO KOMPOSIT Eriawan Rismana Hadi Nur Salasiah Endud Difraksi sinar-X CdS/Polimer CdS/APTMS-Al-MCM-41 APLIKASI DIFRAKSI SINAR-X UNTUK KARAKTERISASI CdS/POLIMER NANO KOMPOSIT DAN STABILITAS CdS/APTMS-Al-MCM-41 NANO KOMPOSIT. Karakterisasi nanopartikel Kadmium Sulfida (CdS) pada nanokomposit CdS/Polimer dan stabilitas pola difraktogramstruktur mesopori dariAl-MCM-41 pada nanokomposit CdS/APTMS-Al-MCM-41 telah dilakukan denganmenggunakan teknik difraksi sinar-X. Polimer yang digunakan adalah poli(steren-divinilbenzen) tersulfonasi [SO3H-P(S-DVB)]. Keberadaan nano partikel CdS dalam CdS/SO3H-P(S-DVB) ditunjukkan oleh adanya puncak lebar pada difraktogram di posisi 2θ = 26,40° ; 43,75° dan 52,00° yang sesuai dengan pola difraktogram CdS nano bentuk kubik (111), (220) dan (311). Sedangkan stabilitas pola difraktogramdari CdS/APTMS-Al-MCM-41 ditunjukkan oleh adanya puncak tajam pada difraktogram di posisi 2θ = 2,1° (100) dan 3 puncak lemah di 2θ = 3,7° (110), 4,3° (200) dan 5,5° (210) yang menunjukkan pola difraktogram Al-MCM-41 sebagai matriks host dari CdS/APTMS-Al-MCM-41. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5986 10.17146/jsmi.2012.13.2.4713 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 103-107 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5986/4401 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5987 2026-10-30T03:41:57Z jsmi:ART

NANOSERAT POLIANILIN SEBAGAI CLADDING TERMODIFIKASI PADA SENSOR SERAT OPTIK UNTUK DETEKSI UAP ASETON Akhiruddin Maddu Hamdani Zain Ahmad Aminuddin Setyanto Tri Wahyudi Sensor serat optik Cladding polianilin Nanoserat Uap aseton Pada penelitian ini digunakan bahan nanoserat polianilin sebagai cladding termodifikasi pada sistem sensor serat optik untuk mendeteksi uap aseton. Sensor ini dirancang berdasarkan perubahan absorpsi medan evanescent pada bidang batas inti-cladding polianilin akibat perubahan sifat optiknya ketika diekspos dengan uap aseton. Nanoserat polianilin yang disintesis dengan metode polimerisasi interfasial, dilapiskan pada bagian inti serat optik yang telah dilepas cladding aslinya dan berfungsi sebagai bagian penginderaan (sensing element). Respon sensor serat optik diuji dengan mengukur intensitas transmisi cahaya yang melewati sistem sensor serat optik saat diekspos dengan uap aseton. Berdasarkan kurva respon sensor diperoleh waktu respon 30 detik dan waktu pemulihan (recovery) 10 detik. Sensor serat optik ini juga memperlihatkan kemampuan balik (reversibility) dan pengulangan (repeatability) yang cukup baik. Sensitivitas sensor terhadap tekanan uap aseton dihasilkan sebesar 1,25 %/mmHg, artinya besar perubahan intensitas transmisi untuk setiap perubahan 1 mmHg adalah 1,25 %. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article https://ejournal.brin.go.id/jsmi/article/view/5987 10.17146/jsmi.2008.9.3.4701 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 220-225 2614-087X 1411-1098 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5988 2026-10-30T03:41:57Z jsmi:ART

STUDI FASA DAN SIFAT MAGNETIK NANOPARTIKEL OKSIDA BESI HASIL PROSES EMULSI Siti Wardiyati Nanopartikel oksida besi Proses emulsi Surfaktan CTAB Sifat magnetik Telah dilakukan proses pembuatan nanopartikel oksida besi denganmetode emulsi. Sebagai surfaktan penstabil emulsi digunakan CTAB (Cethyl Trimethyl Amonium Bromide) bervariasi dari 10 mg hingga 40 mg. Partikel yang terbentuk dipelajari fasanya dengan menganalisis pola difraksi sinar-X menggunakan program RIETAN dan sifatmagnetiknya dengan menganalisis kurva magnetisasi hasil pengukuran VSM (Vibrating Sample Magnetometer). Hasil analisis menunjukkan adanya pembentukan oksida besi dalam fasa Fe3O4 dan γ-Fe2O3 dimana perbandingan fraksi berat keduanya akan dipengaruhi oleh jumlah CTAB yang ditambahkan. Nanopartikel oksida besi optimal diperoleh pada harga CTAB 20 mg dengan nilai magnetisasi mencapai 76 emu/gram dan perbandingan fraksi berat Fe3O4/γ-Fe2O3 sebesar 69,42 %/30,48 %. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5988 10.17146/jsmi.2008.9.3.4706 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 236 - 239 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5988/4400 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5989 2026-10-30T03:41:57Z jsmi:ART

PENGARUH IRADIASI SINAR-γ PADA BAHAN KONDUKTOR IONIK PADAT (CuI)x(Na3PO4)1-x (x = 0,1 dan x = 0,3) P. Purwanto Konduktor ionik padat Iradiasi gamma Difraksi sinar-X Konduktivitas  Pengaruh radiasi sinar-γ terhadap bahan konduktor ionik padat (CuI)x(Na3PO4)1-x telah dipelajari. Bahan konduktor ionik padat (CuI)x(Na3PO4)1-x (x = 0.1 dan x = 0.3) telah dapat dibuat dengan mencampurkan bahan CuI dan Na3PO4 dengan perbandingan fraksi berat tertentu, ditekan pada tekanan 48,26 x 106 N/m2 menjadi pelet dengan diameter 1,5 x 10-2 m. Bahan konduktor ionik padat tersebut di radiasi sinar-γ dengan dosis 5 kGy hingga 30 kGy. Analisis puncak-puncak difraksi sinar-X pada bahan konduktor ionik padat (CuI)x(Na3PO4)1-x menunjukkan struktur CuI dan Na3PO4. Regangan kisi kristal (CuI)x(Na3PO4)1-x stabil terhadap pengaruh dosis radiasi. Pengukuran konduktivitas konduktor padat (CuI)x(Na3PO4)1-x dilakukan dengan alat LCR-meter pada kisaran frekuensi 0,1 Hz hingga 100 kHz. Konduktivitas konduktor ionik padat (CuI)x(Na3PO4)1-x setelah radiasi sinar-γ pada dosis 5 kGy sampai dengan 30 kGy naik sebanding dengan dosis radiasi. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5989 10.17146/jsmi.2008.9.3.4725 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 240 - 244 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5989/4402 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5990 2026-10-30T06:25:06Z jsmi:ART

GROWTH OF CARBON NANOTUBE BYAPPLYING ION IMPLANTATION TECHNIQUE Salim Mustofa Yunasfi Thin Film CNT Ion Implantation Technique Dose GROWTH OF CARBON NANOTUBE BYAPPLYING ION IMPLANTATION TECHNIQUE. The use of ion implantation technique for growing carbon nanotubes (CNT) has been studied. Implantation technique with its high and focused energy is used for implanting Ni+ ion, which can act as catalyst for CNT growth. CNT was grown by implantation of Ar+ and Ni+ ion to the nanostructured carbon thin film that were deposited on Si(100) substrate. The dose of ion implantation parameter was varied between 5 x 1015 to 1 x 1017 ion/cm2. After implantation, the phase identification by X-Ray diffraction (XRD) and observations of surface and cross section morphology of samples by Scanning Electron Microscopy (SEM) in order to investigate the growth of CNT were carried out. The XRD analysis shows the peak of C(002), Ni(010) and Si(100) on the C/Si thin film samples after ion implantation, which indicate the carbon film still in a crystalline structure. The peak of Ni(010) is slightly decreased with the increasing of ion dose. The observation by SEM shows that the greater the dose of implants, the more unflat surface found on a thin film. While from the observation of cross section, it was indicated that the higher dose implants, more clearly the growth of CNTs on the surface of C/Si thin film. CNT is predicted to grow as a result of interaction between ion radiations with carbon, leading to the formation of CNTs. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5990 10.17146/jsmi.2012.13.2.4714 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 108-113 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5990/4406 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5991 2026-10-30T03:41:57Z jsmi:ART

STUDI KEKRISTALAN BARIUM STRONTIUM TITANAT (Ba0,5Sr0,5TiO3) YANG DIDOPING MAGNESIUM DENGAN METODE SPIN COATING N. Sueta Y. Iriani M. Hikam B. Soegijono A. Jamaludin BST Spin coating Analisis Rietveld Doping Lapisan tipis Ba0,5Sr0,5TiO3 (BST) yang didoping Mg telah dibuat dengan metode Chemical Solution Deposition yang disiapkan dengan spin coating. Deposisi lapisan tipis BST pada substrat Si menggunakan spin coater dengan kecepatan putar 3000 rpmselama 30 detik. Suhu annealing yang digunakan pada penelitian ini adalah 800 oC. Karakterisasi, komposisi dan kekristalan lapisan tipis BST dilakukan menggunakan X-Ray Fluorosence (XRF) dan X-Ray Diffraction (XRD). Hasil XRF menunjukkan bahwa unsur-unsur pembentuk BST dan doping Mg telah terdeposit pada substrat Si. Hasil analisis Rietveld pada pola difraksi sinar X menunjukkan bahwa doping Mg mempengaruhi struktur kristal dan parameter kisi. Parameter kisi untuk BST murni dan BST yang didoping Mg 1% sama dengan data PDF-ICDD yaitu 3,947 Å. Sedangkan untuk BST yang didoping Mg 2 % dan 4 % sebesar 3,948 Å BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5991 10.17146/jsmi.2008.9.3.4726 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 245 - 248 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5991/4404 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5992 2026-11-02T03:55:11Z jsmi:ART

KETAHANAN OKSIDASI BAJA SUPER AUSTENITIK 15%CR-25%NI PADA TEMPERATUR 850°C Parikin B. Sugeng M. Dani S. G. Sukaryo Baja Austenitik 15%Cr-25%Ni Austenite Steel 15%Cr-25%Ni Oksidasi Oxidation Strukturmikro Microtructure Perlakuan Suhu Temperature Treatments OXIDATION RESISTANCE OF SUPER AUSTENITE 15%Cr-25%Ni STEEL AT TEMPERATURE 850°C. High temperature corrosion resistance so called oxidation resistance is an important prerequisite of a metal material that may be applied in a high-temperature operating environment. An oxidation test of super austenite steel 15% Cr-25% Ni at 850°C for more than 5 hours has been performed. One as-cast specimen as an initial reference is not treated any heat and two (2) specimen groups (each of 4 pieces) were prepared in the experiments. One group of as-cast specimens after being heated at 850°C for more than 5 hours and cooled slowly then weighed. Another group of quench specimens performed a rapid decrease of temperature (850°C for more than 5 hours) into water, then weighed. The experiment was conducted for more than 15 hours in each group. The results show that there is a very small slight increase in weight on as-cast and quench specimens. However, electron microscope morphology (SEM) images on both specimens showed no significant changes. Similarly, the results of phase analysis using X-ray diffraction techniques also do not show the phase growth of oxidation products. In accordance with the observation of surface microstructures of materials by using optical microscope (OM), also did not show damage and changes in grain size by oxidation process. The likelihood of this phenomenon is that in addition to the formation of Ni element of spinels, it is also strengthened by the ability of Cr-elements to form a passive layer (Cr2O3) on a very large material surface by binding O-elements, so that the material can cope with very small oxidation products. It is concluded that the super austenitic steels has good oxidation resistance at 850°C. ABSTRAK KETAHANAN OKSIDASI BAJA SUPER AUSTENITIK 15%Cr-25%Ni PADA SUHU 850°C. Ketahanan korosi suhu tinggi atau ketahanan oksidasi merupakan prasyarat penting bahan logam yang akan diterapkan dilingkungan operasi bersuhu tinggi. Pengujian ketahanan oksidasi baja super austenitik 15%Cr-25%Ni pada suhu 850°C selama 5 jam lebih telah dilaksanakan. Satu sampel as-cast sebagai acuan awal yang tidak diperlakukan panas dan dua (2) kelompok sampel (masing-masing 3 buah) disiapkan dalam eksperimen. Satu kelompok sampel as-cast setelah dipanaskan (pada 850°C/5 jam lebih) dan didinginkan perlahan kemudian ditimbang. Satu kelompok sampel quench yang dilakukan penurunan cepat suhu (dari 850°C/5 jam lebih) ke dalam air, kemudian ditimbang. Percobaan dilakukan selama 15 jam lebih pada masing-masing kelompok. Hasil memperlihatkan bahwa walaupun terjadi kenaikan berat sangat kecil pada sampel as-cast dan quench, tetapi foto morfologi mikroskop elektron (SEM) pada kedua sampel tersebut tidak memperlihatkan perubahan yang signifikan. Demikian pula hasil analisis fasa menggunakan difraksi sinar-X, tidak memperlihatkan pertumbuhan fasa produk oksidasi. Hasil pengamatan struktur mikro permukaan bahan menggunakan mikroskop optik (MO), juga tidak memperlihatkan kerusakan dan perubahan ukuran butir oleh proses oksidasi. Kebolehjadian pada fenomena ini adalah selain pembentukan spinel unsur Ni diperkuat juga oleh kemampuan unsur Cr untuk membentuk lapisan pasif (Cr2O3) dipermukaan bahan yang sangat besar dengan mengikat unsur O, sehingga bahan mampu menanggulangi produk oksidasi yang sangat kecil. Disimpulkan bahwa baja super austenitik memiliki ketahanan oksidasi yang baik pada suhu 850°C. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5992 10.17146/jsmi.2017.18.4.4128 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 179-184 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5992/4410 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5993 2026-10-30T03:41:57Z jsmi:ART

PEMILIHAN BAHAN PEMEGANG KAWAT NIKELIN UNTUK SISTEM PEMANAS Eddy Santoso Safei Purnama Pemegang kawat nikelin Sistem pemanas Metode cor Pengukuran konduktivitas ionik bahan sebagai fungsi suhu dapat dilaksanakan apabila tersedia sebuah pemanas yang dibuat khusus sesuai dengan kebutuhan. Untukmenunjang penelitian tersebut dilakukan percobaan untuk mendapatkan bahan untuk pemegang elemen pemanas yang tahan suhu tinggi, mudah didapat di pasaran lokal dan diproses dengan metode cor. Pada penelitian ini telah dicoba beberapa bahan untuk pemegang elemen pemanas yaitu tanah liat, kompon gibsum, semen putih dan semen abu-abu. Hasil uji menunjukkan bahwa bahan yang baik untuk pemegang elemen pemanas kawat nikelin adalah semen abu-abu. Sistem pemanas yang dikontrol dengan suhu kontrol TZ4M-14S, telah diuji dari suhu kamar sampai 450 °C dengan ketelitian ± 0,5 °C dan sistem pemanas dapat digunakan sampai suhu maksimum 700 °C. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5993 10.17146/jsmi.2008.9.3.4727 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 249 - 253 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5993/4405 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5994 2026-10-30T03:41:57Z jsmi:ART

PENGARUH ADITIF MgO DAN PERLAKUAN PANAS TERHADAP MATERIAL ELEKTRO KERAMIK BERBASIS BETA ALUMINA (β”-ALUMINA). Ramlan Akmal Johan Arsali Bambang Soegijono Alumina Match GSAS Fraksi berat Parameter kisi Strukturmikro Telah dilakukan pembuatan β”-Alumina menggunakan metode metalurgi serbuk dengan paduan komposisi α-Alumina 83 %, Na2O 10 % dan variasi MgO masing-masing 5,5 %; 6,7%; 7,9 %; 8,9%dan 10%. Proses pencampuran dilakukan dengan menggerus selama 4 jam. Kemudian bahan paduan di bentuk pelet menggunakan hydroulic press dengan tekanan 3 ton. Sampel disinter pada suhu 1500 oC selama 5 jam. Untuk 7,9 % bahan diberikan perlakuan panas untuk 3 kali perlakuan panas pada suhu yang berbeda yaitu pada 1300 oC, 1400 oC dan 1500 oC. Karakterisasi meliputi analisis fasa dengan XRD, identifikasi fasa menggunakan perangkat lunak Match dan GSAS serta analisis struktur mikro dengan SEM. Hasil dari analisis fasa memperlihatkan telah terbentuknya β”-Alumina dan masih adanya β-Alumina pada semua variasi MgO yang digunakan. Dengan kata lain fasa β”-Alumina tidak terbentuk 100%. Variasi MgO juga memberikan densitas yang relatif tinggi begitu juga dengan fraksi berat. Pembentukan fasa β”-Alumina tidak mencapai 100 %, tetapi dengan penambahan MgO maka dapat diperoleh fasa stabil. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5994 10.17146/jsmi.2008.9.3.4728 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 254 - 259 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5994/4407 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5995 2026-10-30T03:41:57Z jsmi:ART

PENGARUH IRADIASI GAMMA PADA BAHAN KOMPOSIT AgI0,5 (β-Al2O3)0,5 Safei Purnama P. Purwanto komposit AgI0,5(β-Al2O3)0,5 Difraksi sinar-X Konduktivitas ionik Iradiasi gamma Bahan komposit (AgI)0,5 (β-Al2O3)0,5 telah dibuat dengan reaksi padatan yaitu pencampuran antara AgI dengan Al2O3. Bahan elektrolit padat di pelet dengan ukuran diameter 1,5 cm dan tekanan 5 ton. Kemudian bahan komposit (AgI)0,5 (β-Al2O3)0,5 tersebut dilakukan iradiasi sinar-γ dengan dosis 10 kGy dan 50 kGy. Setelah iradiasi, dilakukan pengukuran struktur kristal dengan teknik difraksi sinar-X, konduktivitas ionik dengan alat LCR-meter pada kisaran frekuensi 0,1 Hz hingga 100 kHz, dan diukur kekerasannya dengan alat Vickers. Pola difraksi sinar-X pada bahan komposit AgI0,5 (β-Al2O3)0,5 menunjukkan bahwa struktur campuran yang terbentuk memiliki struktur FCC dan sama dengan fasa γ-AgI, dengan parameter kisi sekitar 6,52 Å. Nilai konduktivitas bahan campuran (AgI)0,5 (β-Al2O3)0,5 sebelum iradiasi berkisar antara 0,11 x 10-5 S/cm hingga 0,13 x 10-5 S/cm, sedangkan sesudah iradiasi adalah sekitar 0,31 x 10-6S/cmhingga 0,61 x 10-6S/cm. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article https://ejournal.brin.go.id/jsmi/article/view/5995 10.17146/jsmi.2008.9.3.4729 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 260 - 266 2614-087X 1411-1098 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5996 2026-10-30T06:25:06Z jsmi:ART

MONITORING KESTABILAN DISPERSI MULTI WALL CARBON NANOTUBE DALAM SURFAKTAN HEXADECYLTRIMETHYL AMMONIUM BROMIDE Holia Onggo Djulia Onggo R.Yudianti Dispersi Sonikasi Multi Wall Carbon Nano Tube Hexadecyltrimethyl ammonium bromide UV spektrofotometer MONITORING KESTABILAN DISPERSI MULTI WALL CARBON NANOTUBE DALAM SURFAKTAN HEXADECYLTRIMETHYL AMMONIUM BROMIDE. Kestabilan dispersi Multi Wall Carbon Cano Tube (MWCNT) dalam larutan yang mengandung Hexadecyl trimethyl Ammonium Bromide (CTAB) diamati dengan UV spektrofotometer. Dispersi MWCNT dalam larutan CTAB dengan rasio massa 1: 2 dibuat dengan bantuan ultrasonic vibracell pada amplitude 60% dengan variasi waktu sonikasi 60menit, 90menit dan 120 menit. Pengaruh waktu sonikasi dan waktu penyimpanan terhadap kestabilan dispersi diamati dengan mengukur absorbansi dispersi dengan UV spektrofotometer. Perubahan morfologi MWCNT akibat gelombang ultrasonik yang ditimbulkan oleh ultrasonic vibracell diamati dengan Scanning/ Transmission Electron Microscope (S/TEM). Meningkatnya waktu sonikasi menyebabkan laju dispersi MWCNT meningkat ditunjukan dengan berkurangnya diameter dan panjang MWCNT. Penambahan surfaktan CTAB yang berlebihan dalam larutan menyebabkan proses sonikasi menjadi tidak efektif. Kestabilan dispersi MWCNT dapat bertahan selama 20 hari. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5996 10.17146/jsmi.2012.13.2.4715 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 114-119 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5996/4411 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5997 2026-10-30T03:41:57Z jsmi:ART

PEMBUATAN KOMPOSIT SEKAM PADI-LATEKS DENGAN BAHAN PENGISI SEMEN DAN ABU TERBANG Marsongko Sugiarto Danu Made Sumarti K Komposit Sekam padi Lateks iradiasi Semen Telah dilakukan penelitian pembuatan komposit sekam padi dan limbah lateks dari proses pemekatan lateks dengan lateks iradiasi sebagai perekat. Secara garis besar proses pembuatan komposit sekam padi-lateks dilakukan dengan mencampurkan sekampadi yang telah kering dengan ukuran lebih kecil yaitu 40 sampai dengan 80 mesh dengan tepung slugde (limbah lateks), abu terbang, lateks iradiasi, dan semen sehingga menjadi adonan. Masing-masing adonan dengan komposisi yang berbeda yaitu konsentrasi semen adalah 0%, 6%, 8%, 10%, 12%, lateks iradiasi dan abu terbang masing-masing adalah 15%dan 10%dari berat campuran. Adonan kemudian dimasukkan ke dalam cetakan, dan ditekan dengan mesin pres pada suhu 160 ºC, tekanan 60 kg/cm2 selama 15 menit. Sifat fisik dan mekanik komposit yang diukur meliputi kadar air, kerapatan, pengembangan tebal, kuat lentur (MOR), modulus elastisitas (MOE), kuat ikat internal (IB), dan kuat pegang sekrup (SW). Kadar air, kerapatan dan pengembangan tebal masing-masing 4,05% hingga 5,02%, 0,95 g/cm3 hingga 0,97 g/cm3 dan 6,50 % hingga 9,06 % (perendaman dalam air selama 2 jam), 9,32 % hingga 12,44 % (perendaman dalam air selama 24 jam). Standar Nasional Indonesia (SNI) mensyaratkan kadar air papan partikel maksimum 14 %, kerapatan 0,50 g/cm3 hingga 0,70 g/cm3, dan untuk pengembangan tebal pada perendaman dalam air 10 % hingga 20 %. Nilai kuat lentur 292,92 kg/cm2 hingga 349,54 kg/cm2 (SNI = minimum 100 kg/cm2), modulus elastisitas 14,819 kg/cm2 hingga 20,238 kg/cm2, IB = 4,88 kg/cm2 hingga 25,87 kg/cm2, SW= 70 kg hingga 88 kg. SW telah memenuhi standar SNI yaitu minimal 40 kg. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5997 10.17146/jsmi.2008.9.3.4730 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 267 - 271 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5997/4408 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/5998 2026-10-30T03:41:57Z jsmi:ART

KARAKTERISASI BAHAN PADUAN Al-Si HASIL PROSES SQUEEZE CASTING Supandi Suminta B.Bandriyana Paduan Al-Si Karakterisasi Cor perah Proses cor perah (squeeze casting) dilakukan untuk meningkatkan kualitas bahan paduan Al-Si yang banyak digunakan untuk komponen otomotif. Bahan paduan Al-Si dari suatu piston diambil sebagai sampel dan dilakukan daur ulang dengan proses cor perah dengan variasi tekanan 200 kgf/cm2, 300 kgf/cm2 dan 400 kgf/cm2. Karakteristik bahan sebelum proses dibandingkan dengan hasil karakterisasi bahan hasil perlakuan cor perah untuk evaluasi perubahan sifat mekanik dan strukturmikro. Karakterisasi bahan dilakukan dengan pengujian komposisi, uji kekerasan, porositas, strukturmikro dan uji struktur kristal. Hasil pengujian menunjukkan terjadinya kenaikan kekerasan akibat perlakuan cor perah dari 40 HRA sebelum proses menjadi 46 HRA setelah proses dengan tekanan 300 kgf/cm2. Kenaikan kekerasan disertai dengan penurunan porositas dari 5% menjadi 0,3% dengan perubahan butir dalam strukturmikro yang semakin halus. Hasil pengujian struktur kristal untuk sampel sebelum dan sesudah perlakuan cor perah menunjukkan struktur kristal kubus pusat bidang dan tidak terjadi perubahan fasa. BRIN Publishing (Penerbit BRIN) 2008-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5998 10.17146/jsmi.2008.9.3.4731 Jurnal Sains Materi Indonesia; Vol. 9 No. 3 (2008): Jurnal Sains dan Materi Indonesia; 272 - 277 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/5998/4409 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6000 2026-11-02T03:55:11Z jsmi:ART

MAGNETIC REDUCED GRAPHENE OXIDE AS ADVANCED MATERIALS FOR ADSORPTION OF METAL IONS Andri Hardiansyah Elsy Rahimi Chaldun Amelia Fadyah Idzni Graphene Oxide (GO) Magnetic Nanoparticles Nanopartikel Magnetik Adsorption Adsorpsi MAGNETIC REDUCED GRAPHENE OXIDEAS ADVANCED MATERIALS FORADSORPTION OF METAL IONS. Magnetic Reduced Graphene Oxide (MRGO) is graphene-based material that modified by introducing iron oxide nanoparticles onto the surface of graphene oxide (GO). MRGO exhibit some unique and advanced properties and characteristic including high surface area, superparamagnetic characteristics and adsorption ability against ions and molecules. In this research, MRGO was prepared by the Hummers method, followed by reacting ferrochloride tetrahydrate and ferrichloride hexahydrate through co-precipitation method for the formation of iron oxide nanoparticles on the GO surface. MRGO was prepared with various composition of ferrochloride tetrahydrate. Furthermore, the resultant of MRGO was characterized by Scanning Electron Microscope (SEM), Fourier-transform Infrared (FT-IR) Spectroscopy, and Atomic Adsorption Spectroscopy (AAS). Adsorption characteristics test was conducted against electroplating waste-based metal ion. The SEM results showed that GO exhibited the layered structure meanwhile MRGO exhibit as Feƒ O4 -modified GO layered surfaces. MRGO made by different ferrochloride tetrahydrate differed in the iron oxide nanoparticles formation on the surface of GO. Increasing the composition of ferrochloride tetrahydrate increased the formation of iron oxide nanoparticles. Moreover, MRGO (FeCl‚ .4H‚ O 0.0064 M) is successfully applied as nickel metal ion adsorbents with the adsorption ability of 78,24%. This result showed that MRGO have a potential prospect as an effective and efficient advanced adsorbent material candidate ABSTRAK MAGNETIC REDUCED GRAPHENE OXIDE SEBAGAI MATERIAL MUTAKHIR UNTUK PENYERAPAN ION LOGAM. Magnetic Reduced Graphene Oxide (MRGO) merupakan material berbasis graphene yang dimodifikasi dengan adanya nanopartikel besi oksida pada permukaan Graphene Oxide (GO). MRGO menampilkan sifat dan karakter yang unik dan mutakhir seperti luas permukaan yang tinggi, karakter superparamagnetik serta kemampuan penyerapan terhadap ion dan molekul. Pada penelitian ini, MRGO dipreparasi dengan menggunakan metode Hummer yang diikuti dengan mereaksikan ferrochloride tetrahydrate dan ferrichloride hexahydrate melalui metode kopresipitasi untuk membentuk nanopartikel besi oksida pada permukaan GO. MRGO dipreparasi dengan memvariasikan konsentrasi prekursor ferrochloride tetrahydrate. Selanjutnya, MRGO yang dihasilkan dikarakterisasi dengan menggunakan Scanning Electron Microscope (SEM), Fourier-Transform Infrared (FT-IR) Spectroscopy, dan Atomic Adsorption Spectroscopy (AAS). Karakter adsorpsi diuji dengan menggunakan ion logam nikel. Hasil observasi SEM menunjukkan bahwa GO menampilkan struktur lapisan sedangkan pada MRGO menampilkan adanya nanopartikel besi oksida pada lapisan permukaan GO. MRGO menampilkan sebaran nanopartikel besi oksida yang berbeda pada konsentrasi yang berbeda. Peningkatan konsentrasi awal prekursor ferrochloride tetrahydrate akan meningkatkan pembentukan nanopartikel besi oksida pada GO. MRGO (FeCl2.4H2 O 0,0064 M) dapat diaplikasikan pada ion nikel sebagai adsorben dengan kemampuan absorspi sebesar 78,24%. Hasil ini menunjukan bahwa MRGO memiliki prospek yang potensial sebagai kandidat material untuk adsorben ion logam yang efektif dan efisien. BRIN Publishing (Penerbit BRIN) 2017-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6000 10.17146/jsmi.2017.18.4.4119 Jurnal Sains Materi Indonesia; Vol. 18 No. 4 (2017): Jurnal Sains dan Materi Indonesia; 185-189 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6000/4412 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6001 2026-10-30T06:25:06Z jsmi:ART

STRUKTUR MIKRO BAHAN PIEZOELEKTRIK BEBAS TIMBAL TITANAT-BARIUM TITANAT KALIUM NATRIUM NIOBATE HASIL SINTESIS DENGAN METODE REAKSI PADAT Mardiyanto Syahfandi Ahda Piezoelektrik bebas timbal BNT BT KNN STRUKTUR MIKRO BAHAN PIEZOELEKTRIK BEBAS TIMBAL TITANAT-BARIUM TITANAT KALIUM NATRIUM NIOBATE HASIL SINTESIS DENGAN METODE REAKSI PADAT. Telah dilakukan sintesis bahan keramik piezoelektrik Timbal Titanat-Barium Titanat-Kalium Natrium Niobate (BNT-BT-KNN )ramah lingkungan yakni bahan yang tidak mengandung unsur timbal dan merupakan bahan campuran antara bahan keramik Bismuth Natrium Titanat (BNT), Barium Titanat (BT) dan Kalium Natrium Niobate (KNN). Pada penelitian ini telah dilakukan sintesis BNT-BT-KNN dengan metode reaksi padat. Setelah proses sintesis strukturmikro bahan dikarakterisasi menggunakan X-Ray Diffractometer (XRD) dan Scanning Electron Mocroscope (SEM). Bahan BNT-BT-KNN yang disintesis memiliki rumus kimia (0,94-y)BNT-0,06BT-y KNN dengan harga y divariasikan dalam persentase mol sebesar 3 %, 6 % dan 8 %. Bahan campuran dipelet dengan tekanan sebesar 3500 psi dan di sinter pada suhu 1000 oC selama 4 jam. Bentuk pola difraksi BNT-BT-KNN yang terbentuk sama dengan bentuk pola difraksi yang di lakukan oleh peneliti sebelumnya. Dari pola difraksi bahan BNT-BT-KNN yang terbentuk mempunyai struktur kristal tetragonal dan terjadi pergeseran puncak sehingga mengidentifikasikan bahwa terjadi perubahan struktur tetragonal ke struktur rombohedral. Dari hasil SEM terlihat bahwa dengan kenaikan penambahan KNN terlihat bahan semakin berongga dengan ukuran yang semakin kecil dan lebih merata. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6001 10.17146/jsmi.2012.13.2.4716 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 120-124 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6001/4413 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6002 2026-11-02T03:49:24Z jsmi:ART

EFEK ADITIF FeMo DAN PROSES KALSINASI PADA SERBUK MAGNETIK BaFe12O19 Ayu Yuswita Sari Cut Hani Safira Eko Arief Setiadi Siviana Simbolon Candra Kurniawan Perdamean Sebayang FeMo Mechanical Alloying Kalsinasi Vibrating Sample Magnetometer BaFe12O19 Calcination EFFECT OF FeMo ADDITIVE AND CALCINATION PROCESS ON MAGNETIC POWDERS BaFe12O19. In this study, we have been investigated the effect of FeMo additive and calcination process in magnet permanent barium hexaferrite. The permanent magnet of barium hexaferrite was prepared by mechanical alloying method. The mixing powder of BaFe12O19 and FeMo was calcinated on 1000 and 1200°C prepared of temperature. The characterization was done for physical and magnetic properties with X-ray Powder Diffraction (XRD) and piknometer for the phase of material and the powder density and then Vibrating Sample Magnetometer (VSM) for the magnetic properties of barium hexaferrite magnet. The experiment result showed analysis that addition of FeMo increased the powder density of barium hexaferrite. The magnetic properties result showed that increasing of FeMo additive make deacreassing of magnetic characterization. While the more addition of FeMo can be increases remanence, saturation, and BHmax Even though deacreases the coercivity. The increasing of calcination temperature can increases remanence and BHmax but deacreases saturation and coercivity. It means the process can changes the magnet structure from hard to soft magnetic material. The optimum value, when the barium hexaferrite add %wt 5 FeMo additive with 3.71 g/cm3powder density before calcination process. And the magnetic properties such as: saturation 2.12 kG, remanence1,15 kG, coercivity 0,45 kOe dan BHmax 0,145 MGOe after calcination process at 1000°C. ABSTRAK EFEK ADITIF FeMo DAN PROSES KALSINASI PADA SERBUK MAGNETIK BaFe12O19. Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembuatan magnet permanen barium heksaferit (BaFe12O19). Proses pembuatan magnet barium heksaferit dilakukan dengan metode mechanical alloying. Serbuk hasil mixing antara BaFe12O19 dan FeMo dikalsinasi dengan variasi suhu kalsinasi 1000°C dan 1200°C. Karakterisasi yang dilakukan meliputi sifat fisis dan magnetik, dengan menggunakan X-Ray Diffraction (XRD) dan piknometer untuk mengetahui fasa dan nilai densitas magnet, serta menggunakan Vibrating Sample Magnetometer (VSM) pada pengukuran sifat magnetik magnet barium heksaferit. Dari hasil eksperimen, dapat diketahui bahwa penambahan aditif FeMo dapat menaikkan nilai densitas pada serbuk barium heksaferit. Hasil analisis sifat magnetik, dapat diketahui bahwa penambahan aditif FeMo secara keseluruhan menurunkan sifat magnetik magnet. Namun penambahan %wt FeMo menaikkan nilai remanensi, saturasi dan energi produk maksimum (BHmax) magnet barium heksaferit, meskipun nilai koersivitas magnet tetap menurun. Sedangkan, kenaikan suhu kalsinasi mampu menaikkan nilai remanensi, dan BHmax, namun menurunkan nilai koersivitas dan saturasi dari magnet barium heksaferit. Hal ini menunjukkan penambahan zat aditif FeMo mampu mengubah struktur material magnet permanen barium heksaferit dari hard magnetic menjadi soft magnetic material. Nilai optimum dihasilkan pada komposisi penambahan 5%wt aditif FeMo dengan nilai densitas serbuk 3,71 g/cm3 sebelum dikalsinasi, dan memiliki sifat magnetik seperti : saturasi 2,12 kG, remanensi 1,15 kG, koersivitas 0,45 kOe dan BHmax 0,145 MGOe setelah dikalsinasi pada suhu 1000°C BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6002 10.17146/jsmi.2017.18.3.4112 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 95-100 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6002/4414 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6003 2026-10-30T06:25:06Z jsmi:ART

ANALISIS KINETIKA REAKSI PEMBENTUKAN LiFePO4 DENGAN MENGGUNAKAN METODE KISSINGER Indra Gunawan Kinetika reaksi Metode Kissinger DTA LiFePO4 ANALISIS KINETIKA REAKSI PEMBENTUKAN LiFePO4 DENGAN MENGGUNAKAN METODE KISSINGER. Telah dilakukan analisis kinetika reaksi pembentukan LiFePO4 dengan menggunakan metode Kissinger. Sintesis LiFePO4 dilakukan dengan mencampur LiCl, FeCl2.4H2O dan H3PO4 ekuimolar dengan pelarut air. Homogenasi larutan dilakukan dengan pengaduk magnet pada suhu 60 ºC. Prekursor LiFePO4 diperoleh setelah dilakukan pemanasan pada suhu 200 ºC selama 2 jam untuk menghilangkan pelarut. Prekursor LiFePO4 dianalisis dengan Differential Thermal Analysis (DTA) pada beberapa kecepatan pemanasan yaitu 5 ºC menit-1, 10 ºC menit-1, 15 ºC menit-1dan 20 ºC menit-1. Prekursor juga dipanaskan pada suhu 700 ºC selama 4 jam di dalam furnace untuk dikonfirmasi kemurnian fasa dan struktur kristalnya dengan menggunakan X-Ray Diffactometer (XRD) dan pengamatan morfologinya dengan menggunakan Scanning Electron Microscope (SEM). Dengan menggunakan metode Kissinger, energi aktivasi reaksi pembentukan LiFePO4 telah dapat ditentukan sebesar Ea = 412 kJmol-1 dan frekuensi tumbukan A=1,1705 x 103. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6003 10.17146/jsmi.2012.13.2.4717 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 125-129 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6003/4417 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6004 2026-11-02T03:49:24Z jsmi:ART

SINTESIS SELULOSA-g-ASAM AKRILAT-STIREN SEBAGAI ADSORBEN ION LOGAM Meri Suhartini Nunung Nuryanthi Selulosa Cellulose Asam Akrilat Stirena Styrene Acrylic Acid Irradiasi Gamma Gamma Irradiation Kobalt-60 Cobalt-60 SYNTHESIS OF CELLULOSE-g-ACRYLIC ACID-STYRENE AS METAL ION ADSORBENT. Acrylic acid and styrene were grafted onto cellulose by using gamma rays from cobalt-60 as the initiator. The research aims to improve the physical and chemical properties of grafted copolymer of cellulose-acrylic acid (Cell-g-AA) as Pb2+ metal ion adsorbent. The results showed that the optimum irradiation dose for the grafting of acrylic acid and styrene on the cellulose was achieved at 30 kGy. An improvement of the degree of swelling (%S) of Cell-g-AA from 470% to 89% at simultaneously grafting with irradiation dose of 30 kGy. Characterization of functional groups using Fourier Transform InfraRed Spectroscopy (FT-IR) showed the presence of new spectrum at Cell-g-AA-St. Morphological analysis using Scanning Electron Microscope (SEM) showed that the size of the fiber Cell-g-AA-St was 67% higher than that before the grafting. The results using Energy Dispersive X-Ray Analysis (EDX) showed that metal ions Pb2+, Mn2+dan Ni2+ can be adsorped by the Cell-g AA-St copolymer. The adsorption capability of the copolymer is best on Pb2+, then Ni2+ and the lowest on Mn2+. ABSTRAK SINTESIS SELULOSA-g-ASAM AKRILAT-STIREN SEBAGAI ADSORBEN ION LOGAM. Asam akrilat dan stiren dicangkokkan pada selulosa (Sel-g-AA-St ) dengan menggunakan inisiator sinar gamma dari sumber radiasi kobalt-60. Penelitian bertujuan memperbaiki sifat fisik kimia kopolimer cangkok selulosaasam akrilat (Sel-g-AA) sebagai adsorben ion logam. Hasil menunjukkan bahwa dosis iradiasi optimum untuk proses pencangkokan asam akrilat dan stiren pada selulosa dicapai pada 30 kGy. Pada pencangkokan secarasimultan dengan dosis iradiasi 30 kGy, dengan adanya penambahan stiren, terjadi perbaikan derajat pengembangan (%S), %S kopolimer Sel-g-AA yang semula 470% turun menjadi 89%. Pencirian gugus fungsi menggunakan Fourier Transform InfraRed Spectroscopy (FT-IR) menunjukan adanya spektrum baru pada Sel-g-AA-St. Analisis morfologi menggunakan Scanning Electron Microscope (SEM) menunjukan bahwa ukuran serat Sel-g-AA-St menjadi lebih besar 67% dibandingkan selulosa sebelum dimodifikasi. Hasil analisis menggunakan Energy Dispersive Analysis X-Ray (EDX) memperlihatkan bahwa ion logam Pb2+, Mn2+dan Ni2+ dapat terserap oleh kopolimer Sel-g-AA-St. Kemampuan adsorpsi kopolimer tersebut terbaik pada Pb2+, kemudian Ni2+ dan yang terendah pada Mn2+.   BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6004 10.17146/jsmi.2017.18.3.4113 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 101-108 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6004/4418 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6005 2026-11-02T04:37:07Z jsmi:ART

THE EFFECT OF PRETREATMENT OF MICROWAVE HEATING ON EFFICIENCY OF HYDROLYSIS TIME AND α-CELLULOSIC CHARACTERISTICS OF PALM OIL WASTE BIOMASS Fitriani Kasim Khaswar Syamsu Dwi Setyaningsih Prayoga Suryadarma Sudirman Microwave Preliminary treatment/pretreatment Hydrolysis α-Cellulose, OPEFB Mesocarp THE EFFECT OF PRETREATMENT OF MICROWAVE HEATING ON EFFICIENCY OF HYDROLYSIS TIME AND α-CELLULOSIC CHARACTERISTICS OF PALM OIL WASTE BIOMASS. This research is underlied by the needs of various industries for alpha cellulose, especially for the needs of raw material for cellulose nanocristalline, from fiber derived from the most potential waste biomass in Indonesia, namely oil palm empty fruit bunches (OPEFB) and mesocarp fibers. This study aims to find out the effect of pretreatment by microwave heating on the efficiency of hydrolysis time and alpha cellulose characteristics from palm oil waste biomass. To produce alpha cellulose, acid hydrolysis is commonly used with the multistage pulping process method, where the fiber is dissolved into HNO3 mixed acid, 3.5% and NaNO2, heated at a temperature of 90 oC for 2 hours, hydrolyzed and delignified to remove lignin and bleached, then separated from betha and gamma cellulose by dissolving it with NaOH 17.5%. In this study, a preliminary treatment (pretreatment) with microwave heating was carried out before the fiber was hydrolyzed so that the hydrolysis process was more efficient without reducing the characteristics of the alpha cellulose produced. The research results showed that pretreatment with microwave heating can streamline the hydrolysis time from 2 hours to 1 hour, without reducing its characteristics, where the degree of fiber crystallinity (XRD) and the yield of alpha cellulose remain high. Microwave heating with 450 watts for 5 minutes (treatment A) is better than 300 watts of heating for 10 minutes (treatment B). From the results of the study, it can be concluded that the pretreatment with microwave heating can streamline the hydrolysis time of the fiber to obtain alpha cellulose and increase the yield of the produced alpha cellulose. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6005 10.17146/jsmi.2018.20.1.5408 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 21-28 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6005/4416 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6007 2026-10-30T06:25:06Z jsmi:ART

QUANTITATIVE PHASE ANALYSIS OF THE ZrNbMoGe ALLOYS USING NEUTRON DIFFRACTION TECHNIQUES Parikin A. Fajar A. Insani A. H. Ismoyo B. Bandriyana ZrNbMoGe alloys Rietveld method Neutron diffraction QUANTITATIVE PHASE ANALYSIS OF THE ZrNbMoGe ALLOYS USING NEUTRON DIFFRACTION TECHNIQUES. Quantitative analysis by neutron diffraction technique can be utilized to measure not only the type of compounds but also the amount of compounds present in a solid or powder system. The technique has been proven for a composition analysis due to offering some advantages particularly for elements with very similar atomic numbers, and for their high penetrating power. A quantitative phase analysis experiment by using neutron diffraction has recently been carried out to determine the amount present of phases in ZrNbMoGe system. The data analysis was obtained by Rietveld refinement method. The result shows that the profiles have a very good fitting (Rwp = 12.62 %, 15.45 % and 16.39 %) with the number of reliable factor among 1.0 and 2.0. The phases of Zr, ZrMo2 , Zr3Ge and ZrGe are identified in the specimens. The ZG1 specimen contains of 94.19 %wt of Zr phase, 2.05 %wt of ZrMo2 phase, 3.15 %wt of Zr3Ge and 0.59 %wt of ZrGe phase. Whereas the ZG2 specimen comprises of: 84.45 %wt of Zr phase, 4.16 %wt of ZrMo2 phase, 10.18 %wt of Zr3Ge and 1.20 %wt of ZrGe phase. The volume fraction of the minor phases on specimens shows an increase as addition in Ge content. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6007 10.17146/jsmi.2012.13.2.4718 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 130-135 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6007/4419 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6008 2026-11-02T03:49:24Z jsmi:ART

MICROSTRUCTURE AND PHASE TRANSFORMATION OF PURE TITANIUM DURING NITRIDING PROCESS BY HIGH DENSITY PLASMA J. M. Windajanti D. J. D. H. Santjojo Abdurrouf Pure Titanium Titanium Murni RF-DC Sistem Plasma Plasma System Low Temperature Nitriding Nitriding Pada Suhu Rendah Omega Titanium Increasing Surface Hardness Peningkatan Kekerasan permukaan MICROSTRUCTURE AND PHASE TRANSFORMATION OF PURE TITANIUM DURING NITRIDING PROCESS BY HIGH DENSITY PLASMA. Low temperature nitriding process at a temperature of 450°C has been carried out in order to increase the surface hardness of pure titanium. The plasma nitriding process was utilized by high density RF-DC system with an addition of a hollow cathode device. The plasma was generated by RF generator with the frequency of 2 MHz and attract directly to the cathode plate by high voltage DC bias of -500 to -600 V. The plasma of N2/H2 gases with a flow rate of 160/40 mL/min in gas pressure of 75, 50, and 30 Pa was used in nitriding process for 4h and 8h. The occurrence of phase transformation of -Ti to w-Ti triggers the formation of TiN as a nitride layer. The formation of TiN and the diffusion of nitrogen into a titanium matrix can increase the surface hardness of pure titanium up to 792.0 HV. ABSTRAK STRUKTURMIKRO DAN TRASFORMASI FASATITANIUM SELAMA PROSES NITRIDASI DENGAN HIGH DENSITY PLASMA. Proses nitriding pada suhu 450°C berhasil dilakukan untuk meningkatkan tingkat kekerasan logam titamium murni. Proses nitriding menggunakan plasma berdensitas tinggi yang dihasilkan oleh sistem RF-DC dengan penambahan perangkat hollow cathode. Plasma dibangkitkan oleh RF generator yang berfrekuensi 2 MHz dan ditarik menuju plat katoda oleh tegangan tinggi suatu bias DC sebesar -500 V atau -600 V. Plasma yang terbentuk dari campuran gas nitrogen dan gas hidrogen dengan laju aliran sebesar 160/40 mL/menit pada tekanan gas sebesar 75, 50, dan 30 Pa digunakan pada proses nitriding selama 4 jam atau 8 jam. Hasil yang didapat adalah terjadinya perubahan fase dari α-Ti menjadi ω-Ti yang sekaligus menjadi pemicu terbentuknya TiN sebagai lapisan nitride. Pembentukan TiN dan terjadinya difusi dari atom nitrogen ke dalam matriks logam titanium berhasil meningkatkan kekerasan permukaan logam titanium hingga mencapai nilai 792,0 HV. BRIN Publishing (Penerbit BRIN) 2017-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6008 10.17146/jsmi.2017.18.3.4115 Jurnal Sains Materi Indonesia; Vol. 18 No. 3 (2017): Jurnal Sains dan Materi Indonesia; 116-122 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6008/4420 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6009 2026-10-30T06:25:06Z jsmi:ART

SINTESIS DAN KARAKTERISASI NANOPARTIKEL Fe3O4 MAGNETIK UNTUK ADSORPSI KROMIUM HEKSAVALEN Sari Hasnah Dewi Ridwan Adsorpsi Fe3O4 Kromium (VI) Langmuir SINTESIS DAN KARAKTERISASI NANOPARTIKEL Fe3O4 MAGNETIK UNTUK ADSORPSI KROMIUM HEKSAVALEN. Telah dilakukan sintesis nano partikel Fe3O4 dengan menggunakan metode presipitasi. Nano partikel telah di karakterisasi dengan Scanning Electron Microscope (SEM), Vibrating Sample Magnetometer (VSM) dan X-Ray Diffractometer (XRD). Telah dipelajari efisiensi adsorpsi Fe3O4 yang disintesis terhadap kromium (VI) adalah larutan pada pH 6 dan pH 11. Data analisis memperlihatkan bahwa mekanisme adsorpsi sesuai dengan model adsorpsi isoterm Langmuir, dengan kapasitas adsorpsi 29,422 mg/g untuk pH 6 dan 21,739 mg/g untuk pH 11. Hasil percobaan menunjukkan bahwa efisiensi adsorpsi sangat bergantung pada kondisi pH, terjadi peningkatan dengan waktu pengocokan dan jumlah adsorben. Kondisi optimum adsorpsi tercapai pada pH 6. Kinetika adsorpsi dimodelkan dengan persamaan laju pseudo-second-order, dengan konstanta laju untuk pH 6 adalah 9,7087 mg/g dan untuk pH 11 adalah 12,1951mg/g. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6009 10.17146/jsmi.2012.13.2.4719 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 136-140 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6009/4422 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6010 2026-11-02T04:37:07Z jsmi:ART

SYNTHESIS, STRUCTURAL ANALYSIS AND INITIAL ELECTRIC SCRATCHING ON PbZrXTi(1-X)O3 PIEZOELECTRIC MATERIAL Syahfandi Ahda Mardiyanto Parikin PbZrxTi(1-x)O3 Piezoelectric material d33 Piezoelectric constant SYNTHESIS, STRUCTURAL ANALYSIS AND INITIAL ELECTRIC SCRATCHING ON PbZrXTi(1-X)O3 PIEZOELECTRIC MATERIAL. PbZrTi(1-x)O3(PZT) material is currently one of the highest- quality piezoelectric materials and has been widely used in various applications, including as sensors in the observation system in nuclear reactor cores. In this study, a solid state reaction method was used to synthesize PbZrTi(1-x)O3(PZT) material with variations in compaction pressure of 7000 and 5000 psi. The sample synthesized was analyzed by the crystal structure system using Rietveld method of X-ray diffraction (XRD) pattern. The fitting results from Highscore program showed compounds with perovskite crystals system of tetragonal (PbZr0.52Ti0.48O3) and rhombohedral (PbZr0,58Ti0,42O3) and PbTiO3 (tetragonal). The electrifying process using an electrical voltage of kv DC has been successfully carried out on synthesis products. The voltage source used is from the electronic circuit Television (TV) 14-21 inches which has a flyback component and then continues with a voltage drop by making a voltage divider. The polling results can be identified by measuring the piezoelectric constant with the d33 meter device. Optimization of polling parameters to the material temperature was obtained at 100 oC, then applied polling sample of PbZrTi(1-x)O3(PZT) material added by PVDF (1.5, 2.5 and 5% weight percent) to samples with the compaction of 7000 and 5000 psi. Maximum d33 measurement (61 x 10-12 C/N) was obtained on PZT material with a pellet pressure of 7000 psi. Increasing the addition of PVDF results in a reduction of d33. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6010 10.17146/jsmi.2018.20.1.4798 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 29-36 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6010/4421 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6011 2026-11-02T04:37:07Z jsmi:ART

MICRO-CRYSTAL STRUCTURE OF 57Fe15Cr25Ni0.32Mn0.96Si AUSTENITE STEEL AFTER 850°C-5H TEMPERATURE-QUENCHING TREATMENTS FOR HIGH TEMPERATURE MATERIAL APPLICATIONS Parikin Rudi Sumaryo S. Ahda Austenitic steel 57Fe15Cr25Ni0.32Mn0.96Si X-Rays Microstructure MICRO-CRYSTAL STRUCTURE OF 57Fe15Cr25Ni0.32Mn0.96Si AUSTENITE STEEL AFTER 850°C-5H TEMPERATURE-QUENCHING TREATMENTS FOR HIGH TEMPERATURE MATERIAL APPLICATIONS. A serial austenite stainless steel, namely A2-type, has been synthesized by using casting technique at temperature more than 1250 °C in the induction furnace that used an electromagnetic inductive-thermal system. The steel is dedicated for structural component material in multi-purpose applications such as in high-temperature operating environments. So, the material must be resistant to mechanical loads, high temperature, corrosion and irradiation. In order to increase the strength of materials, temperature-quenching treatments are required in some cooling media. Mineral element was extracted from crude ores of Indonesian mines and commercial scrap materials, i.e: ferro scrap, ferro chrome, nickel, manganese, and ferro silicon; all of them in granular shape were prepared to alloy the steel. Titanium was not added to this austenite low carbon steel. The OES-chemical composition in %wt of the materials is 57%Fe, 15%Cr, 25%Ni, 0.34%C and less than 0.1% of impurities that comprised of: titanium, phosphor, copper, niobium and sulphur elements in the steel. X-ray diffraction pattern shows that ascast material had an fcc crystal structure with lattice parameter of 3.632 Å. Meanwhile, two of samples, i.e: annealing and oil quench, have strictly similar lattice parameter to that of air (normalizing) quench (3.580 Å). On the other hand, the lattice parameter of water quenched samples has a slightly lower lattice parameter than the ascast lattice , i.e. 3.587 Å. The peak shift of (111) and (200) -plane in the diffraction profile, is very significant, approximately 0.63 degrees between ascast sample and the last two samples. Ascast microstructure reveals that the austenite phase grains look large and describe an undeformed structure, with an average grain size of about 6 mm, while the annealed sample was larger. Air- and oil- quenched sample microstructures showed a fine grain which was very different to water quenched sample microstructure that showed a coarse grain. The viscousity (h) of the quenching medium had an important role in the formation of grain boundary, because the rate of decreasing temperature was heavily influenced by the diffusion of heat from the high to low temperature spaces. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6011 10.17146/jsmi.2018.20.1.5407 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 37-43 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6011/4423 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6012 2026-10-30T06:25:06Z jsmi:ART

KARAKTERISASI STRONSIUM HEKSAFERIT KOERSIVITAS TINGGI HASIL SINTESIS DENGAN METODE KOPRESIPITASI Ridwan Didin S. Winatapura Magnet SrO 6 Fe2O3 Koersivitas magnet Metode kopresipitasi KARAKTERISASI STRONSIUM HEKSAFERIT KOERSIVITAS TINGGI HASIL SINTESIS DENGAN METODE KOPRESIPITASI. Stronsium heksaferit (SrO 6 Fe2O3) telah berhasil disintesis menggunakan metode kopresipitasi dari larutan Sr(NO3)2 6 H2O, Fe(NO3)3 9 H2O dan Tetramethyl ammonium Hidroksida (TMAOH). Prekursor yang diperoleh kemudian dikalsinasi pada suhu 800 oC hingga 1000 oC selama 2 jam. Fasa tunggal stronsium heksaferit telah terbentuk pada kalsinasi suhu 800 oC dengan koersivitas magnet 6 kOe dan cenderung menurun dengan peningkatan suhu annealing. Saturasi magnet ditentukan dari analisis kurva histeresis magnet menggunakan metode Jiles-Atherton (JA), berkisar dari 66 emu/g hingga 41 emu/g bergantung pada suhu annealing. Sifat magnet stronsium heksaferit hasil sintesis jauh lebih baik bila dibandingkan dengan produk komersial dengan koersivitas magnet yang hanya 1,7 kOe. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6012 10.17146/jsmi.2012.13.2.4720 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 141-145 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6012/4424 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6014 2026-11-02T04:37:07Z jsmi:ART

APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL Sunit Hendrana Erwin Krisman Syakbaniah Isna’im Yusmeri Neti Satria Tri Susilawati Sudirman sulfonated polystyrene polymer electrolyte fuel cell Microstructure Benzimidazole Ion conductivity APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL. Sulfonated polystyrene (SPS) is polyelectrolyte solid that widely used in many aplications. In this works SPS is applied for some parts of polymer electrolyte fuel cell membrane due sulfonate group available in the structure. The investigation involve the application for membrane with addition of small molecules, i.e. benzimidazole and evaluating its microstructure and performance. Application of SPS solution as binding agent in MEA will also be presented.  The results show that when using SPS as fuel cell membrane, the additon of small molecules such as benzimidazole would modify its microstrusture as well as improve its ion conductivity. Meanwhile, some improvement still required for application of SPS solution as binding agent for preparation of Membrane Electrode Assembly or MEA. BRIN Publishing (Penerbit BRIN) 2018-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6014 10.17146/jsmi.2018.20.1.5406 Jurnal Sains Materi Indonesia; Vol. 20 No. 1 (2018): Jurnal Sains dan Materi Indonesia; 44-49 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6014/4425 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6015 2026-10-30T06:25:06Z jsmi:ART

ANALISIS FASA DAN SIFAT MAGNETIK PADA KOMPOSIT BaFe12O19/NdFe14B HASIL MECHANICAL MILLING Prijo Sardjono Wisnu Ari Adi Perdamaian Sebayang Muljadi BaFe12O19/Nd2Fe14B Mechanical milling Struktur kristal Sifat magnetik ANALISIS FASA DAN SIFAT MAGNETIK PADA KOMPOSIT BaFe12O19/NdFe14B HASIL MECHANICAL MILLING. Telah dilakukan analisis fasa dan uji sifat magnetik pada bahan komposit magnet BaFe12O19/NdFe14B hasil mechanical milling menggunakan difraksi sinar-X dan GmbH Permagraph. Hasil refinement dari pola difraksi sinar-X menunjukkan bahwa sampel terdiri dari 2 fasa, yaitu fasa BaFe12O19 dan fasa NdFe14B. Sedangkan fraksi massa dari fasa BaFe12O19 dan fasa NdFe14B berturut-turut sebesar 79,89 % dan 20,11 %. Sampel bahan magnet BaFe12O19 dengan struktur kristal heksagonal (space group P 63/m m c), parameter kisi α = 5,9033(5) Å, b = 5,9033(5) Å dan c = 23,239(2) Å, α = β = 90o dan  = 120o, V = 701,3(1) Å3 dan  = 5.7172 g.cm-3. NdFe14B dengan struktur kristal simetri tetragonal (space group P 42/m n m (No. 136)) dengan parameter kisi sebesar a = 8,865(8) Å, b = 8,865(8) Å dan c = 12,269(1) Å, α = β = γ = 90o, V = 964,3(1) Å3 dan ρ = 7,7508 g.cm-3. Hasil pengukuran sifat magnetik menunjukkan bahwa bahan magnet NdFe14B sebelum dimilling memiliki medan koersivitas dan medan magnet rimanen berturut turut adalah 7984 Oe dan 5250 Gauss. Sedangkan untuk bahan magnet BaFe12O19 berturut-turut adalah 1625 Oe dan 1190 Gauss. Setelah dimilling selama 30 jam, medan koersivitas dan medan magnet rimanen meningkat di atas bahan magnet BaFe12O19 berturut-turut adalah 2650 Oe dan 1580 Gauss. Disimpulkan bahwa proses pencampuran ini tidak memberikan dampak rusaknya struktur fasa masing-masing. Partikel-partikel BaFe12O19 dapat dijadikan sebagai pelindung dari partikel-partikel NdFe14B yang memiliki sifat yang sangat korosif pada suhu kamar. Fasa BaFe12O19 ini relatif stabil pada suhu kamar sehingga partikel-partikel BaFe12O19 tidak mudah berubah setelah bercampur dengan partikel-partikel NdFe14B. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6015 10.17146/jsmi.2012.13.2.4721 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 146-152 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6015/4426 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6017 2026-10-30T06:25:06Z jsmi:ART

KAJIAN STRUKTUR KRISTAL DAN DIELEKTRISITAS NANOPARTIKEL MAGNETITE BERBASIS PASIR BESI DOPING Zn2+ HASIL SINTESIS METODE KOPRESIPITASI Ahmad Taufiq S. Bahtiar Sunaryono Nurul Hidayat A. Fuad M. Diantoro Arif Hidayat Suminar Pratapa Darminto Struktur kristal Dielektrisitas Nanopartikel Fe3O4 ion Zn2 Kopresipitasi KAJIAN STRUKTUR KRISTAL DAN DIELEKTRISITAS NANOPARTIKEL MAGNETITE BERBASIS PASIR BESI DOPING Zn2+ HASIL SINTESIS METODE KOPRESIPITASI. Nanopartikel Fe3O4 berbasis pasir besi doping ion Zn2+ telah berhasil disintesis melalui metode kopresipitasi pada suhu rendah. Bahan-bahan yang digunakan adalah pasir besi sebagai bahan utama, ZnCl2, HCl dan NH4OH. Karakterisasi dilakukan menggunakan X-Ray Flourescence (XRF), X-Ray Diffraction (XRD) dan kapasitansi meter digital AD5822. Hasil uji XRF menunjukkan bahwa komposisi unsur sampel sesuai dengan stoikiometri. Identifikasi fasa menggunakan sotware High Score Plus dan DDView+PDF2 menunjukan bahwa seluruh sampel terbentuk dalam fasa spinel kubik. Hasil analisis refinement menggunakan sofware Reitica menunjukkan semakin banyak doping ion Zn2+ pada Fe3O4, nilai parameter kisi kristal juga meningkat dengan ukuran kristal berorde nanometer. Hal ini sebagai konsekuensi dari pengaruh ukuran jari-jari ion Zn2+ yang menggantikan ion Fe2+. Sementara hasil uji dielekrisitas menunjukkan dengan meningkatnya doping ion Zn2+ pada Fe3O4, nilai dielektrisitasnya juga meningkat. Mekanisme ini adalah fenomena polarisasi ionik sebagai akibat dari menurunnya volume kristal dan jarak antar atom, sehingga momen dipol semakin besar. BRIN Publishing (Penerbit BRIN) 2012-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6017 10.17146/jsmi.2012.13.2.4722 Jurnal Sains Materi Indonesia; Vol. 13 No. 2 (2012): Jurnal Sains dan Materi Indonesia; 153-156 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6017/4427 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6018 2026-11-02T01:48:57Z jsmi:ART

TEKSTUR DEFORMASI DAN REKRISTALISASI BAJA LEMBARAN CANAI DINGIN BEBAS INTERSTISI Akhmad A. Korda Iskandar Muda Syoni Soepriyanto Tekstur deformasi Tekstur rekristalisasi Baja lembaran canai dingin Sifat mampu bentuk TEKSTUR DEFORMASI DAN REKRISTALISASI BAJA LEMBARAN CANAI DINGIN BEBAS INTERSTISI. Perkembangan tekstur kristalografi dipelajari pada baja lembaran bebas interstisi canai dingin. Tekstur yang diamati adalah tekstur deformasi setelah pencanaian dingin dan tekstur rekristalisasi atau tekstur annealing setelah proses annealing. Tekstur deformasi baja lembaran bebas interstisi dipelajarimelalui variasi persen reduksi ketebalan dengan selang reduksi antara 50,5% hingga 90 %. Sementara tekstur rekristalisasi dipelajari melalui variasi laju pemanasan annealing antara 32 oC/jam hingga 128 oC/jam, variasi waktu penahanan annealing antara 5 jam hingga 20 jam dan variasi suhu annealing dari 700 oC hingga 900 oC. Perkembangan tekstur deformasi dan rekristalisasi dipelajari melalui pengujian difraksi sinar-X. Tekstur kristalografi diukur untuk tekstur yang mempengaruhi sifat mampu bentuk, yaitu tekstur [111] dan tekstur [100]. Pengujian tarik terhadap spesimen pada orientasi yang berbeda terhadap arah pencanaian kemudian dilakukan untuk memperoleh nilai r yang merupakan parameter sifat mampu bentuk baja lembaran. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6018 10.17146/jsmi.2014.15.2.4357 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 57-66 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6018/4428 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6019 2026-11-02T01:48:57Z jsmi:ART

X-RAYS DIFFRACTION STUDY ON THE IRON NANO PARTICLES PREPARED BY TWO STEPS MILLING METHOD Engkir Sukirman Yosef Sarwanto X-rays diffraction Iron nanoparticles Two step milling X-RAYS DIFFRACTION STUDY ON THE IRON NANO PARTICLES PREPARED BY TWO STEPS MILLING METHOD. X-rays diffraction study on the iron nanoparticles prepared by two-step milling method has been carried out. First, the raw material of micro-sized Fe was crushed by High Energy Milling (HEM) in the presence of isopropyl alcohol, here in after referred to as FI precursor. FI precursor then was crushed again with planetary balls mill in Cetyl-Trimethyl- Ammonium Bromide (CTAB)media, here in after referred to as FC sample. The phases analysis in the two samples were carried out by X-rays diffraction technique using the Rietveld method. Crystallites size were calculated with the Debye-Scherrer formula and the size of particles were measured by means of Particles Size Analyzer (PSA). The magnetic properties of the two samples were characterized with Vibration Sample Magnetometer (VSM). The analysis result showed that each of FI and FC samples consist of Fe, γ-Fe2O3 and Fe3O4 phases in the formof the nano-sized powder ranging fromaround 7 to 10 nm. PSA data indicate that the particle size of FI and FC are the same, i.e., 7.5 nm with narrow size distribution. The VSM data revealed that both FI and FC samples display super paramagnetic behavior at room temperature. The magnetization value in FC sample has been reduced due to more of the mass fraction of Fe transforms into iron oxide phases. The particle size is generally not the same as the size of the crystallites and in particular for the nano-sized particles, the size of crystallites could be equal to or greater than the particle size due to the presence of polycrystalline aggregates. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6019 10.17146/jsmi.2014.15.2.4358 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 67-73 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6019/4429 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6020 2026-10-30T09:14:47Z jsmi:ART

SINTESIS DAN KARAKTERISASI POLIMER KOMPOSIT POLIPROPILEN MENGGUNAKAN FILLERTEPUNGTAPIOKAUNTUK BAHAN KEMASAN Deswita Aloma Karo Karo Grace Tj. Sulungbudi Sudirman Polimer komposit polipropilen Tepung tapioka Ramah lingkungan Biodegradabilitas SINTESIS DAN KARAKTERISASI POLIMER KOMPOSIT POLIPROPILEN MENGGUNAKAN FILLERTEPUNGTAPIOKAUNTUK BAHAN KEMASAN. Telah dilakukan pembuatan polimer komposit yang biodegradable sebagai bahan pengemas dengan cara menambahkan filler tepung tapioka, ke dalam polimer sintesis menggunakan metode blending. Polimer sintesis yang digunakan dalam penelitian ini adalah polipropilen melt flow 10 (PP10) dan polipropilen melt flow 35 (PP35). Variasi komposisi tapioka yang digunakan adalah 50 %berat, 55 %berat, 60 %berat, 65 %berat,70 %berat dan 75 %berat. Selanjutnya dilakukan karakterisasi meliputi uji mekanik, uji termal, uji strukturmikro dan uji biodegradabilitas. Hasil dari uji mekanik menunjukkan bahwa dengan penambahan filler tepung tapioka terjadi penurunan sifat mekanik. Uji termal menunjukkan bahwa tidak terjadi perubahan titik leleh dari termoplastik awalnya. Untuk uji strukturmikro memperlihatkan bahwa antara termoplastik dengan filler untuk konsentrasi dibawah 50%berat, komposit polimer ini tercampur secara homogen, sedangkan untuk konsentrasi lebih besar terjadi penggumpalan dan tidak merata. Hasil uji biodegradabilitas menunjukkan bahwa PP10-Tapioka dan PP35-Tapioka dapat digunakan sebagai bahan kemasan karena polimer komposit ini dapat terdegradasi di dalam tanah. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6020 10.17146/jsmi.2010.12.1.4556 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 24-29 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6020/4431 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6021 2026-10-30T09:14:47Z jsmi:ART

PEMBUATAN DAN PENCIRIAN POLIPADUAN POLISTIREN-PATI Tetty Kemala M. Syaeful Fahmi Suminar S. Achmadi Polistiren Pati Polipaduan Sifat mekanik Sifat termal PEMBUATAN DAN PENCIRIAN POLIPADUAN POLISTIREN-PATI. Polistiren berbentuk gabus merupakan polimer yang banyak digunakan namun sulit terdegradasi. Oleh karena itu, pada percobaan ini dikembangkan polipaduan polistiren-pati, untuk mendapatkan polimer yang mudah terdegradasi. Pengaruh tambahan gliserol sebagai pemlastis juga diamati melalui analisis mekanik dan termal. Polipaduan polistirenpati dihasilkan dengan mencampurkan larutan polistiren dan larutan pati dengan perbandingan komposisi berat (%) 60:40, 65:35, 70:30, 75:25 dan 80:20. Sebanyak 20% poli(asam laktat) ditambahkan sebagai bahan pengkompatibel. Sifat polipaduan dianalisis dengan pengujian kuat tarik, berat jenis dan sifat termal. Polipaduan polistiren-pati yang dihasilkan berwarna putih keruh dan rapuh. Kuat tarik dan berat jenis polipaduan berada pada kisaran kuat tarik dan berat jenis polistiren. Kuat tarik dan berat jenis meningkat seiring dengan meningkatnya komposisi polistiren dengan komposisi polistiren-pati terbaik 80:20. Puncak suhu transisi gelas dan titik leleh yang tunggal terlihat pada komposisi polistiren-pati 80:20. Pengaruh tambahan gliserol tidak teramati pada sifat termal, serta sedikit menyebabkan penurunan kuat tarik dan berat jenis. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6021 10.17146/jsmi.2010.12.1.4557 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 30-35 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6021/4432 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6022 2026-10-30T09:14:47Z jsmi:ART

SIFAT MEKANIK, STRUKTURMIKRO DAN SIFAT MAGNETIK MAGNET KOMPOSIT SrO.6Fe2O3 (SrM)-POLIMER TERMOPLASTIK DAN TERMOSET Grace Tj. Sulungbudi Aloma Karo Karo Mujamilah Sudirman Magnet komposit Heksaferit SrO.6Fe2O3 Polipropilen Polietilen Epoksi Poliester SIFAT MEKANIK, STRUKTURMIKRO DAN SIFAT MAGNETIK MAGNET KOMPOSIT SrO.6Fe2O3 (SrM)-POLIMER TERMOPLASTIK DAN TERMOSET. Penggunaan magnet dalam aplikasi di industri tidak selalu mensyaratkan adanya sifat magnetik yang tinggi. Oleh sebab itu, pemakaian polimer sebagai matriks yang berfungsi sebagai binder (perekat) dapat diterapkan sehingga akan diperoleh magnet komposit yang ringan, fleksibel dan murah. Pada penulisan ini dibahas magnet komposit heksaferit SrO.6Fe2O3 (SrM) dengan polimer termoplastik tipe polipropilen (PP) terdiri dari PP2 dan PP10 maupun tipe polietilen (PE) jenis LDPE, serta polimer termoset berbentuk epoksi dan poliester. Sintesis magnet komposit berbasis polimer termoplastik (PP2, PP10, LDPE) menggunakan metode blending sedangkan dengan polimer termoset menggunakan metode casting. Magnet komposit dengan polimer termoplastik dicampur dengan komposisi 50 %berat, 41 %berat, 38 %berat, 33 %berat dan 29 %berat SrM dengan suhu blending 160 oC untuk LDPE dan 180 sup>oC untuk PP2 dan PP10. Untuk magnet komposit termoset dicampur dengan komposisi 30 %berat, 40 %berat, 50 %berat dan 60 %berat SrM. Kemudian dilakukan pengujian yang meliputi : kekuatan tarik (tensile strength) dan perpanjangan putus. Strukturmikro pada permukaan bahan komposit diamati dengan menggunakan alat Scanning Electron Microscope (SEM) dan sifat kemagnetannya diukur dengan Vibrating Sample Magnetometer (VSM). Pengamatan strukturmikro dengan SEM menunjukkan terbentuknya partikel serbuk SrM dengan bentuk pipih berukuran 1,6 μm. Secara umum sifat mekanik magnet komposit untuk polimer polipropilen lebih baik dibandingkan magnet komposit yang menggunakan binder polietilen (LDPE). Untuk binder polipropilen PP10 lebih baik dibandingkan PP2. Sifat magnetik dari magnet komposit berbasis heksaferit mempunyai nilai yang hampir sama baik dengan binder polipropilen maupun polietilen. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6022 10.17146/jsmi.2010.12.1.4558 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 36-40 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6022/4433 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6023 2026-11-02T03:17:52Z jsmi:ART

SYNTHESIS AND ELECTROCHEMICAL CHARACTERIZATION OF Li3PO4 FORSOLID STATE ELECTROLYTES Heri Jodi Supardi Evvy Kartini Anne Zulfia Li3PO4 Solid state Electrolytes EIS Dielectric constant Conductivity SYNTHESIS AND ELECTROCHEMICAL CHARACTERIZATION OF Li3PO4 FORSOLID STATE ELECTROLYTES. The application of solid state electrolytes to solid state battery becomes important research area, recently, to overcome leakage and combustion issues involved in liquid electrolytes. Solid state electrolytes are safer, easily packaged and have several advantages, including easy fabrication, high ionic conductivity at room temperature and wide compositional range. Here in this study we characterized Li3PO4 for solid state electrolyte, synthesized by solid state reaction and wet chemical reaction methods. The samples were characterized using Electrochemical Impedance Spectrometer (EIS) to determine its electrical properties in addition to X-Ray Diffraction and Scanning Electron Microscope -Energy Dispersive X-Rays Spectroscopy (SEM-EDS) characterizations. Both of samples that have been characterized have a high electrical resistivity on the order of tens MW, with DC conductivity in order of 10-10 to 10-9 S/cm. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article https://ejournal.brin.go.id/jsmi/article/view/6023 10.17146/jsmi.2016.18.1.4181 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; - 2614-087X 1411-1098 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6024 2026-11-02T04:15:11Z jsmi:ART

EFEK PENAMBAHAN ASAM FENILFOSPONAT-SENG, TALK DAN TRIASETIN TERHADAP LAJU KRISTALISASI POLIASAM LAKTAT Lisman Suryanegara Putri Yuliansih Firda Aulya Syamani Raden Permana Budi Laksana Subyakto Zaenal Abidin Nanang Masruchin Yuliati Indrayani Poli asam laktat laju kristalisasi nucleating agent pemlastis Dalam aplikasi industri, salah satu kekurangan poli asam laktat (PLA) adalah kristalisasi yang lambat, sehingga meneyebabkan waktu yang lebih lama untuk mengolah PLA dibandingkan dengan polimer konvensional seperti polipropilen. Penelitian ini mengevaluasi pengaruh penambahan pengisi atau aditif terhadap laju kristalisasi PLA. PLA dilarutkan dalam diklorometana (DCM) dan dicampur dengan nucleating agent (seng asam fenilfosfonat atau talk) atau pelunak (triasetin) pada konsentrasi yang berbeda diikuti dengan pengeringan pada suhu kamar selama 24 jam dan  pengeringan oven selama 2 jam pada suhu 80 °C. Campuran kering PLA  ditempa panas pada 180 °C selama 10 menit. Differential Scanning Calorimetry (DSC) dilakukan untuk mengevaluasi tingkat kristalisasi. Hasil studi menunjukkan bahwa penambahan pengisi atau aditif mempercepat proses kristalisasi PLA. Asam seng fenilfosponat (PPA-Zn) adalah pengisi yang paling efektif untuk mempercepat laju kristalisasi PLA. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6024 10.17146/jsmi.2018.19.3.4265 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 93-97 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6024/4434 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6025 2026-10-30T09:14:47Z jsmi:ART

PEMBUATAN ELASTOMER TERMOPLASTIK MENGGUNAKAN INISIATOR POTASSIUM PERSULFATE DAN AMMONIUM PEROXYDISULFATE Dewi Sondari Dewi Sondari Dewi Sondari Agus Haryono Agus Haryono Agus Haryono Agus Haryono Agus Haryono M. Ghozali Ahmad Randy Kuntari Adi Suhardjo Ariyadi B Surasno Surasno Elastomer termoplastik Grafting Polimerisasi emulsi Inisiator Emulsifier PEMBUATAN ELASTOMER TERMOPLASTIK MENGGUNAKAN INISIATOR POTASSIUM PERSULFATE DAN AMMONIUM PEROXYDISULFATE. Elastomer termoplastik (ETP) adalah bahan polimer yang mempunyai sifat termoplastis dan elastis. Bahan ini mudah dicetak menjadi barang-barang jadi dan didaur ulang, sehingga untuk jangka panjang tidak merusak lingkungan. Telah dilakukan percobaan pembuatan ETP dengan menggunakan dua jenis inisiator yaitu potassium persulfate dan ammonium peroxydisulfate dengan perbandingan antara karet alam terhadap campuran monomer stiren/metil metakrilat %(v/v) sebesar 50 : 50 dan 60 : 40. Proses pembuatan elastomer termoplastik dilakukan dengan metode grafting secara polimerisasi emulsi pada suhu 65 oC selama 6 jam dengan menggunakan sodium dodesil sulfat sebagai emulsifier. Hasil analisis FT-IR menunjukkan bahwa proses grafting telah terjadi dengan munculnya peak baru pada panjang gelombang 1743 cm-1 dan 1519 cm-1 yang menunjukkan adanya gugus karbonil (C=O) dari metil metakrilat dan cincin benzen C=C yang berasal dari stiren. Dari spektrum 1H-NMR tampak adanya peak baru pada δ = 7,1 ppm merupakan proton aromatik dari gugus phenyl yang berasal dari stiren, puncak pada δ = 3,5 ppm tampak proton methoxy dari gugus acrylic yang berasal dari metil metakrilat yang tergrafting dan puncak pada δ = 5,1 ppm merupakan resonansi dari proton methyne yang berasal dari isopren. Hal ini menunjukkan bahwa telah terjadi grafting dari metil metakrilat dan stiren terhadap tulang punggung karet alam. Penggunaan inisiator mempengaruhi efisiensi grafting. Inisiator potassium persulfate menghasilkan efisiensi grafting 97,6% sedangkan efisiensi grafting dengan menggunakan inisiator ammonium peroxydisulfate sebesar 90,2% BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6025 10.17146/jsmi.2010.12.1.4589 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 41-45 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6025/4444 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6026 2026-11-02T04:15:11Z jsmi:ART

SIFAT KOMPOSIT EPOKSI BERPENGUAT SERAT BAMBU PADA AKIBAT PENYERAPAN AIR Gunawan Refiadi Yusi Siti Syamsiar Hermawan Judawisastra biokomposit epoksibiokomposit epoksi serat bambu petung kekuatan tarik Serat bambu memiliki potensi sebagai serat penguat pengganti serat gelas dalam pembuatan komposit polimer, karena sifatnya yang terbaharui dan ramah lingkungan. Namun, karena serat bambu memiliki sifat higroskopis, maka sifat tarik komposit yang dihasilkan dapat menurun akibat dari memburuknya ikatan antarmuka serat dan matriks. Penelitian ini bertujuan untuk mengkaji degradasi sifat tarik biokomposit epoksi berpenguat serat bambu petung akibat penyerapan air. Biokomposit epoksi berpenguat serat bambu petung dibuat dengan metode tekan panas dengan variasi serat tanpa alkalisasi (0% NaOH) dan dengan alkalisasi (5% NaOH). Pengujian biokomposit, dilakukan dengan cara uji air mendidih, uji tarik dan SEM. Kadar penyerapan air biokomposit tanpa alkalisasi lebih tinggi dibandingkan dengan biokomposit yang telah mengalami alkalisasi (5% NaOH). Penyerapan air mengakibatkan degradasi pada biokomposit dan menurunkan kekuatan tarik biokomposit hingga 23%. Perlakuan alkali 5% NaOH, dapat meminimalisir persentase penurunan kekuatan biokomposit, dengan persentase penurunan kekuatan tarik sebesar 17%. Hasil pemeriksaan pada permukaan patahan menunjang hasil pengujian tarik. Penurunan kekuatan tarik disebabkan oleh sifat dan penurunan kekuatan antar serat dan matriks BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6026 10.17146/jsmi.2018.19.3.4289 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 98-104 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6026/4435 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6027 2026-11-02T03:17:52Z jsmi:ART

STUDI ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DARI LEMBARAN POLYVINYL ALCOHOL DENGAN PENAMBAHAN LiClO4 SEBAGAI BAHAN ELEKTOLIT BATERAI Li-ION Indra Gunawan Wahyudianingsih Sudaryanto Bahan elektrolit Polyvinyl Alcohol LiClO4 Baterai Li-ion STUDI ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DARI LEMBARAN POLYVINYL ALCOHOL DENGAN PENAMBAHAN LiClO4 SEBAGAI BAHAN ELEKTOLIT BATERAI Li-ION. Telah disintesis bahan polimer elektolit padat untuk baterai Li ion, yaitu Polyvinyl Alcohol (PVA) dengan penambahan garam Lithium Perchlorate (LiClO4) dengan berbagai konsentrasi. Studi Electrochemical Impedance Spectroscopy (EIS) dari bahan ini dilakukan dengan membuat plot Nyquist dari pengukuran dengan LCR meter. Bahan elektrolit ini disiapkan dengan cara serbuk PVA dilarutkan ke dalam aquadest dan ditambahkan garam LiClO4 yang divariasi 0 % berat, 5 % berat, 10 % berat, 15 % berat, 20 % berat dan 25 % berat. Setelah proses pengeringan larutan, diperoleh lembaran PVA dengan penambahan garam LiClO4 sebagai bahan elektrolit baterai Li ion. Plot Nyquist untuk lembaran PVA yang ditambahkan garam LiClO4 yang divariasi 0 % berat, 5 % berat, 10 % berat, 15 % berat, 20 % berat dan 25 % berat telah dianalisis. Informasi resistensi elektrolit, ketahanan permukaan film dan resistensi transfer muatan diperoleh dengan pemodelan sirkuit yang setara sesuai dengan plot Nyquist. Hasil penelitian ini menunjukkan bahwa semakin tinggi kandungan LiClO4 didalam PVA semakin besar pula difusi ion lithium di dalam lembaran bahan elektrolit. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6027 10.17146/jsmi.2016.18.1.4173 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; 9-14 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6027/4436 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6028 2026-11-02T04:15:11Z jsmi:ART

Pengaruh Variasi Konsentrasi Hidrolisis Asam Sulfat Terhadap Sifat Me-kanik Plastik Selulosa Teregenerasi dari Kapas Limbah Tekstil dengan Pelarut NaOH/Urea Raden Reza Rizkiansyah Mardiyati Steven berat molekul hidrolisis kapas selulosa teregenerasi sifat mekanik Selulosa merupakan polimer alami dengan ketersediaan yang paling melimpah yang berpotensi untuk direkayasa menjadi suatu plastik biodegradable. Selulosa teregenerasi merupakan suatu material yang dibentuk dengan cara melarutkan selulosa dalam suatu palarut tertentu dan dicetak. Dalam penelitian ini, kapas limbah dari industri tekstil digunakan sebagai sumber selulosa. Kapas pada dasarnya memiliki kandungan selulosa yang sangat tinggi, yakni sekitar 86-98%. Selulosa diekstrak dari kapas limbah dengan hidrolisis asam sulfat dengan konsentrasi divariasikan pada 0,5; 1; 1,5; dan 0,5 M dengan temperatur 100°C selama 2 jam. Selulosa teregenerasi dibuat dengan melarutkan selulosa pada larutan NaOH 7%/Urea 12% dan dibentuk dengan metode solution casting. Berat molekul selulosa diukur dengan metode berat molekul rerata viskositas dengan viskometer Ubbelohde. Karakterisasi yang dilakukan menunjukkan peningkatan konsentrasi asam sulfat yang digunakan menyebabkan penurunan berat molekul selulosa yang terekstraksi. Berat molekul selulosa yang digunakan akan turut berpengaruh terhadap sifat mekanik dari plastik yang dihasilkan. Sifat optimum selulosa teregenerasi yang dihasilkan diperoleh dari selulosa dengan berat molekul 2.73 x 104 g/mol dari hasil hidrolisis 0,5 M, yang dimana memiliki kekuatan tarik, persen elongasi dan modulus masing-masing sebesar 49,24 MPa; 0.92 %; dan 11.39 GPa dengan densitas sebesar 1.53 g/cm3. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6028 10.17146/jsmi.2018.19.3.4264 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 105-112 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6028/4438 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6029 2026-11-02T01:48:57Z jsmi:ART

PENGARUH BEBERAPA JENIS DYE ORGANIK TERHADAP EFISIENSI SEL SURYA DYE SENSITIZED SOLAR CELL Dahyunir Dahlan Helga Dwi Fahyuan Dye organik DSC TiO2 Efisiensi PENGARUH BEBERAPA JENIS DYE ORGANIK TERHADAP EFISIENSI SEL SURYA DYE SENSITIZED SOLAR CELL. Telah dilakukan penelitian tentang pengaruh beberapa jenis dye organik, yaitu; dye dari kelopak bunga rosella, kulit buah manggis dan daging buah terung belanda terhadap efisiensi sel surya Dye Sensitized Solar Cell (DSC). DSC dibuat dengan menggunakan lapisan tipis TiO2  yang di sintesis dari prekursor TiCl4 dan methanol dengan penambahan CTAB. Lapisan TiO2 dianalisis menggunakan X-Ray Diffractometer (XRD) dan Scanning Electron Microscope (SEM), dimana diperoleh fase dominan adalah anatase dengan ukuran kristal rata-rata 29,15 nm. Karakteristik I-V menunjukkan bahwa efisiensi pada penggunaan cahaya 300 lux terhadap dye dari kelopak bunga rosella, kulit buah manggis dan daging buah terung belanda berturut-turut adalah 1,67; 2,65; dan 1,12. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6029 10.17146/jsmi.2014.15.2.4359 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 74-79 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6029/4437 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6030 2026-11-02T03:17:52Z jsmi:ART

STUDI PERUBAHAN STRUKTUR KRISTAL MATERIAL HASIL PERLAKUAN EQUAL CHANNEL ANGULAR PRESSING RUTE Bc DENGAN VARIASI JUMLAH PASS: STUDI KASUS SAMPEL ALUMINIUM PADUAN 5052 R. Ibrahim Purawiardi I. Nyoman Gede Putrayasa Astawa Effendi Mabruri ECAP Rute Bc Jumlah pass Regangan kisi Ukuran kristalit STUDI PERUBAHAN STRUKTUR KRISTAL MATERIAL HASIL PERLAKUAN EQUALCHANNEL ANGULAR PRESSING RUTE Bc DENGAN VARIASI JUMLAH PASS: STUDI KASUSSAMPELALUMINIUM PADUAN 5052. Proses Equal-Channel Angular Pressing (ECAP) merupakan salahsatu metode yang digunakan untuk memodifikasi ukuran butir pada logam pejal. Studi ini menganalisis pengaruhjumlah pass pada logam hasil perlakuan ECAP rute Bc, yang dititikberatkan pada perubahan struktur kristalyang terjadi. Studi ini bertujuan untuk mengetahui struktur kristal yang diinginkan, dengan diprediksi berdasarkanjumlah pass yang ditentukan. Untuk memudahkan studi ini, digunakan data sekunder hasil uji X-RayDiffractometer (XRD) pada sampel aluminium yang diberi perlakuan ECAP rute Bc dengan variasi jumlah passyang berbeda. Ada empat sampel yang digunakan. Satu sampel tidak diberikan perlakuan ECAP sebagai sampelpembanding, tiga sampel lainnya diberikan perlakuan ECAP rute Bc dengan variasi jumlah pass 2, 4, dan 8.Analisis kualitatif dan kuantitatif hasil uji XRD dilakukan menggunakan perangkat lunak Rigaku PDXL. Hasilanalisis menunjukkan bahwa perlakuan ECAP rute Bc pada sampel uji menyebabkan perubahan strukturkristal, regangan kisi, dan ukuran kristalit pada sampel uji. Perlakuan ECAP rute Bc dengan jumlah pass yangtepat dapat menyeragamkan struktur kristal menjadi lebih homogen dan rapi. Struktur kristal yang diinginkandapat diprediksi berdasarkan jumlah pass yang ditentukan. Namun, regangan kisi dan ukuran kristalit tidakdapat diprediksi berdasarkan jumlah pass yang ditentukan. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6030 10.17146/jsmi.2016.18.1.4182 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; 15-21 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6030/4440 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6031 2026-11-02T01:48:57Z jsmi:ART

PENGARUH LAJU ALIRAN GAS N2 TERHADAP KARAKTERISTIK KRISTAL FILM TIPIS GaN YANG DITUMBUHKAN DENGAN METODE SOL-GEL MENGGUNAKAN TEKNIK SPIN COATING Dadi Rusdiana Yuyu R.Tayubi Film tipis GaN Metode sol-gel Spin-coating Molaritas Ga2O3 Laju aliran gas Nitrogen XRD PENGARUH LAJU ALIRAN GAS N2 TERHADAP KARAKTERISTIK KRISTAL FILM TIPIS GaN YANGDITUMBUHKAN DENGAN METODE SOL-GEL MENGGUNAKAN TEKNIK SPIN COATING. Telah ditumbuhkan film tipis GaN di atas substrat silikon (111) dengan metode sol-gel menggunakan teknik spin-coating. Proses penumbuhan film tipis GaN dilakukan pada laju putaran spinner 1000 rpm, suhu penguapan pelarut 100 oC, suhu dekomposisi 400 oC,suhu deposisi 850 oC. Dua buah sampel film tipis GaN telah ditumbuhkan pada laju aliran gas nitrogen sebesar 16 sccm dan 40 sccm dengan molaritas Ga2O3 1,33 M. Film tipis GaN dikarakterisasi struktur kristalnya dengan menggunakan X-Ray Diffractometer (XRD). Hasil karakterisasi film tipis GaN dengan XRD menunjukkan kondisi optimal pada film tipis GaN yang ditumbuhkan dengan molaritas Ga2O3 1,33 M dan laju aliran gas nitrogen 40 sccm. Film tipis GaN mempunyai struktur heksagonal dengan parameter kisi a = (3,116 ± 0,035)Å dan c = (5,170 ± 0,053)Å BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6031 10.17146/jsmi.2014.15.2.4360 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 80-83 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6031/4439 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6032 2026-11-02T04:15:11Z jsmi:ART

EKSTRAKSI SELULOSA DARI SERBUK GERGAJI KAYU SENGON MELALUI PROSES DELIGNIFIKASI ALKALI ULTRASONIK Prida Novarita Trisanti Sena Setiawan H.P. Elysa Nura’ini Sumarno Kayu sengon Delignifikasi Alkali Ultrasonik Selulosa Kayu sengon (Albizia chinensis) merupakan salah satu jenis kayu yangmelimpah di Indonesia. Kandungan selulosa pada kayu sengon cukup tinggi sebesar 41,17%. Proses ekstraksi selulosa dari kayu sengon dapat dilakukan melalui proses delignifikasi atau penghilangan kandungan lignin. Umumnya, proses delignifikasi dilakukan dengan larutan alkali pada konsentrasi tinggi, suhu tinggi dan waktu yang lama.Agar konsentrasi alkali yang digunakan rendah dan waktu lebih pendek, proses delignifikasi dapat dilakukan dengan bantuan ultrasonik. Tujuan dari penelitian ini adalah mengetahui pengaruh kondisi operasi (suhu dan waktu) proses delignifikasi dengan ultrasonik terhadap kadar selulosa yang diperoleh. Proses delignifikasi dilakukan denganmencampur serbuk kayu sengon (40 mesh) dengan larutan NaOH (0,3M) dengan perbandingan 1:30 (w/v). Kondisi operasi yang digunakan adalah suhu 30 °C dan 40 °C pada berbagai waktu (10menit hingga 70menit). Setelah proses delignifikasi, produk di bleaching dengan NaOCl hingga warnanya menjadi putih. Analisis yang dilakukan antara lain adalah metode Chesson, X-Ray Diffraction (XRD) dan Scanning Electron Microscopy (SEM). Hasil dari analisa menunjukkan bahwa kristalinitas tertinggi diperoleh sebesar 77,05 % pada 40 °C selama 30 menit dan kadar lignin turun hingga mencapai 0,41%. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6032 10.17146/jsmi.2018.19.3.4496 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 113-119 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6032/4441 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6033 2026-11-02T04:15:11Z jsmi:ART

ANALISIS TEKSTUR PADALASAN STAINLESS STEEL 201 DENGAN TEKNIK DIFRAKSI Tri Hardi Priyanto Rifai Muslih Hery Mugiraharjo Bharoto Andon Insani Baja tahan karat austentik SS 201 Difraksi neutron Tekstur Daerah terpengaruh panas (HAZ) arah pengerolan MIG ANALISIS TEKSTUR PADALASAN STAINLESS STEEL 201 DENGAN TEKNIK DIFRAKSI NEUTRON. Baja tahan karat jenis austenitik merupakan baja tahan karat yang banyak dipakai dalam industri, salah satunya adalah industri rumah tangga. Dalam penelitian ini dilakukan karakterisasi Stainless Steel (SS) 201 yang banyak dijual di pasaran. Sebelum dilakukan karakterisasi, plat SS 201 dipotong dengan ukuran 150 mm × 120 mm× 10 mm, kemudian dibuat lubang berbentuk alur pada kedua permukaan, sehingga alur berbentuk X Double V Groove (DVG), selanjutnya alur DVG dilas dengan sistem pengelasan multi pass menggunakan metode pengelasan Metal Inert Gas (MIG). Bahan yang sudah dilas kemudian dikarakterisasi dengan teknik difraksi neutron untuk mendapatkan pola difraksi dan pole figure pada daerah pusat lasan FusionZone (FZ), daerah terpengaruh panas Heat Affected Zone (HAZ) dan daerah logam dasar Base Metal Zone (BMZ). Selanjutnya pole figure dianalisis dengan perangkat lunak Beartex untukmenentukan arah orientasi dan kekuatan tekstur pada ketiga daerah tersebut. Dari penelitian ini dapat disimpulkan bahwa pada daerah pusat lasan butir kristalit terorientasi {110}<112> dengan tipe Brass dengan indeks tekstur sekitar 3,12 m.r.d (multiple random distribution) yang ditunjukkan pada pole figure 200. Untuk daerah HAZ, tekstur paling kuat terorientasi pada {110}<001> atau tipe Goss dengan indeks tekstur 4,8 m.r.d. Pada daerah logamdasar, tekstur secara dominan terorientasi kearah {010}<100> atau tipe Cube dengan indeks tekstur tidak terlalu kuat, sekitar 1,53 m.r.d. Pada daerah pusat lasan, bidang (110) sejajar dengan sumbu normal (ND), dengan arah kristalit sejajar dengan arah pengerolan (RD) [112]. Pada daerah HAZ bidang (110) tersebut mengarah ke arah sumbu pengerolan [001], dengan indeks tekstur 1,5 kali lebih kuat dibanding FZ. Hal ini menunjukkan bahwa bidang (110) yang semula terorientasi kearah [112] pada FZ berubah menjadi sekitar 35,26º ke arah [001] pada daerah HAZ. Untuk daerah logamdasar bidang (010)mengarah sejajar dengan arah normal (ND) dan teksturmengarah pada arah pengerolan (RD) [100]. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6033 10.17146/jsmi.2018.19.3.4498 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 120-124 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6033/4443 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6034 2026-11-02T03:17:52Z jsmi:ART

SINTESIS KOPOLIMER CANGKOK SELULOSA DAN GLYCIDYL METHACRYLATE DENGAN METODE PRA IRADIASI DAN MENGGUNAKAN ETILENDIAMIN SEBAGAI GUGUS FUNGSI Meri Suhartini Asep Saefumilah Janrizka Betta C. Elisunarko Selulosa Pencangkokan Glisidil metakrilat Etilendiamin Penjerap ion logam SINTESIS KOPOLIMER CANGKOK SELULOSA DAN GLYCIDYL METHACRYLATE DENGAN METODE PRA IRADIASI DAN MENGGUNAKAN ETILENDIAMIN SEBAGAI GUGUS FUNGSI. Adsorben telah dikembangkan untuk mengatasi pencemaran logam berat. Dalam penelitian ini, adsorben merupakan selulosa yang dimodifikasi dengan metode pencangkokan dan penambahan gugus fungsi. Monomer Glycidiyl Methacrylate (GMA) dicangkokkan melalui proses pra iradiasi pada selulosa yang diiradiasi menggunakan berkas elektron dengan dosis radiasi 40 kGy. Sampel selanjutnya dimodifikasi dengan etilendiamin (selulosa glisidil metakrilat - etilendiamin atau SG-E). Keberhasilan dalam mensintesis kopolimer SG-E dapat dilihat dari perubahan gugus fungsi pada spektrum Fourier Transform-Infra Red (FT-IR), pengujian Thermo Gravimetry Analysis (TGA) dan Scanning Electron Microscope (SEM). Hasil tertinggi prosentase pencangkokan adalah 266% dengan konsentrasi GMA 20%. Kondisi optimum sintesis SG-E berada pada 80 oC selama 5 jam dengan konsentrasi etilendiamin 2 N memiliki konversi 12,41%. Hasil sintesis SG-E pada kondisi optimum adalah 2,05 mmol EDA/g. Kondisi proses penjerapan optimum dicapai pada pH 4 dan waktu kontak 150 menit. Proses adsorpsi isoterm Langmuir memiliki nilai regresi sebesar 0,98. Adsorpsi kinetik mengikuti laju reaksi orde 1. Modifikasi selulosa melalui pencangkokkan dengan GMA dengan gugus etilendiamin dapat memicu penjerapan ion logam. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article https://ejournal.brin.go.id/jsmi/article/view/6034 10.17146/jsmi.2016.18.1.4183 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; - 2614-087X 1411-1098 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6035 2026-11-02T04:15:11Z jsmi:ART

KETAHANANIMPAK,KEKERASAN DAN STRUKTUR MIKRO PADA BAJA TAHAN KARAT MARTENSITIK13 Cr3MO3Ni DENGAN VARIASI SUHU PERLAKUAN PANAS Franco Dwiky Praguna Moch. Syaiful Anwar Sunardi Efendi Mabruri BTK martensitik 13 Cr3Mo3Ni Austenisasi Impak SEM Dimple Cleavege Sudu turbinmerupakan salah satu bagian penting pada turbin yang bertujuan untukmemutar poros turbin sehingga menghasilkan energi listrik. Pada umumnya material yang digunakan pada sudu turbin adalah baja tahan karat martensitik, akan tetapimaterial tersebut mudah terjadi kegagalan.Mekanisme kegagalannya dipicu oleh adanya retakmikro dan unsur klorida didalam retakan tersebut sehingga akhirnya sudut tersebut mengalami patah. Adanya perbedaan perlakuan panas juga mempengaruhi nilai kekerasan yang berdampak pada jenis patahan yang dihasilkan pada baja tersebut. Pada penelitian ini bertujuan untuk mengevaluasi ketahanan impak, kekerasan dan strukturmikro pada baja tahan karatmartensitik 13 Cr3Mo3Ni dengan variasi suhu perlakuan panas serta mengevaluasi bentuk patahan pada baja tahan karat martensitik 13 Cr3Mo3Ni. Proses austenisasi dilakukan pada suhu 1000℃, 1050℃, dan 1100℃ dengan proses tempering pada suhu 500℃, 550℃, 600℃, 650℃, dan 700℃ dengan waktu penahanan 60 menit. Sedangkan uji mekanik yang dilakukan adalah uji kekerasan rockwell C dan uji impak charpy. Dan untukmengetahui strukturmikro yang terbentuk,maka dilakukan uji metalografi dan untuk mengetahui hasil patahan setelah dilakukannya uji impak,maka dilakukan uji SEM.Adapun hasil yang diperoleh dari penelitian ini yaitu nilai kekerasan terendah ditunjukkan pada suhu austenisasi 1000℃ dan suhu tempering 700℃, yaitu 38,13 HRC. Sedangkan nilai impak tertinggi ditunjukkan pada suhu austenisasi 1100℃ dan suhu tempering 650℃, yaitu 114,00 J. Adapun strukturmikro yang terbentuk adalah martensit, austenit sisa, ferit, dan karbida logam. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6035 10.17146/jsmi.2018.19.3.4502 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 125-130 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6035/4445 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6036 2026-11-02T04:15:11Z jsmi:ART

SINTESIS PADUAN Co-Cr MENGGUNAKAN METODE ULTRASONIK Marzuki Silalahi Dena Nadya Rahayu Bambang Sugeng Ferhat Aziz Sulistioso Giat Sukaryo Paduan Co-Cr Ultrasonik amplitudo microalloying struktur kristal Paduan Co-Cr merupakan material tahan suhu tinggi dan tahan korosi. Penelitian ini bertujuan mensistesis serbuk paduan Co-Cr dengan metode ultrasonik, kemudian dilanjutkan dengan proses sintering dalam kapsul kaca kuarsa. Iradiasi ultrasonik yang digunakan pada frekuensi 20 kHz dan amplitudo 40 % dengan komposisi Co : Cr sebesar 80 : 20.Waktu perlakuan sonikasi adalah selama 0 jam, 3 jam, 6 jam, 12 jam, 24 jam, dan 48 jamdalam larutan etanol. Setelah sonikasi selama 48 jam, fasa FCC dari Co mulai bertransformasi menjadi fasa HCP. Perlakuan ultrasonik terhadap campuran Co-Cr juga memberikan efek pengurangan ukuran partikel. Parameter kisi serbuk setelah ultrasonikasi 48 jam adalah: untuk HCP-Co a = b = 0,25074 nmdan c = 0,40699 nm, untuk FCC-Co a = b = c = 0,35411nm, dan untuk BCC-Cr a=b=c=0.28827 nm. Perlakuan ultrasonik selama 48 jam menhasilkan pembentukan paduan Co-Cr dengan persentasi berat sebesar 25,2124. Hasil sintering padatan Co-Cr menunjukkan parameter kisi HCP-Co memiliki nilai yaitu a = b = 0,25230 nm dan c=0,41223 nm, dan FCC-Co a = b = c = 0,35232 nm. Terbentuknya microalloying CoCr diindikasikan dari hasil EDS, teramati partikel yang mempunyai komposisi Co : Cr = 71,25 : 24,45. Paduan Co-Cr yang terbentuk setelah sintering pada 1300 oC adalah sebesar 15,33416 %berat. BRIN Publishing (Penerbit BRIN) 2018-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6036 10.17146/jsmi.2018.19.3.4500 Jurnal Sains Materi Indonesia; Vol. 19 No. 3 (2018): Jurnal Sains dan Materi Indonesia; 131-136 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6036/4446 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6037 2026-11-02T01:48:57Z jsmi:ART

CHARACTERISTIC OF (AgI)0.44(LiI)0.22(AgPO3)0.34 IONIC CONDUCTOR PREPARED BY MELT QUENCHING METHOD Makhsun T. Sakuma E. Kartini Solid electrolyte Super-ionic glass AgPO3 AgI-LiI-AgPO3 CHARACTERISTIC OF (AgI)0.44(LiI)0.22(AgPO3)0.34 IONIC CONDUCTOR PREPARED BY MELT QUENCHING METHOD. Characterization of (AgI)0.44(LiI)0.22(AgPO3)0.34 ionic conductor prepared by melt quenching method have been carried out by using X-Ray Diffractometer (XRD), Differential Scanning Calorimeter (DSC) and Inductance (L) Capacitance (C) Resistance (R) meter. X-ray diffraction pattern shows that the compound has a mixture of amorphous and small amount of crystalline form with several Bragg peaks correspond to AgI. The DSC thermograph shows that an endothermic peak at temperature ~420 K matches with the phase transition of AgI which reinforces that a number of AgI are not dissolved in the material of (AgI)0.44(LiI)0.22(AgPO3)0.34. The obtained dc ionic conductivity is around ~10-2 S/cm at ambient temperature. The activation energy has two values, 0.20 eV below ~380 K and 0.15 eV above ~380 K. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6037 10.17146/jsmi.2014.15.2.4361 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 84-87 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6037/4450 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6038 2026-11-02T03:17:52Z jsmi:ART

THE EFFECT OF STIRRING TECHNIQUES ON TiO2 NANOPARTICLE SIZE BY USINGA WET CHEMICAL METHOD Y. E. Gunanto K. Sinaga Y. P. Pratala Particle size Stirring technique Wet chemical method THE EFFECT OF STIRRING TECHNIQUES ON TiO2 NANOPARTICLE SIZE BY USINGA WET CHEMICAL METHOD. The TiO2 nanoparticles were synthesized by a wet chemical method. The influence of stirring on the particle size was investigated. In the first technique, the stirring was done during the process of mixing, while in the second technique the stirring was done after the mixing process is finished. The particle size was characterised using XRD, TEM, and PSA, while the BET surface area used. The first technique, obtained a fairly small grain size of about 12-50 nm, while the second technique obtained particle sizes between 1300-1600 nm. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6038 10.17146/jsmi.2016.18.1.4184 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; 30-34 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6038/4448 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6040 2026-11-02T06:34:03Z jsmi:ART

CHEMICAL DEGRADATION OF NAFION MEMBRANES UNDER PEMFC AS INVESTIGATED BY DFT METHOD Rochmad K. Sanjaya Juliandri Iman Rahayu Nurul Ismillayli Dhony Hermanto Nafion PEMFC DFT ∙OH radical ∙H radical CHEMICAL DEGRADATION OF NAFION MEMBRANES UNDER PEMFC AS INVESTIGATED BY DFT METHOD. An exsitu method has been developed to performance of Nafion's membrane in PEMFC (Proton Electrolyt Membrane Fuel Cells), caused by the chemical degradation of ·OH and ∙H radicals. The change of the chemical structure occurring during the degradation were primarily calculated of the relative energy of reactions by DFT (Density Functional Theory) method approach in the Gaussian software. This study aims to determine whether DFT method with functional B3LYP, PBEPBE, and B3PW91 and base sets 6-311++G can be used in determining the relative energy of a reaction and knowing the difference in role between ·OH and ∙H in the degradation process of the main chain Nafion with the final group are -CF2H, -CF=CF2 and -COOH. The three functionalities applied showed that the ·OH radical has more role than the ∙H radical in the degradation process of the Nafion main chain. In the -CF2H group was shown the relative energy value of reaction 2 is lower than reaction 5, in the -CF=CF2 group was shown the relative energy value of reaction 8* is lower than reaction 11 and in the -COOH group the relative energ value of reaction 14 is lower than reaction 16. By knowing the relative energy of the Nafion main chain degradation reaction with a certain final group and the role of certain radical compounds in the degradation process, the DFT method with functional B3LYP, PBEPBE and B3PW91 and base sets 6-311++G can recommend various modifications of the Nafion as a fuel cell membrane, particularly in increasing of membrane performance. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6040 10.17146/jsmi.2020.21.2.5582 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 49-55 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6040/4447 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6041 2026-11-02T06:34:03Z jsmi:ART

BIOSYNTHESIS AND CHARACTERIZATION OF GOLD NANOPARTICLES AND THEIR INTERACTION STUDY WITH METFORMIN Dian Anggraini Siti Suhartati Iwan Syahjoko Saputra Sudirman Biosynthesis Gold Nanoparticles Imperata cylindrica L Metformin BIOSYNTHESIS AND CHARACTERIZATION OF GOLD NANOPARTICLES AND THEIR INTERACTION STUDY WITH METFORMIN. Synthesis of gold nanoparticles successfully carried using Imperata cylindrica L leaf extract. In this study, the approach used through green synthesis method is a reaction betwen of the HAuCl4 solution (concentration variation as 3; 5; 7 x 10-4 M) with Imperata cylindrica L leaf extract. Results of UV-Vis showed of gold nanoparticles has a maximum wavelength at 530 nm with absorbance value of 1.4. Results of FTIR shows a shift the absorption peak at wavenumber of 3392 cm-1 to 3404 cm-1. PSA and PZC showed the distribution of gold nanoparticles was 48.84 nm with a charge of 20.5 mV. Gold nanoparticles has a spherical shape and an average particle size of 20 nm which can be seen from the results of the characterization using TEM. XRD showed crystalize size average of gold nanoparticles as 20.47 nm. The interaction between of gold nanoparticles with metformin can be seen in the absorbance decrease of 0.38 at a wavelength of 531 nm and the results of PSA shows an average particle size of AuNPs@metformin is 122 nm. From the characterization data can be concluded the gold nanoparticles were successfully synthesized using natural bioreductors by utilizing secondary metabolites from Imperata cylindrica L leaf extract. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6041 10.17146/jsmi.2020.21.2.5591 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 56-61 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6041/4449 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6043 2026-10-30T09:14:47Z jsmi:ART

PREPARATION OFPOLYURETHANE MICROCAPSULE USING 1,3 PROPANEDIOLAS THE POLYOL COMPONENT. Ahmad Randy Dewi Sondari Evi Triwulandari Murni Handayani Murni Handayani Murni Handayani Murni Handayani Self healing Encapsulation Isocyanate Polyol Microcapsule PREPARATION OFPOLYURETHANE MICROCAPSULE USING 1,3 PROPANEDIOLAS THE POLYOL COMPONENT. Self-healing property is the ability of a material to heal damages automatically and autonomously. Its application would be ranged from paint coating, anti corrosion coating, space-shuttle material, construction (concrete) and automotive. Extrinsic self healing requires self healing agent preembedded or incorporated into polymer matrix that would be released and close the damage in the polymer system, where the polymer itself is not healable. Healing agents are encapsulated or embedded into the material prior application. Example of monomer encapsulated to give self healing property is isophorone diisocyanate (IPDI) encapsulated in polyurethane shell. In this study, we studied the possibility of 1,3 propanediol, that can be derived from palm oil as polyol monomer for polyurethane microcapsule shell containing IPDI or stannous octoate as a self healing agent. Microcapsule in this study was prepared by interfacial polymerization technique to form IPDI monomer in polyurethane shell. FT-IR analysis show that polyurethane prepolymer produced still have unreacted isocyanate group necessary for interfacial polymerization of polyurethane. Morphological analyses of the microcapsule products show that the products have spherical shapes with smooth surface and some with wrinkled surface. The particle sizes were ranged from 40.29 to 526.80 μm. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6043 10.17146/jsmi.2010.12.1.4582 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 46-51 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6043/4454 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6044 2026-11-02T06:34:03Z jsmi:ART

EFFECTS OF CHITOSAN COATING ON THE PHYSICAL, MECHANICAL AND ANTIMICROBIAL PROPERTIES OF FOOD PACKAGING PAPER Kurnia Wiji Prasetiyo Deni Zulfiana Sita Heris Anita Widya Fatriasari Lisman Suryanegara Nanang Masruchin Sesmi Gutari antimicrobial activity chitosan coating food packaging paper oil palm fruit bunches pulp EFFECTS OF CHITOSAN COATING ON THE PHYSICAL, MECHANICAL AND ANTIMICROBIAL PROPERTIES OF FOOD PACKAGING PAPER. The coating process on food packaging paper is carried out to improve the food safety and health aspect from dangerous substance migration from food packaging into food. Chitosan has attracted interest in packaging, especially in food packaging as edible films and coatings. A paper from oil palm empty fruit bunches (OPEFB) pulp was coated with chitosan using different pulp weight (1, 1.5, 2 g) and chitosan content (0.25, 0.50, 0.75, 1 g) as parameters. The effect of chitosan as coating material on physical, mechanical, and antimicrobial properties was studied. The results showed that the density and grammage values of the paper increased after coating due to the increasing of chitosan content. The mechanical properties of the coated paper, such as tensile strength, tensile modulus and elongation, improved in line with the increase of chitosan content and pulp weight. The addition of chitosan on paper imparts antimicrobial properties against Gram-positive bacteria (Staphylococcus aureus) and Gram- negative bacteria (Escherichia coli). BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6044 10.17146/jsmi.2020.21.2.5600 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 62-68 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6044/4451 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6045 2026-11-02T06:34:03Z jsmi:ART

COMPARATION OF RUBBER MILLING PROCESS TO PRODUCE NATURAL RUBBER COUMPOUNDS USING MODIFIED AND UNMODIFIED LOCAL CLAY FILLER Abu Hasan Martha Aznury Indah Purnamasari Muhammad Zaman Robert Junaidi Rahmaniar natural rubber composites curing characteristics modified clay rubber milling process COMPARISON OF RUBBER MILLING PROCESS TO PRODUCE NATURAL RUBBER COMPOUNDS USING MODIFIED AND UNMODIFIED LOCAL CLAY FILLER. Many researchers have studied the effect of modified clay as filler on rubber compounds for both natural rubber and synthetic rubber. Various chemicals are used as clay modifiers. In the rubber milling process, modified clay is directly used as filler after pretreatment with clay modifier. However, clay modifiers can also be milled together with original clay during the rubber mastication and milling process. Thus both of these methods certainly produce different physical properties, so the comparison of the two rubber milling processes is the focus of this research. The analysis of the curing characteristics and physical properties of vulcanized natural rubber was carried out with a rheometer and physical properties test units. Thermal analysis was carried out using TG/DTA and dispersion of filler on the rubber compound was analyzed by SEM. The results of the curing characteristic of the rubber compound and the physical properties of vulcanization showed that there was an effect due to the comparison of the rubber milling process. Modified clay using JH-S69 is better than JH-S69 milled with original clay and vice versa occurs in PEG 4000 which is used as clay modifier. PEG 4000 which is milled together with original clay produces curing characteristic and physical properties of vulcanization better than pretreatment of clay to be modified clay. This analysis is in line with the analysis using SEM. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6045 10.17146/jsmi.2020.21.2.5797 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 69-75 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6045/4453 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6046 2026-10-30T09:14:47Z jsmi:ART

APLIKASI MEMBRAN NANOKOMPOSIT SEBAGAI ELEKTROLIT SEL BAHAN BAKAR HIDROGEN PADA PROTON EXCHANGE MEMBRANE FUEL CELL Mahreni Membran Nanokomposit Nafion-SiO2 -PWA PEMFC Kelembaban APLIKASI MEMBRAN NANOKOMPOSIT SEBAGAI ELEKTROLIT SEL BAHAN BAKAR HIDROGEN PADA PROTON EXCHANGE MEMBRANE FUEL CELL. Sel bahan bakar hidrogen jenis Proton Exchange Membrane Fuel Cell (PEMFC) saat ini masih dalam pengembangan dan komersialisasi. Beberapa hambatan komersialisasi di antaranya membran Nafion sebagai elektrolit sangat sensitif terhadap kelembaban. Maka Nafion harus dimodifikasi dengan cara membuat komposit Nafion-SiO2-HPA dengan tujuan meningkatkan ketahanan elektrolit terhadap fluktuasi kelembaban selama sel digunakan. Penelitian dilakukan dengan mencampur larutan Nafion dengan tetra etoksi orto silikat (TEOS) dan bahan konduktif phosphotungstic acid (PWA) dengan memvariasi perbandingan Nafion, TEOS dan PWA. Membran dihasilkan dengan cara memanaskan campuran Nafion, TEOS dan PWA dengan memvariasi suhu penguapan, waktu dan suhu annealing sehingga didapatkan membran dengan penampakan transparan. Membran yang dihasilkan dianalisis terhadap sifat fisika, kimia dan sifat elektrokimia dengan mengaplikasikan membran sebagai elektrolit PEMFC pada berbagai kelembaban dan suhu operasi. Hasil penelitian menunjukkan bahwa pada suhu rendah 30 oC hingga 90 oC dan kelembaban tinggi (100 %RH), membran Nafion murni lebih baik dibandingkan membran komposit Nafion-SiO2-PWA, tetapi pada kelembaban rendah membran komposit lebih baik dibanding membran Nafion murni dan dapat disimpulkan bahwa membran komposit Nafion-SiO2-PWA dapat menggantikan peranan membran Nafion murni sebagai elektrolit PEMFC yang beroperasi pada kelembaban rendah (40 %RH) dan suhu di antara 30 oC hingga 90 oC. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6046 10.17146/jsmi.2010.12.1.4583 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 52-58 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6046/4456 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6048 2026-11-02T06:34:03Z jsmi:ART

MICROWAVE-ASSISTED CENTRIFUGAL SPINNING OF GELATIN MICROFIBERS Kaido Siimon Yu Yu Aung Centrifugal spinning Fibers Gelatin Cross-linking Eco-friendly MICROWAVE-ASSISTED CENTRIFUGAL SPINNING OF GELATIN MICROFIBERS. Herein, we disclose a method for preparing polymeric microfibers. According to an embodiment of the method, gelatin fibers were prepared from 50% aqueous gelatin solution by centrifugal spinning. The produced material feels similar to wool to the touch. Average fiber diameter was determined to be 40 μm. Thermal stability of the material is similar to that of gelatin fibers prepared by other techniques, e.g. electrospinning. Elastic modulus of the fibrous material was determined to be 230 MPa and its toughness was found to be 160 kJ/m3. The described method is one of the fastest low-cost lab-scale fiber production techniques available (as a practical example, the speed of fiber production was roughly 5 g/s) and could be used to prepare various polymeric fibers in an eco-friendly way for a wide range of applications, including textile industry, tissue engineering and drug delivery. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6048 10.17146/jsmi.2020.21.2.5834 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 76-83 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6048/4455 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6049 2026-11-02T06:34:03Z jsmi:ART

SYNTHESIS AND CHARACTERIZATION OF LiFePO4/PPy/CLAY COMPOSITE AS CATHODE MATERIAL FOR Li-ION BATTERY Indra Gunawan Yustinus P. Sudaryanto Jadigia Ginting LiFePO4 clay composites Li-Ion battery SYNTHESIS AND CHARACTERIZATION OF LiFePO4/PPy/CLAY COMPOSITE AS CATHODE MATERIAL FOR Li-ION BATTERY. Conductor polymers have been used previously as a conducting agent or carbon source in various sol-gel and solid state methods to increase the conductivity of LiFePO4. The composite of LiFePO4/PPy/Clay were synthesized by mixing LiFePO4 and clay with a Ppy solution. The characterizations were done by using X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM) and LCR meter respectively. From XRD analysis it could be deduced that LiFePO4 has an ordered olivine structure with a Pnma space group. The SEM images provide clear evidence that small crystal particles of LiFePO4 either coat the surface of the clay particles or lie among them. These LiFePO4 particles have a small particle size (100–500 nm). With the increasing of LiFePO4 content, these small crystal particles at the surface or among the clay particles are increased. Increasing the PPy content to increase the conductivity of the material obtained. With the addition of clay from 5 to 10 wt. %, the DC conductivity of the blends is clearly observed to increase up to three orders of magnitude. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6049 10.17146/jsmi.2020.21.2.5805 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 84-88 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6049/4457 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6050 2026-11-02T03:17:52Z jsmi:ART

EFEKTIVITAS NANOKOMPOSIT TiO2/ZEOLIT PADA PANEL KERAMIK DALAM PENURUNAN LIMBAH FENOL Siti Naimah Silvie Ardhanie Aviandharie Rahyani Ermawati Nanokomposit TiO2 Zeolit Keramik Limbah fenol EFEKTIVITAS NANOKOMPOSIT TiO2/ZEOLIT PADA PANEL KERAMIK DALAM PENURUNAN LIMBAH FENOL. Telah dilakukan penelitian mengenai efektivitas nanokomposit TiO2/zeolit (nanokomposit TZ) pada panel keramik dalam penurunan limbah fenol. Penelitian aplikasi nanokomposit TZ telah banyak dilakukan dalam menurunkan limbah cair organik secara fotokatalisis. Jenis nanokomposit yang banyak digunakan dalam bentuk serbuk, granul, lapisan tipis pada kaca dan stainless steel. Oleh karena itu, penelitian ini akan memanfaatkan panel keramik jenis water base dan solvent base sebagai media menempelnya nanokomposit TZ. Hasil penelitian menunjukkan keramik solvent base memiliki tekstur yang mudah melekatkan nanokomposit TZ sehingga komposit tidak mudah terkelupas selama proses aplikasi, proses aktivasi dan reaktivasi komposit serta tahan pada suhu 350 °C sedangkan keramik water base hanya tahan pada suhu 200°C di bawah suhu yang diperlukan untuk aktivasi komposit yaitu 350 °C. Keramik solvent base dibuat dengan ketebalan 0,5 mm dan luas area 0,12 m2. Variabel flow rate yang digunakan adalah 15 mL/menit, 20 mL/menit, 25 mL/menit, 30 mL/menit, 35 mL/menit, 40 mL/menit, 45 mL/menit, 50 mL/menit dan diperoleh hasil penurunan fenol terbaik 3,59 mg/L pada flow rate 20 mL/menit. Flow rate optimum tersebut digunakan dalam menguji efektivitas nanokomposit TZ pada panel keramik solvent base setelah dipakai beberapa kali. Persentase penurunan limbah fenol setiap pengulangan tidak berbeda signifikan yaitu pemakaian pertama 63,8%, kedua 63,7% dan ketiga 63,2%. Hal ini menunjukkan bahwa lapisan komposit masih melekat kuat pada keramik dan masih efektif. Panel keramik dapat menjadi alternatif sebagai media nanokomposit karena ringan, kuat, mudah dibentuk, tahan panas sehingga akan mempermudah penggunaan nanokomposit dalam aplikasinya. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6050 10.17146/jsmi.2016.18.1.4185 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; 35-40 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6050/4459 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6051 2026-11-02T06:34:03Z jsmi:ART

EFFECT OF ANNEALING CYCLES ON DEEP DRAWABILITY OF LOW CARBON TITANIUM ADDED STEEL Iskandar Muda Azwar Manaf Low carbon titanium added annealing cycle recrystallization texture deep drawability EFFECT OF ANNEALING CYCLES ON DEEP DRAWABILITY OF LOW CARBON TITANIUM ADDED STEEL. Maximum mechanical properties and deep drawability of low carbon titanium added steels was obtained after heat treatment with simulation batch annealing cycles in an industrial process. The effect of holding times and holding temperatures on deep drawability were studied using tensile test for measuring normal anisotropy (r-value) and strain hardening exponent (n-value). Scanning electron microscope were employed for observation of microstructure in steel sheets. X-ray diffraction with pole figure techniques were also used for measuring texture of annealing. Results showed that as the temperature was increased up to 900 oC, both r and n values increased gradually and peaked in the temperature of 850 oC. This results showed that formability of sheet materials increased until batch annealing temperature reach 850 oC as increasing the ratio of intensities {111} /{100}. The largest mean r value of almost 2.6 was obtained in slow heating at holding temperature of 850 oC with n value of 0.27. BRIN Publishing (Penerbit BRIN) 2020-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6051 10.17146/jsmi.2020.21.2.5799 Jurnal Sains Materi Indonesia; Vol. 21 No. 2 (2020): Jurnal Sains dan Materi Indonesia; 89-94 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6051/4458 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6053 2026-11-02T03:17:52Z jsmi:ART

PENGARUH SUHU KALSINASI PADA PROSES DEKOMPOSISI DOLOMIT Ahmad Royani Eko Sulistiyono Deddy Sufiandi Dekomposisi Kalsinasi Dolomit Perubahan fasa PENGARUH SUHU KALSINASI PADA PROSES DEKOMPOSISI DOLOMIT. Proses dekomposisi dolomit menjadi MgO dan CaO merupakan proses penting mengingat kedua oksida tersebut banyak digunakan dalam berbagai aplikasi. Untuk melihat pengaruh suhu proses kalsinasi terhadap dekomposisi dolomit menjadi MgO dan CaO, maka dilakukan kalsinasi. Proses kalsinasi menggunakan tungku Muffle furnace dengan suhu sebesar 500oC, 600 oC, 700oC, 800 dan 900oC. Sebanyak kurang lebih 100 gram/sampel dolomit dimasukkan dalam tungku dan dipanaskan dengan laju pemanasan 10 oC/menit pada berbagai suhu yang kemudian ditahan masing-masing selama 1 jam, 2 jam, 3 jam, 4 dan 5 jam. Produk kalsinasi kemudian ditimbang dan dikarakterisasi dengan X-Ray Diffraction (XRD) dan Scanning Electron Microscope (SEM). Hasil percobaan menunjukkan kalsinasi dolomit semakin meningkat seiring dengan kenaikkan suhu kalsinasi. Proses kalsinasi dolomit optimum tercapai pada suhu 900oC selama 4 jam dengan pengurang berat mencapai 46,74 %. Berdasarkan perhitungan stoikiometri pengurangan berat 46,74 % menunjukkan bahwa 97,78 % dolomit terdekomposisi menjadi MgO dan CaO. Pembentukan fasa MgO dan CaO dari dolomit melalui dua tahapan yaitu tahapan pembentukan fasa MgO-CaCO3 pada suhu 700 oC dan tahapan pembentukan CaO pada suhu 800oC - 900oC. Kesimpulan yang didapatkan dari proses kalsinasi dolomit ini adalah peningkatan suhu kalsinasi dapat meningkatkan proses dekomposisi dolomit menjadi fasa MgO dan CaO. BRIN Publishing (Penerbit BRIN) 2016-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6053 10.17146/jsmi.2016.18.1.4186 Jurnal Sains Materi Indonesia; Vol. 18 No. 1 (2016): Jurnal Sains dan Materi Indonesia; 41-46 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6053/4460 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6054 2026-10-30T09:14:47Z jsmi:ART

SINTESIS DAN KARAKTERISASI ELEKTROLIT PADAT BERBASIS GELAS LITHIUM (AgI)0,33(LiI)0,33(LiPO3)0,34 Makhsun Makhsun Evvy Kartini Elektrolit padat Gelas lithium (AgI)0,33(LiI)0,33(LiPO3 ) 0,34 SINTESIS DAN KARAKTERISASI ELEKTROLIT PADAT BERBASIS GELAS LITHIUM (AgI)0,33(LiI)0,33(LiPO3)0,34. Telah dilakukan sintesis dan karakterisasi elektrolit padat berbasis gelas lithium (AgI)0,33(LiI)0,33(LiPO3)0,34. Sintesis dilakukan menggunakan metode melt quenching dengan cara mencampurkan bahan LiPO3 dengan AgI dan LiI dengan komposisi tertentu. Karakterisasi difraksi sinar-X menunjukkan bahwa substrat gelas LiPO3 bersifat amorf, sedangkan pada bahan (AgI)0,33(LiI)0,33(LiPO3)0,34 (LIXY 33,33) terdapat presipitat yang diduga dari AgI yang tidak larut. Karakterisasi sifat termal menggunakan DSC memperlihatkan bahwa suhu transisi fasa (Tf) untuk AgI adalah 150 oC, suhu transisi fasa tersebut juga terlihat pada LIXY 33,33. Karakterisasi morfologi dengan SEM memperlihatkan permukaan yang mulus tanpa adanya butiran-butiran pada komponen LiPO3, sementara pada komponen LIXY 33,33 terlihat adanya bentuk butiran yang menyerupai AgI. Konduktivitas yang diperoleh pada komponen LIXY 33,33 adalah 2,35 x 10-6 S/cm lebih tinggi dari LiPO3 yaitu 1,24 x 10-7 S/cm BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6054 10.17146/jsmi.2010.12.1.4584 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 59-63 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6054/4462 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6056 2026-10-30T09:14:47Z jsmi:ART

GROWTH OF CARBON NANOTUBE FROM NANOSTRUCTURED COMPOSITE OF Fe-C USING ION IMPLANTATION TECHNIQUE Salim Mustofa Salim Mustofa Salim Mustofa Carbon Nanotube Integrated Sensor System Composite of Fe-C Ion Implantation GROWTH OF CARBON NANOTUBE FROM NANOSTRUCTURED COMPOSITE OF Fe-C USING ION IMPLANTATION TECHNIQUE. Growth of carbon nanotube (CNT) from nanostructured composite of Fe-C has been carried out using ion implantation technique. The CNT developed here is expected to be used as an Integrated Sensor System, because CNT offer promises for future nano-electronic sensor applications, and reliably controlling CNT growth has been a big challenge. Nanostructured composite of Fe-C was prepared by milling for 50 hours. The size of Fe-C powder was determined from Scanning Electron Microscope (SEM) image. Milled powder then was compressed to get pellet form of Fe-C, and used as a target in fabricating thin film of Fe-C on Si(100) substrate using sputtering technique. Further, the ion implantation was done against the Fe-C thin film. The ion source using Argon gas, in order to make growth of CNT until the densitiy dose of 5 x 1015 ions/cm2 . The phase of formed CNT was identified by X-Ray Diffractometer (XRD), the morphology of surface was observed by SEM. From this research, it has been showed that the milled composite of Fe-C has a powder size until nano order size. From XRD data, it is identified that only Fe and C peaks were confirmed. On the other hand, the observation on the surface of Fe-C thin film showed the growth of CNT BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6056 10.17146/jsmi.2010.12.1.4585 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 64-69 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6056/4468 https://ejournal.brin.go.id/jsmi/article/view/6056/4469 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6058 2026-11-02T06:20:12Z jsmi:ART

Growth of ZnS:Ag:Cu Thin Film Deposited on Glass Substrates using Thermal Evaporation Technique for Alpha-photovoltaic Emy Mulyani Tjipto Sujitno Dessy Purbandari Ferdiansjah Sayono Plasma nitridation ZnS:Ag:Cu thin layer Thermal evaporation Glass substrate Deposition This paper presents the research on the growth of ZnS:Ag:Cu thin film on a glass substrate as a radio-luminescent material. The SRIM/TRIM software is used to determine the optimum thickness based on an energy deposition depth of 5.485 MeV Am 241 alpha radiation source on ZnS:Ag:Cu material. To increase the adhesive strength of the coating, initially, the glass substrate is etched using a plasma glow discharged at 280°C for 15 minutes. Multiple coatings of ZnS:Ag:Cu were  etched on the glass substrate; this was carried out using a thermal evaporation technique to achieve the optimal thickness (based on SRIM/TRIM simulation). The thin film thickness was observed using a scanning electron microscope (SEM). The optical properties of the un-etched, etched glass substrate and thin-film were characterized using UV-Vis spectrometer. Based on SRIM/TRIM simulation, the optimal thickness is 22 mm which can be achieved by coating three times. From optical properties of ZnS:Ag:Cu thin film and after being analysed using Taue plot method, it is found that the energy gap of ZnS:Ag:Cu thin film is 2.48 eV. It can be concluded that the addition of Ag and Cu doped decrease the energy gap of ZnS (3.66 eV). BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6058 10.17146/jsmi.2019.21.1.5656 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 8-12 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6058/4464 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6059 2026-11-02T06:20:12Z jsmi:ART

Study of Microstructural and Corrosion Properties of Aluminium Alloy 7075 after Plasma Nitriding Haerul Ahmadi Rizky Abdul Aziz Suprapto Tjipto Sujitno Sophie Hapsari plasma nitriding aluminium alloy 7075 corrosion Plasma nitriding is a treatment process of metals by depositing nitrogen into metal that considered to be nitrided by mean of increasing the mechanical, physical, and chemical properties of the metal. This treatment will form a hard layer compund of Al-N on the surface of the sample. In this study, aluminium alloy 7075 was nitrided which the application of it to structural part of aircraft makes it vulnarable to not only corrosion and wear attack but also decreasing the hardness of the material. One method to overcome these issues is plasma nitriding. The purpose of of this research is to do the characterizations of plasma nitrided aluminium alloy 7075 regarding its microstructure, mechanical, and chemical properties. The characterizations that had been done were microhardness Vickers testing, SEM-EDX, and electrochemical corrosion testing Potensiostat. The hardness of the sample increased 55% from 75,88 VHN (raw material) to 117,68 VHN (at optimum parameter). The depth of the white layer of plasma nitriding is approximately 6 µm, while the EDX result reported carbon, oxygen, and nitrogen presence. Corrosion testing showed that the highest corrosion rate is on the raw material, 0,15393 mpy. While the optimum one is 0,07184 mpy. BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6059 10.17146/jsmi.2019.21.1.5649 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 1-7 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6059/4465 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6060 2026-11-02T06:20:12Z jsmi:ART

THE EFFECT OF RATIO OF GAS MIXTURE FOR MECHANICAL PROPERTIES AND CRYSTAL STRUCTURES ON 316L STAINLESS STEEL BIOMATERIAL USING DC SPUTTERING TECHNIQUE Wiwien Andriyanti Bunyamin Arsyad Ravendianto Tjipto Sujitno Suprapto Dwi Priyantoro DC sputtering 316L stainless steel Titanium nitride 316L stainless steel is widely used as an orthopedic implant due to its high corrosion resistance and biocompatibility, but the weakness of these materials is low hardness and high wear. The surface must be modified to improve the material. For the purpose, a titanium nitride (TiN) thin film was deposited on the surface of SS 316L using DC sputtering technique. The sputtering process was carried out for various of a gas mixture of argon (Ar) and nitrogen (N2) such as  90 Ar: 10N2, 80 Ar: 20 N2, 70 Ar: N2, and 60 Ar: 40 N2, while the other parameters kept constant.  The objective of the gas mixture variation is to find out the optimum condition of ratio Ar: N2 gas mixture with the highest hardness and lowest wear resistance. From experiment done it’s found that the highest hardness in order of 232.02 VHN, while before being coated the hardness is 133.61 VHN, or there is an increasing hardness by factor 1.73, while the wear resistance reduces from  11.6 × 10-8 mm2/kg to 1.17 × 10-8 mm2/kg or there is reducing in wear resistance by factor 9.9.  The optimum conditions were achieved at Ar: N2 ratio = 70:30. From XRD analysis, it can be concluded that the crystal structure of TiN thin film is cubic with the peaks (111), (200), (202), (311) and (222). From cross-section microstructure analysis using Scanning Microscope Electron (SEM), it’s found the thickness of the thin film is 744 nm. BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6060 10.17146/jsmi.2019.21.1.5657 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 13-20 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6060/4466 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6061 2026-11-02T01:48:57Z jsmi:ART

PREPARASI DAN KARAKTERISASI POLIMORFISME OBAT ANTI MALARIA ARTESUNATE Timbul Partogi H. Sundani N. Soewandhi Jessie S. Pamudji Wikarsa Saleh Artesunate Polimorfisme Anti Malaria Padatan Freeze Drying PREPARASI DAN KARAKTERISASI POLIMORFISME OBAT ANTI MALARIA ARTESUNATE. Artesunate(AS) adalah derivat semisintetis dari Artemisinin, suatu obat anti malaria dari tumbuhan Artemisia annua yang terdiri atas struktur seskuiterpen endoperoksida. AS merupakan derivat artemisinin yang paling banyak digunakan sebagai obat antimalaria untuk menggantikan banyak obat malaria lain yang telah resisten terhadap malaria falsiparum. Khusus untuk AS, belum banyak studi yang dilakukan maupun literatur yang tersedia untuk mempelajari keadaan padatan (solid state) dan khususnya keberadaan polimorfisme dari AS. Polimorfisme dari suatu padatan memiliki fasa kristalin yang berbeda dalam susunan kisi kristal internalnya. Perbedaan kisi kristal (polimorfisme maupun pseudopolimorfisme) ini dalam bidang farmasi akan memberikan pengaruh terhadap ketersediaan hayati obat dan khasiat penggunaan obat secara klinis. Tujuan penelitian ini adalah untuk memperoleh dan mengamati perbedaan polimorfisme AS serta mengkarakterisasinya dengan analisis PXRD, IR dan DTA. Untuk lebih memperkuat hasil analisis, dilakukan juga cara mikroskopik baik dengan Hot Stage Microscopy (HSM) maupun denganScanning Electron Microscope (SEM). Hasil penelitian menunjukkan keberadaan dua bentuk polimorf yang berbeda dari obat antimalaria AS. Bentuk I merupakan bentuk komersial dari AS yang biasa digunakan sebagai bahan baku obat dan bentuk II diperoleh dari perlakuan bentuk I yang mengalami proses freeze drying. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6061 10.17146/jsmi.2014.15.2.4362 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 88-94 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6061/4482 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6062 2026-11-02T06:20:12Z jsmi:ART

Calculated Radioactivity Yields of Gallium-67 using Matlab Codes Imam Kambali Ga-67 Nuclear cross-section Proton bombardment Radioactivity yield TENDL 2017 In nuclear medicine, gallium-67 (67Ga) is potentially applied for imaging a certain type of tissue. In this investigation, 67Ga is theoretically studied in terms of its potential radioactivity yields at the end of various energetic proton bombardments.  Nuclear cross-sections derived from the Talys Evaluated Nuclear Data Library (TENDL) 2017 were used as the input files, while a Matlab code was developed to perform the yield calculations of 67Zn(p,n)67Ga and 68Zn(p,2n)67Ga nuclear reactions to produce 67Ga. Two different targets – enriched 67Zn and natZn targets – were simulated in the calculations. The calculated yields suggested that a maximum of 27.37 MBq/µAh could be achieved when enriched 67Zn target was irradiated with 15-MeV protons, whereas 46.99 MBq/µAh could be generated following a 30 MeV proton bombardment of enriched 68Zn target. Various radioactive gallium impurities, i.e. 63,64,65,66,68,70Ga and stable 69Ga isotope were also expected to be generated mostly via (p,n) and (p,2n) reactions when natZn target was used in the 67Ga production. In contrast, radioactive 66Ga and 68Ga impurities were mainly produced following bombardment of enriched 67Zn and 68Zn targets. This study can be used as a reference for future 67Ga radionuclide production. BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6062 10.17146/jsmi.2019.21.1.5679 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 21-26 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6062/4467 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6063 2026-10-30T09:14:47Z jsmi:ART

ANALISIS STRUKTUR KRISTAL LaMnO3 DENGAN TEKNIK DIFRAKSI SINAR-X DAN METODE RIETVELD Engkir Sukirman Wisnu Ari Adi Wisnu Ari Adi Wisnu Ari Adi Wisnu Ari Adi Yustinus Purwamargapratala Struktur kristal LaMnO3 Difraksi sinar-X Metode Rietveld ANALISIS STRUKTUR KRISTAL LaMnO3 DENGAN TEKNIK DIFRAKSI SINAR-X DAN METODE RIETVELD. Telah dilakukan analisis struktur kristal LaMnO3 dengan teknik difraksi sinar-X dan metode Rietveld. Cuplikan LaMnO3 disintesis dengan metode milling energi tinggi dari serbuk oksida La2O3 dan MnO2 dengan perbandingan mol yang tepat. Penggerusan dilakukan selama 10 jam, kemudian dipelet dan selanjutnya disinter pada 1.350 oC selama 6 jam. Karakterisasi cuplikan meliputi struktur kristal dan sifat listrik-magnetik bahan, berturut-turut dengan teknik difraksi sinar-X, metode analisis Rietveld dan probe empat titik. Hasil analisis Rietveld berdasarkan data difraksi sinar-X menunjukkan bahwa cuplikan adalah fasa tunggal LaMnO3,0 sistem kristal ortorombik, grup ruang Pnma No. 62 dengan parameter kisi a = 5,4405(9) Å, b = 7,717(1) Å dan c = 5,537(1) Å. Bahan memiliki respon Magnetic Resonance (MR) = 7 %, harga rata-rata ukuran kristalit, D = 17 nm dan regangan kisi, e = -0,5%. Bahan mengalami regangan tekan, dan berdasarkan model regangan Nanda, bahan LaMnO3,0 berperilaku sebagai bahan isolator, antiferromagnetik tipe G. Karena sifat isolator bahan tidak berubah walaupun dikenai medan magnet eksternal, maka respon MR hanya akibat keteraturan spin elektron. Oleh karena itu pada suhu kamar, LaMnO3,0 menampilkan respon MR yang kecil. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6063 10.17146/jsmi.2010.12.1.4586 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 70-74 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6063/4474 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6064 2026-11-02T06:20:12Z jsmi:ART

Isotherm, Thermodynamic, and Kinetics Studies of Iodide Adsorption on The Al_SBA-16 Mesoporous Nanomaterial as Radiopharmaceutical Vehicle Candidate Maria Christina Prihatiningsih Sri Sundari Retnoasih Athanasia Elra Andjioe Noor Anis Kundari Edy Giri Rachman Putra Mesoporous Nanomaterial radiopharmaceutical vehicle adsorption in vitro stability In order to investigate the potential of Al_SBA-16 Mesoporous Nanomaterial as a candidate for radiopharmaceutical vehicles, the studies of kinetics, thermodynamic, and in vitro stability of Iodide adsorption onto the nanomaterial have been carried out. The adsorption study was conducted at different temperature, time, and iodide concentration and observed with spectrophotometric techniques. The isotherm adsorption was fitted with Langmuir and Freundlich model and the thermodynamic parameters were determined at temperatures of 293K, 301K, 308K, and 313K. Moreover, the adsorption kinetics was analyzed in terms of pseudo first order model for Al_SBA-16 Mesoporous Nanomaterial and Iodide and pseudo second order in overall reaction. The activation energy was determined by using Arrhenius equation, meanwhile, the in vitro stability testing was conducted in phosphate buffer saline at pH variation for 5.5 to 7.0, and at temperature variation for 20C to 45C and at testing time variation for 6 to 48 hours. The result indicate that the adsorption obeys the Langmuir isotherm model and has a tendency to be chemical adsorption with a value of H was -116.641 kJ/mol and the nature of spontaneous reactions. The adsorption process followed the pseudo-first-order model and the apparent activation energy was 41.26 kJ/mol. In the present research work, the in vitro stability data were evaluated using P-Value and the theory of Hypothesis Testing or Fisher's significance test. The result of hypothesis testing show that, the adsorption of iodide onto Al_SBA-16 Mesoporous Nanomaterial were highly stable under the experimental conditions adopted. BRIN Publishing (Penerbit BRIN) 2026-11-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6064 10.17146/jsmi.2019.21.1.5798 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 27-34 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6064/4470 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6065 2026-11-02T06:20:12Z jsmi:ART

Microstructure of Oxide Dispersion Strengthened Steel With Cr Content Variation Marzuki Silalahi Bandriyana. B Dimyati. A Bambang. S Ahda. S Fitria. N ODS alloy zirconia Arc Plasma Sintering APS SEM XRD Microstructure and phase distribution of innovative Oxide Dispersion Strengthened (ODS) steel based on Fe-Cr-ZrO2 particularly for application at high temperature reactor with variation of Cr content was analysed. The alloy was synthesized with Cr composition variation of  15, 20 and 25 wt.% Cr, while zirconia dispersoid kept constant at 0.50 wt.%. The samples was synthesized by mechanical alloying comprising of high energy milling for 3 hours followed by vibrated compression with iso-static load at 20 ton. The final consolidation was performed via sintering process for 4 minutes using the Arc Plasma Sintering (APS) technique, a new method developed in BATAN especially for synthesizing high temperature materials. The samples were then characterized by means of scanning electron microscopy (SEM) with energy dispersed X-ray (EDX) analysis capability and X-ray diffraction. The mechanical property of hardness was measured using standard Vickers micro hardness tester to confirmed the microstructure analysis.  The results show that the microstructure of the ODS alloy samples in all variation of Cr content consists generally of cubic Fe-Cr matrix phase with small of porosity and  Zirconia particles distributed homogenously in and around the matrix grains. The achievable hardness was between 142 and 184 HVN dependent consistently on Cr content in which Cr element may cause grain refining that in turn increase the hardness. BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6065 10.17146/jsmi.2019.21.1.5590 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 35-39 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6065/4472 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6066 2026-11-02T06:20:12Z jsmi:ART

ELECTROCHEMISTRY STUDY ON THE RELATIONSHIP BETWEEN GRAIN BOUNDARY STATE AND CORROSION BEHAVIOR OF ULTRAFINE GRAINED IRON CHROMIUM ALLOY A D Prasetya M Rifai A H As’ari Mujamilah H Miyamoto pitting corrosion stainless steel ECAP ultrafine grain ELECTROCHEMISTRY STUDY ON THE RELATIONSHIP BETWEEN GRAIN BOUNDARY STATE AND CORROSION BEHAVIOR OF ULTRAFINE GRAINED IRON CHROMIUM ALLOY. Research on stainless steel corrosion resistance continues to grow today. This reality cannot be separated from the needs of stainless steels in various fields, one of which is bio-implant. In this research, the effect of grain size on the corrosion behavior of iron-chromium (Fe-Cr) alloy was investigated. Coarse grain Fe-Cr alloy was first processed with equal channel angular pressing (ECAP) for eight cycles to obtain ultrafine grain structure. The coarse and ultrafine grain samples then were then tested using XRD, SEM-EBSD, and the pitting corrosion properties tested using potentiodynamic polarization method in NaCl 1 M solution. The result of XRD dan SEM-EBSD shows that the initial sample is truly has a coarse grain structure, while ECAP produces an ultrafine grain structure. Corrosion test results showed that the ultrafine grain sample had better pitting corrosion resistance compared to the coarse grain sample. This behavior is related to the rate of passivation that depends on non-equilibrium grain boundaries, which can be easily observed in the ultrafine grain structure. Based on these results, it can be concluded that the ultrafine grain Fe-Cr alloy has a better corrosion resistance compared to the coarse grain. BRIN Publishing (Penerbit BRIN) 2019-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6066 10.17146/jsmi.2019.21.1.5640 Jurnal Sains Materi Indonesia; Vol. 21 No. 1 (2019): Jurnal Sains dan Materi Indonesia; 40-46 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6066/4473 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6068 2026-10-30T09:14:47Z jsmi:ART

MICRO AND CRYSTAL STRUCTURE ANALYSIS OF NEW AUSTENITIC STEEL. Nurdin Effendi New Austenitic Analysis Microstructure Crystal structure MICRO AND CRYSTAL STRUCTURE ANALYSIS OF NEW AUSTENITIC STEEL. New austenitic stainless steel code-named A1 has been synthesized using the foundry method. The steel was prepared from the crude minerals mined in Indonesia consisting of ferro scrap, ferro chrome, ferro mangan, and ferro silicon; all of them were in the granular shape. Moreover, a small quantity of titanium was added to this austenitic steel that already has a very low carbon content. The synthesis was started by calculating each raw material quantity from the given specification data with the material balance equation, so that the austenitic composition specification matches the originally conceived specifications. After all of the crude material quantities were determined, each of the crude materials to be used in the alloying process were then weighed separately. The process was continued by inserting the crude materials into an induction foundry furnace that operates on an electromagnetic inducto-thermo system. The stirring was carried out automatically by the system. The now homogenous melting materials were then inserted into the ladle, followed by pouring into the sand casting. Some of the steels was normalized by a homogenization process at 1200 oC for 20 hours, and additional characterization was carried out afterwards. The microstructure observation shows that the material surface is relatively homogenous but with some porous holes. The X-ray diffraction pattern shows that the material had a fcc crystal structure with lattice parameter of 3.564 Å. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6068 10.17146/jsmi.2010.12.1.4587 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 75-80 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6068/4475 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6069 2026-10-30T09:14:47Z jsmi:ART

DEGRADASI FOTOKATALISIS LIMBAH FENOL DENGAN KOMPOSIT TiO2 -PRECIPITATED CALCIUM CARBONATE Slamet Rahyani Ermawati Emmy Ratnawati Siti Naimah Adsorpsi Fotokatalisis Fenol Precipitated Calcium Carbonate (PCC) TiO2 DEGRADASI FOTOKATALISIS LIMBAH FENOL DENGAN KOMPOSIT TiO2-PRECIPITATED CALCIUM CARBONATE. Degradasi limbah fenol dengan proses fotokatalisis menggunakan nanokomposit TiO2-Precipitated Calcium Carbonate (PCC) telah dilakukan dalam sistem foto reaktor batch yang dilengkapi dengan sejumlah lampu ultra violet. Nanokomposit TiO2-PCC disintesis dari nanopartikel TiO2 komersial (Degussa P25) dan PCC lokal (Padang dan Yogyakarta). Masing-masing PCC dikombinasikan dengan TiO2 dengan variasi komposisi rasio berat TiO2:PCC sebesar 0:100, 10:90, 80:20 dan 100:0. Nanokomposit TiO2-PCC kemudian dikarakterisasi dengan X-Ray Diffractometer (XRD), (PSA) dan Scanning Electron Microscope (SEM).Hasil karakterisasi menunjukkan bahwa PCC vaterite memiliki kinerja yang paling optimal diantara jenis PCC lainnya. Dalam komposit TiO2-PCC, peran PCC lebih dominan sebagai penyangga, bukan adsorben. PCC saja tidak mampu menurunkan konsentrasi limbah fenol, namun kinerjanya meningkat tajam dengan penambahan sedikit TiO2. Nanokomposit 10% TiO2-PCC vaterite dapat mendegradasi secara sempurna larutan 10 ppm fenol dalam waktu sekitar 80 menit. Penggunaan PCC sebagai penyangga TiO2 juga memiliki nilai lebih dalam hal separasi katalis dari sistem limbah cair di akhir reaksi, karena TiO2-PCC cenderung mudah membentuk endapan sehingga proses pemisahan katalis lebih mudah dilakukan. BRIN Publishing (Penerbit BRIN) 2010-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6069 10.17146/jsmi.2010.12.1.4537 Jurnal Sains Materi Indonesia; Vol. 12 No. 1 (2010): Jurnal Sains dan Materi Indonesia; 1-6 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6069/4476 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6070 2026-11-02T05:55:13Z jsmi:ART

CORROSION BEHAVIOR OF Zr-10Mo ALLOYS IN NIOBIUM-DOPED LACTATE RINGER’S SOLUTION Vita Yuliana Prastika Pradoto Ambardi Djoko Hadi Prajitno Niobium Paduan Zr-10Mo Kekerasan Ketahanan Korosi Ringer Laktat This research discusses the corrosion behavior of Zr-10Mo alloys in Niobium-doped lactate ringer ’s solution. The addition of Niobium of 1%, 3% and 5% on Zr-10Mo alloys aims to study the effect of adding Niobium to the hardness, microstructure and corrosion resistance of Zr-Mo alloys. The alloys are made by melting the materials of Zr, Mo and Nb with a certain percentage of weight using single arc melting furnace in Argon atmosphere with high purity and Tungsten eletrodes. The alloys (as cast) are subjected to hardness testing using C-scale rockwell, microstructure using optical microscopy, compounds and phases in the alloys (as cast) using XRD and corrosion testing using polarization method in lactate ringers’ solution. The hardness value increases by the addition of Niobium, Zr-10Mo-1Nb alloy of 34 HRC, Zr-10Mo-3Nb alloy of 38 HRC and Zr-10Mo-5Nb alloy of 41.5 HRC. The basketweave-shaped microstructure with the addition of Niobium creates relatively smaller grain size. The value of corrosion rate decrases by the addition of Niobium at the immersion times of 0 minute, 60 minutes and 120 minutes, Zr-10Mo-1Nb alloy of 4.208 mpy, Zr-10Mo-3Nb alloy of 3.538 mpy and Zr-10Mo-5Nb alloy of 2.813 mpy, included in the excellent category (1-5 mpy). BRIN Publishing (Penerbit BRIN) 2026-11-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6070 10.17146/jsmi.2019.20.4.4627 Jurnal Sains Materi Indonesia; Vol. 20 No. 4 (2019): Jurnal Sains dan Materi Indonesia; 137-143 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6070/4478 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6071 2026-10-30T04:38:21Z jsmi:ART

UJI KINERJA MEMBRAN ULTRAFILTRASI DENGAN BOVINE SERUM ALBUMIN SEBAGAI LARUTAN UMPAN SyahrilAhmad Membran Ultrafiltrasi Bovine Serum Albumin Larutan umpan Fluks Koefisien rejeksi UJI KINERJA MEMBRAN ULTRA FILTRASI DENGAN BOVINE SERUM ALBUMIN SEBAGAI LARUTAN UMPAN. Larutan Bovine Serum Albumin (BSA) pada berbagai suhu, pH, laju alir sirkulasi dan tekanan operasi telah dipakai sebagai larutan umpan dalam rangka mempelajari kinerja membran ultrafiltrasi polisulfon. Membran polisulfon yang dipakai adalah membran serat berongga yang mempunyai Molecular Weight Cut Off (MWCO) sebesar 60 kDa. Pengamatan difokuskan pada parameter fluks dan koefisien rejeksi membran yang diamati dari harga protein yang lolos dan tertahan oleh membran selama proses berlangsung. Hasil percobaan memperlihatkan bahwa suhu, pH larutan umpan BSA, laju alir sirkulasi dan tekanan operasi dapat mempengaruhi kinerja membran dilihat dari segi fluks dan koefisien rejeksimembran. Suhu larutan umpan yang tinggi akan menurunkan fluks membran tetapi menaikkan koefisien rejeksi membran. Koefisien rejeksi membran semakin besar dan fluks semakin kecil pada pH larutan mendekati titik isoelektris protein. Tekanan larutan umpan yang tinggi akan menaikkan fluks membran tetapi menurunkan koefisien rejeksi membran. Koefisien rejeksi membran semakin kecil dan fluks semakin besar pada kecepatan aliran sirkulasi yang rendah BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6071 10.17146/jsmi.2009.11.1.4541 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 6-9 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6071/4477 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6072 2026-10-30T04:38:21Z jsmi:ART

PENAMBAHAN LATEKS KARET ALAM KOPOLIMER RADIASI DAN PENINGKATAN INDEKS VISKOSITAS MINYAK PELUMAS SINTETIS OLAHAN Meri Suhartini Rahmawati Rahmawati Rahmawati Lateks karet alam MetilMetakrilat Kopolimer radiasi Minyak pelumas sintetis olahan Indeks Viskositas PENAMBAHAN LATEKS KARET ALAM KOPOLIMER RADIASI DAN PENINGKATANINDEKS VISKOSITASMINYAK PELUMAS SINTETIS OLAHAN. Pada penelitian ini, minyak pelumas sintetis hasil olahan (recovery) dan minyak pelumas mineral diberi aditif lateks karet alam-metil metakrilat kopolimer radiasi (kopolimer LKA-MMA) yang telah dibuat larutan dengan konsentrasi bervariasi yaitu 0,25%, 0,70%, 1%, 3%, 5%, 7%, 10%. Hasil analisis indeks viskositas dan viskositas kinematik dibandingkan dengan minyak pelumas komersial yang beredar. Hasil menunjukkan bahwa indeks viskositas minyak pelumas sintetis olahan meningkat lebih dari 50% dengan pemberian 0,25% kopolimer LKA-MMA. Pada konsentrasi penambahan yang sama minyak pelumas mineral HVI 60 meningkat 11%. Pour point minyak pelumas sintetis olahan danmineral bernilai kurang dariminus 36 yang berartimemenuhi standar Society of Automotive Engineers(SAE). Selain itu angka basa total pada minyak pelumas tersebut meningkat dengan signifikan setelah diberi kopolimer LKA-MMA BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6072 10.17146/jsmi.2009.11.1.4542 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 10-14 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6072/4492 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6079 2026-11-02T01:48:57Z jsmi:ART

KELARUTAN DAN STABILITAS KIMIA KOMPLEKS DIDANOSIN DENGAN NIKOTINAMID ATAU L-ARGININ Fikri Alatas Sundani N. Soewandhi Lucy Sasongko Ismunandar DDI Nikotinamid L-arginin Kelarutan Stabilitas kimia KELARUTAN DAN STABILITAS KIMIA KOMPLEKS DIDANOSIN DENGAN NIKOTINAMID ATAU L-ARGININ. Didanosin (DDI) adalah obat anti HIV yang bekerja dengan menghambat enzim reverse transkriptase yang bertanggung jawab dalam replikasi virus HIV. Ketersediaan hayati DDI pada pemberian secara oral sangat buruk akibatterhidrolisis dalam suasana asam. Penelitian ini bertujuan untuk mengetahui pengaruh pembentukan kompleks antara DDI dengan NKT atau ARG terhadap kelarutan dan stabilitas kimia DDI. Kompleks DDI-NKT dibuat dengan metode slurry menggunakan pelarut campuran etanol:air (7:3), sedangkan kompleks DDI-ARG dibuat dengan metode penguapan pelarut menggunakan pelarut yang sama. Karakterisasi kompleks DDI-NKT dan DDI-ARG meliputi, analisis dengan mikroskop polarisasi, difraksi sinar-X serbuk, uji kelarutan, dan stabilitas kimia pada larutan dapar pH 1,2; 4,5 dan 6,8 di suhu 37 °C.Karakterisasi dengan mikroskop polarisasi dan difraksi sinar-X serbuk menunjukkan terbentuknya kompleks DDI-NKT dan DDI-ARG. Kelarutan kompleks DDI-ARG dan DDI-NKT dalam air berturut-turut 1,86 dan 4,54 kali lipat dari kelarutan DDI murni. Hasil uji stabilitas kimia menunjukkan larutan kompleks DDI-NKT dan DDI-ARG mengalami degradasi lebih lambat daripada DDI murni pada pH 1,2; 4,5; dan 6,8 di suhu 37°C. Hubungan linier antara pH terhadap logaritma tetapan laju degradasi (log kobs) menunjukkan, bahwa degradasi kompleks DDI-NKT, DDI-ARG, dan DDI pada pH 1,2 hingga 6,8 dikatalisis oleh asam spesifik. Hasil penelitian dapat disimpulkan, bahwa pembentukan kompleks DDI-NKT dan DDI-ARG dapat meningkatkan kelarutan dan stabilitas kimia DDI. BRIN Publishing (Penerbit BRIN) 2014-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6079 10.17146/jsmi.2014.15.2.4363 Jurnal Sains Materi Indonesia; Vol. 15 No. 2 (2014): Jurnal Sains dan Materi Indonesia; 94-102 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6079/4483 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6080 2026-10-30T03:21:27Z jsmi:ART

PREPARASI DAN KARAKTERISASI MATERIAL KERAMIK BARIUM TITANAT (BaTiO3 ) DENGAN METODE PERTUMBUHAN BUTIR TERORIENTASI UNTUK APLIKASI PIEZOELEKTRIK Bambang Sunendar Rudy Octavius Sihombing BaTiO3 Piezoelektrik Dielektrik Templated Grain Growth Keramik piezoelektrik tekstur polikristalin telah berhasil ditumbuhkan dengan metode Pertumbuhan Butir Terorientasi (Templated Grain Growth - TGG). Sejumlah fraksi partikel template anisotropik diorientasikanpada partikel matriks yang ukuran butirnya lebih kecil dengan proses tape casting dan terjadi pertumbuhanbutir seiring dengan perlakuan panas, dimana butir matriks tumbuh disekeliling partikel template pada orientasi tertentu. Matriks BaTiO3 skala submikron berhasil disintesis dengan metode konvensional pencampuran oksida BaCO3 dan TiO2. Sedangkan material template BaTiO3 dengan rasio H ≈ 5 : 1 diperoleh dengan metode hidrotermal pencampuran larutan Ba(OH2 dan TiO2 pada pH 13-14. Proses tape casting dilakukan dengan perbandingan % berat matriks : template = 7 : 3. Analisis semikualitatif SEM mengamati fraksi kristal tekstur yang meningkat seiring dengan kenaikan suhu dan terjadi mekanisme exagerated grain growth pada suhu 1200 oC. Konstanta dielektrik juga cenderung meningkat seiring dengan kenaikan suhu dan penelitian inimerupakan studi awal preparasi keramik tekstur piezoelektrik. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6080 10.17146/jsmi.2008.9.2.4732 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 99 - 104 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6080/4484 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6081 2026-10-30T03:21:27Z jsmi:ART

PENGARUH KONSENTRASI AgI TERHADAP SIFAT TERMAL DAN KONDUKTIVITAS ELEKTROLIT PADAT (AgI)x (β-Al2O3)1-x (x = 0,3 dan x = 0,5). P. Purwanto S. Purnama Elektrolit Difraksi sinar-X Konduktivitas Sifat termal Elektrolit padat (AgI)x (β-Al2O3)1-x (x = 0,3 dan x = 0,5) telah dibuat dengan mencampurkan AgI dan β-Al2O3 dengan perbandingan fraksi berat tertentu, dibuat pelet pada tekanan 48,26 x 106 N/m2 dengan diameter 1,5 cm, dilanjutkan dengan perlakuan panas pada suhu 300 oC selama 5 jam. Puncak-puncak difraksi sinar-X pada elektrolit padat (AgI)x (β-Al2O3)1-x memperlihatkan bahwa puncak yang muncul adalah puncak AgI, sedangkan puncak β-Al2O3 tidak tampak. Regangan kisi (AgI)x (β-Al2O3)1-x lebih tinggi dibandingkan β-Al2O3, dan nilainya meningkat terhadap pertambahan konsentrasi AgI. Konduktivitas (AgI)x (β-Al2O3)1-x pada fraksi berat x = 0,3 tidak berbeda dengan konduktivitas AgI, sedangkan pada x = 0,5 konduktivitasnya naik. Termogram DTA untuk (AgI)x (β-Al2O3)1-x, memperlihatkan suatu proses endotermis pada suhu transisi fasa-β ke α dan titik leleh serta nilai entalpinya mengalami perubahan dengan ditambahkan konsentrasi AgI. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6081 10.17146/jsmi.2008.9.2.4733 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 105 - 109 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6081/4485 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6082 2026-10-30T03:21:27Z jsmi:ART

SnO2 THIN FILM DEPOSITION FOR N-TYPE AND WINDOW OF CIS SOLAR CELL Sri Sulamdari Yunanto Thin film Sputtering CIS solar cell SnO2 thin film deposition on glass substrate has been carried out using DC sputtering technique. This research has purpose to find the three sputtering parameters such as deposition time, pressure of Ar gas and substrate temperature. By controlling these parameters, it is expected that the SnO2 thin film has low resistivity and high transmittance which can be used for the CIS solar cell. Ar ion bombarded on SnO2 target, placed on the vacuum chamber, hence the sputtered SnO2 target atom forms the SnO2 thin film on glass substrate. The resistivity and conduction type were measured using four point probe, the transmittance by UV-Vis and the crystal structure by XRD. The microstructure and thickness were observed using SEM, while the chemical composition using EDS. The results show that the lowest resistivity with N conduction type is 5 x 10-2 ohm.cm, the highest transmittance is 83.59 % at λ = 600 nm, the grains are distributed homogeneously, the thickness of thin film is 1 μm, the crystal structure of SnO2 thin film is tetragonal while composition of thin film consists of 38.42 % Sn atom, 60.96 % O atom, and 2.61 % Fe atom. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6082 10.17146/jsmi.2008.9.2.4734 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 110 - 114 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6082/4486 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6083 2026-10-30T03:21:27Z jsmi:ART

EFFECTS OF Ti ADDITION ON THE DIELECTRICAL PROPERTIES OF A NEW AUSTENITE ALLOY Aziz K. Jahja Nurdin Effendi Austenite alloys Novel materials Dielectric properties Preparation of alloys has been carried out leading to a new type of austenite alloys designated A-1 with a composition of Fe 52.22 wt%, Ni 24.2 wt%, Cr 20.0 wt%, Si 1.0 wt%, Mn 2.0 wt%, C 0.08 wt% and Ti 0.5 wt%. The main difference compared to commercial alloys (e.g. A347) is that Ti is added as an alloying element, but no P and S. The frequency-dependent conductivity and dielectric response of this novel material have been investigated by RLC bridge impedance spectroscopy method. It was verified that the real dielectric constant κ' of these newA-1materials showawell defined dielectric behavior and shows a considerable improvement over the commercial A-347 alloywith similar composition. Both dielectric response and dielectric loss curves show frequency dispersive relaxation peaks, indicating different conduction process in the surface and in the bulk of the materials. Therefore the substitution of P and S with Ti resulting in a new austenite with different dielectric properties. These improved dielectric properties should make this new material a good candidate for use as electrical connector, but with a reduced corrosion, so the lifetime or duration of application could be extended. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6083 10.17146/jsmi.2008.9.2.4735 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 115 - 120 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6083/4487 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6084 2026-10-30T03:21:27Z jsmi:ART

SIFAT MEKANIK PERMUKAAN BAHAN AISI H-13 AKIBAT PROSES NITRIDASI Elman Panjaitan AISI H – 13 Nitridasi Sifat mekanik Telah dilakukan penelitian sifat mekanik permukaan bahan AISI H-13 sebagai akibat proses nitridasi pada suhu 525 oC dan 550 oC dengan laju aliran gas NH3 sebesar 4,5 L/menit selama 6 jam. Pengamatan sampel ternitridasi meliputi volume terabrasi dari permukaan sampel, uji kekerasan makro dan mikro menggunakan metode Vickers, perilaku mikrostruktur menggunakan mikroskop optik dan pembentukan fasa menggunakan difraksi sinar–X. Hasil penelitian menunjukan bahwa ketahanan aus dan kekerasan bahan ternitridasi meningkat. Volume abrasi terendah mencapai 0,0396mm3 sedangkan kekerasan permukaan meningkat hingga 402,92 HVN. Peningkatan ini dianalisis disebabkan oleh terbentuknya lapisan fasa F3N pada permukaan AISI H-13 dengan ketebalan sebesar 130 μm. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6084 10.17146/jsmi.2008.9.2.4736 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 121 - 124 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6084/4488 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6085 2026-10-30T03:21:27Z jsmi:ART

ANALISIS STRUKTUR KRISTAL Mg2Ni HASIL MECHANICAL ALLOYING Wisnu Ari Adi Andon Insani Hadi Suwarno Hidrida logam Mg2Ni Struktur kristal Telah dilakukan analisis struktur kristal pada paduan Mg2Ni hasil sintesis dengan menggunakan mechanical alloying. Bahan ini dimilling dengan variasi waktu milling selama 20 jam, 25 jam, 30 jam, dan 35 jam. Hasil pengukuran dengan difraksi sinar-X (XRD) menunjukkan bahwa hasil refinement dari pola difraksi sinar-X sangat baik dan profil terdiri dari 3 fasa yaitu :Mg2Ni,MgO dan MgNi2. Kerapatan atomyang paling rendah dan volume unit sel yang paling tinggi diperoleh setelah milling selama 25 jam. Jarak antar atom baik Mg(1)-Mg(1), Mg(2)-Mg(2), Ni(1)-Ni(1) dan Mg(1)-Ni(2) yang paling panjang didapatkan setelah milling 25 jam. Ukuran diameter grain/kristalit pada fasa Mg2Ni hampir tidak berubah dengan semakin bertambahnya waktu milling sekitar 20 nm. Dengan demikian dapat disimpulkan bahwa setelah milling 25 jam diperoleh hasil yang paling optimum pada penelitian ini dimana fasa Mg2Ni memiliki ruang yang paling besar sehingga diharapkan dapat memudahkan atom-atom hidrogen masuk dalam jumlah yang banyak untuk berikatan membentuk paduan hidridanya. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6085 10.17146/jsmi.2008.9.2.4737 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 125 - 130 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6085/4490 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6086 2026-10-30T03:21:27Z jsmi:ART

AC IMPEDANCE ANALYSIS OF CuS-C COMPOSITE SUPERIONIC CONDUCTOR Safei Purnama A. K. Jahja Composite superionic conductor Impedance analysis Hopping ionic conductivity Hopping mechanism CuS-C composite superionic conductor has been synthesized by powder metallurgy method. The frequency response of frequency dependent conductivity has been measured by AC complex impedance bridge methods at room temperature, 100 oC and 200 oC. The AC conductivity of superionic materials takes the form σ=σ(0)+Aωn. The carrier hopping rate ωp is obtained from the new expression σ(0)=Aωpn. The conductivity data is analyzed, to obtain the ionic conductivity parameters and hopping rates of CuS-C composite superionic conductor. Arrhenius plot of the conductivity shows a smooth slope change or transition at 323 K or 50 oC and the activation energy for conduction is found to be 0.154 eV. The experimental data for all temperatures shows a clear anomaly at frequencies of 9.0 kHz and higher. For frequencies from 0.1 Hz to up to 9.0 kHz the curve is mainly flat and practically no frequency dispersion at all temperatures is observed. The estimated DC conductivity is 0.5708 Scm-1. The ionic parameters such as prefactorA, exponential power n and hopping frequency ωp are in fact temperature dependent and this is a strong indication that hopping mechanism is the predominant mode of ionic conduction in CuS-C composite. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6086 10.17146/jsmi.2008.9.2.4738 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 131 - 134 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6086/4491 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6087 2026-10-30T03:21:27Z jsmi:ART

PENYERAPAN Pb OLEH NANO KOMPOSIT OKSIDA BESI BENTONIT Siti Wardiyati Adel Fisli Penyerapan Pb Nano komposit Bentonit Oksida besi Telah dilakukan penelitian penyerapan Pb oleh nano komposit oksida besi bentonit. Bahan penyerap seperti resin penukar ion atau zeolit telah lazim digunakan untuk pemurnian air, demikian pula bentonit. Namun bentonit ini mempunyai ukuran yang sangat kecil dan bersifat suspensi stabil di dalam air sehingga sulit dikumpulkan kembali setelah proses penyerapan. Berdasarkan alasan tersebut bentonit dikompositkan dengan nano partikel oksida besi, untuk mempermudah proses pemisahan kembali bahan penyerap tersebut dari filtratnya menggunakan teknik pemisahan magnetik sederhana. Nano komposit oksida besi bentonit pada percobaan ini diaplikasikan untuk penyerapan Pb dalam media air. Penelitian dilakukan untuk mendapatkan komposisi komposit yang optimal untuk penyerapan Pb. Penentuan konsentrasi Pb2+ dalam filtrat dianalisis dengan alat polarografi. Dari analisis data menggunakan pendekatan Persamaan Langmuir diperoleh daya serap maksimum yang dapat dicapai adalah sebesar 176,34 mg Pb2+/gram oleh nano komposit yang dibuat dengan perbandingan Na-bentonit : oksida besi = 3 : 2. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6087 10.17146/jsmi.2008.9.2.4745 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 135 - 138 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6087/4493 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6088 2026-10-30T03:21:27Z jsmi:ART

STRUKTURMIKRO DAN SIFAT FISIK-MEKANIK BETON RINGAN TANPA PEMATANGAN DALAM AUTOCLAVE (NON AUTOCLAVED AERATED CONCRETE, NAAC) Sri Harjanto Prima Sony Bambang Suharno Henki W.Ashadi Beton busa Beton ringan Material seluler Senyawa pengaerasi NAAC Pembuatan beton ringan umumnya menekankan pada dua hal, yaitu massa jenis yang serendah mungkin dan kuat tekan yang setinggi-tingginya. Penelitian ini mengamati strukturmakro dan stukturmikro, sifat fisika-mekanika dan keterkaitannya satu sama lain. Dalam penelitian ini, beton ringan dibuat tanpa pematangan dalam autoclave (Non Autoclaved Aerated Concrete, NAAC) dengan penambahan senyawa pengaerasi Al (2 % massa) dan H2O2 (32 % massa) secara terpisah. Alkalinitas campuran beton ringan ini dikontrol dengan penambahan kapur sampai jumlah tertentu. Diperoleh hasil massa jenis beton ringan NAAC dengan senyawa pengaerasi Al dan H2O2 masing-masing adalah 1126 kg/m3 dan 1163 kg/m3. Sedangkan kuat tekan yang dihasilkan dari beton ringan dengan senyawa pengaerasi Al dan H2O2 masing-masing adalah 2,74 MPa dan 3,48 MPa. Massa jenis beton ringan NAAC masih lebih tinggi, sedangkan kuat tekannya relatif lebih rendah dibanding beton ringan dengan pematangan dalam autoclave (Autoclaved Aerated Concrete, AAC). Hasil penelitian ini juga mengindikasikan pengaruh pori terhadap massa jenis dan fasa strukturmikro dengan kuat tekan. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6088 10.17146/jsmi.2008.9.2.4746 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 139 - 144 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6088/4494 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6089 2026-10-30T03:21:27Z jsmi:ART

PENGARUH SUHU PEMBUATAN NANO KOMPOSIT OKSIDA BESI BENTONIT Adel Fisli Dian Hamsah Siti Wardiyati Ridwan Bentonit Oksida besi Nano komposit Sifat magetik Luas permukaan BET Telah dilakukan proses pembuatan nano komposit oksida besibentonit pada suhu ruang dan suhu 70 oC. Pembuatan dilakukan dengan proses pertukaran kation dan presipitasi ion Fe2+/Fe3+ dalam suasana basa NaOH dalam struktur bentonit. Nano komposit yang terbentuk selanjutnya dianalisa fasanya dengan metode difraksi sinar-X dan sifatmagnetnya dengan fasilitas Vibrating Sample Magnetometer (VSM). Hasil analisismenunjukkan terbentuknya okida besi dengan dengan fasa magnetik Fe3O4/γ-Fe2O3 dengan karakterisitik magnetik yang meningkat untuk nano komposit yang dibuat pada suhu 70 oC dibanding pada suhu ruang. Luas permukaan spesifik BET dan volume pori nano komposit meningkat akibat pengkompositan maupun akibat peningkatan suhu. Peningkatan luas permukaan dan volume pori untuk nano komposit 70 oC mencapai masing-masing 66,5% dan 91% dibanding bentonit murni. Peningkatan ini disimpulkan disebabkan oleh makin sempurnanya pembentukan dan penempatan oksida besi pada ruang antara lembaran dan permukaan lembaran bentonit dengan makin meningkatnya suhu pembuatan. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6089 10.17146/jsmi.2008.9.2.4748 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 145 - 149 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6089/4495 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6091 2026-10-30T04:38:21Z jsmi:ART

SINTESIS HIDROGEL SUPERABSORBENT POLI(AKRILAMIDA-KO-ASAMAKRILAT) DENGAN TEKNIK IRADIASI DAN KARAKTERISASINYA Erizal Anik Sunarni Asam akrilat Iradiasi Akrilamida Superabsorbent SINTESIS HIDROGEL SUPERABSORBENT POLI (AKRILAMIDA-KO-ASAM AKRILAT)DENGANTEKNIKIRADIASIDANKARAKTERISASINYA. Satu seri hidrogel superabsorbent telah berhasil disintesis menggunakan teknik iradiasi sinar gamma pada suhu kamar dari akrilamida (AAM) dan asamakrilat (AA) yang tidak dinetralisir parsial dengan NaOH. Kopolimerisasi dari hidrogel dikarakterisasi dengan Fourier Transform Infra Red (FT-IR) Spectroscopy. Pengaruh dosis iradiasi dan konsentrasi asam akrilat terhadap fraksi gel, kinetika swelling dan nilai rasio swelling maksimum(EDS) dipelajari. Larutan AAM–AA dengan konsentrasi AA yang bervariasi 0,25% hingga 1% dipapari iradiasi sinar gamma pada dosis 20 kGy hingga 40 kGy. Hasil evaluasi menunjukkan bahwa fraksi gel ~ 100% serta EDS ~350 g/g diperoleh dari radiolisis larutan AAM-AA akibat sinar gamma pada kondisi optimal sintesis hidrogel (dosis 20 kGy dan konsentrasi AA 0,75 %). Sifat swelling dalam NaCl, dan perubahan suhu diinvestigasi. Hidrogel poli (AAM-ko-AA) peka terhadap perubahan kekuatan ionik media dan suhu. hidrogel poli(AAM-ko-AA) selayaknya sebagai kandidat bahan biomaterial, matriks pelepasan obat dan penyimpan air di bidang hortikultura BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6091 10.17146/jsmi.2009.11.1.4543 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 15-21 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6091/4498 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6092 2026-10-30T03:21:27Z jsmi:ART

FIRE RESISTANCE MEASUREMENT OF OIL PALM EMPTY FRUIT BUNCH-PLASTIC COMPOSITES BY COMBUSTIBILITY TEST Wahyu Dwianto Myrtha Karina Combustibility test Empty fruit bunch Composite Temperature gradient Weight loss This paper reports combustibility test of Oil Palm empty fruit bunch (EFB)-plastic composites to determine their fire resistance. Specimens were of several composite types with dimension of 40 x 40 x 50 mm3. Combustibility test was done according to JIS A 1321-1975 by using small scale cylindrical furnace. Initial temperature of furnace was set at 750 ºC ± 1 ºC. Based on JISA1321-1975, all the composites tested were classified into combustible materials due to their temperature gradient higher than 50 ºC. The lowest temperature gradient was attained at 75 ºC for PE-EFB/GF/GF short fibers composite. However, the result showed that the temperature gradient of PE-EFB/GF/GF short fibers composite was lower compared to some solid woods and commercial wood-based panels. Weight loss has a strong relationships with density of the composites, shown by polynomial equation y = -181.82 x2 + 452.36 x - 205.5, R2 = 0.9156. The density of composites which formed EFB layers tended to decrease, conscequently increased their weight loss. Concerning the both factors, PE-EFB/GF/GF short fibers composite was recommended as the best fire resistance among the tested composites due to its lowest temperature gradient (75 ºC) and relatively lower weight loss (64.17 %). BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6092 10.17146/jsmi.2008.9.2.4749 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 150 - 155 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6092/4496 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6093 2026-10-30T03:21:27Z jsmi:ART

PENGARUH PENAMBAHAN LIQUID NATURAL RUBBER PADA POLYBLENDELASTOMER TERMOPLASTIK-POLIPROPILEN Deswita Sudirman Aloma Karo Karo Indra Gunawan Termoplastik Elastomer Polipropilen LNR Blending Telah dilaksanakan penelitian pengaruh penambahan Liquid Natural Rubber (LNR) pada polyblend Elastomer Thermoplastik (ETP) - Polipropilen (PP) yang bertujuan untuk mendapatkan ETP yang unggul yang dapat diterima oleh kalangan Industri, khususnya industri automotive. Metode yang digunakan adalah metode blending yang dilakukan pada sekitar suhu leleh dari PP yaitu 180 oC. ETP yang digunakan berbasis karet alam yang dicampur dengan monomer metil metakrilat melalui teknik radiasi sinar gamma. Selanjutnya dilakukan pencampuran polyblend ETP-PP (70% berat PP) dengan variasi komposisi LNR 0% berat, 3% berat, 5% berat, dan 7% berat . Kemudian dilakukan karakterisasi meliputi densitas, sifat mekanik, sifat fisik dan strukturmikro. Hasil yang diperoleh menunjukkan densitas dari polyblend yang terbentuk semakin meningkat dengan penambahan LNR. Untuk uji mekanik hasil terbaik didapatkan pada penambahan LNR 3%berat, hal ini juga didukung data strukturmikro dimana pada penambahan LNR 3%berat ini pola yang dihasilkan lebih teratur (homogen) dan rigid. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6093 10.17146/jsmi.2008.9.2.4756 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 156 - 160 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6093/4497 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6094 2026-10-30T03:21:27Z jsmi:ART

PROSES FINISHING KAIN PAYUNG NYLON 66 MEMPERGUNAKAN RESIN FLUOROKARBON (WATER REPELLENT AGENT) DAN ESTER ASAM POLIAKRILAT (COATING AGENT) Kuntari Gde P.Astawa Kain payung nylon 66 Water repellent Coating Fluorokarbon Ester asam poliakrilat Untuk mendapatkan kualitas kain payung terbaik dan memenuhi syarat daya tolak air sesuai SNI 08-1517-89 dan American standard No L 22.30.13-1960, telah dilakukan percobaan proses finishing water repellent dengan variasi konsentrasi fluorokarbon 20 g/L hingga 35 g/L interval 5 g/L dan suhu curing (pemanas awetan) 150 oC hingga 210 oC interval 15 oC. Proses coating dilakukan dengan zat coating ester asam poliakrilat dengan metoda pencapan blok mempergunakan kasa pencapan, kemudian pengeringan pendahuluan pada suhu 100 oC selama 1 menit, dilanjutkan dengan pemanas awetan pada suhu 160 oC selama 1 menit. Percobaan dilakukan mempergunakan dua metode yaitu metode pertama kain diproses coating terlebih dahulu, kemudian diproses finishing water repellent dan metode kedua kain diproses finishing water repellent terlebih dahulu, setelah itu diproses coating. Pengujian dilakukan terhadap: daya tolak air, uji siram, uji tekanan hidrostatik, tahan hujan Bundesmann, sudut kembali dari lipatan, kekuatan tarik kain, kekakuan kain dan uji kenampakan kain setelah pencucian berulang. Dari hasil pengujian ternyata bahwa peningkatan konsentrasi resin fluorokarbon dan suhu curing menaikkan kekakuan kain, sudut kembali dari lipatan dan tahan hujan Bundesmann, tetapi menurunkan kekuatan tarik, serta tidak berpengaruh terhadap daya tahan air uji siram dan uji tekanan hidrostatik. Kondisi terbaik proses finishing water repellent diperoleh pada konsentrasi fluorokarbon 25 g/L dan suhu curing 165 oC. Dari kedua metode tersebut ternyata memenuhi standar dan hasil tolak air percobaan metode pertama lebih baik dari pada metode kedua. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6094 10.17146/jsmi.2008.9.2.4800 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 161 - 170 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6094/4499 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6096 2026-10-30T03:21:27Z jsmi:ART

SINTESIS MICROSPHERE POLILAKTAT BERISI HOLMIUM DI DALAM TANGKI BERPENGADUK Indra Gunawan Sudaryanto Deswita Wahyudianingsih Aloma K. K Microsphere Holmium Polilaktat Tangki berpengaduk Telah dilakukan sintesis microsphere polilaktat dan pengisian holmium ke dalam microsphere. Tujuan penelitian ini adalah eksplorasi variabel lain yang mungkin mempengaruhi pembentukan microsphere seperti tinggi pengaduk dan tinggi cairan dari dasar tangki. Hasil penelitian ini menunjukkan bahwa pembentukan microsphere yang dipengaruhi tinggi pengaduk dari dasar tangki mengikuti persamaan : ln (dm/dp) = 1,5154 - 0,1848 ln(z/dp) dengan kisaran z = 0,1dp hingga 0,5dp. Sedangkan pembentukanmicrosphere yang dipengaruhi tinggi cairan dari dasar tangki mengikuti hubungan : ln (dm/dp) = 1,7934 + 0,3123 ln (H/dp) dengan kisaran H = 0,75 dp hingga 1,25 dp. Kandungan Holmium yang diisikan di dalam microsphere polilaktat telah dihitung dari data difraksi sinar-X adalah 34 %. Aktivitas microsphere polilaktat berisi Holmium setelah irradiasi netron selama 1 jam di Reaktor Kartini PTAPB Yogyakarta adalah 36,5 MBq. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6096 10.17146/jsmi.2008.9.2.4768 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 171 - 174 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6096/4504 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6097 2026-10-30T03:21:27Z jsmi:ART

PENGARUH DOPANT TERHADAP KONDUKTIVITAS DAN STRUKTUR ELEKTRONIK POLI (HEKSIL TIOFEN) Fitrilawati Tuti Susilawati Vicka P. Lestari Yusi S. Syamsiar Lukman Nulhakim Anita Anggraeni Wildan Abdussalam Polimer terkonjugasi Poli(3-heksil tiofen) Dopant Struktur elektronik Poli(3-heksil tiofen) merupakan polimer terkonjugasi yang memiliki sifat optik dan listrik yang menarik dan memiliki potensi aplikasi sebagai bahan solar sel, fotodioda dan transistor organik. Untuk kepentingan aplikasi tersebut, diperlukan bahan polimer dengan tingkat konduksi listrik tertentu, yang besarnya dapat dikontrol melalui proses doping. Dalam penelitian ini dilakukan studi doping poli(3-heksil tiofen) dengan menggunakan dopant perklorat (HClO4) dan dianalisis pengaruhnya terhadap konduktivitas dan struktur elektronik bahan yang bersangkutan. Konduktivitas bahan yang diukur dengan teknik four line probe menunjukkan adanya peningkatan karena pengaruh dopant. Selain itu, hasil pengukuran dengan spektroskopi UV-Vis menunjukkan konsentrasi dopant mempengaruhi spektrum bahan poli(3-heksil tiofen). Konsentrasi dopant yang tinggi (lebih besar dari 0,25 M) menimbulkan puncak absorpsi baru pada panjang gelombang 750 nm, yang diinterpretasikan sebagai munculnya pita energi baru diantara band gap. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6097 10.17146/jsmi.2008.9.2.4769 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 175 - 179 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6097/4505 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6098 2026-10-30T03:21:27Z jsmi:ART

PERUBAHAN STRUKTURMIKRO KOMPOSIT POLIPROPILEN-CaCO3 AKIBAT PENAMBAHAN COUPLING AGENT 3-AMINOPROPIL TRIETOKSISILAN Ari Handayani Aloma K.K. Deswita Sudirman Komposit Coupling agent Strukturmikro Telah dilakukan studi pengaruh coupling agent 3-aminopropil trietoksisilan terhadap perubahan strukturmikro komposit PP-CaCO3 dengan metode mikroskopik menggunakan Scanning Electron Microscope (SEM). Untuk meningkatkan kompatibilitas antara PP dan CaCO3 pada komposit PP-CaCO3 ditambahkan coupling agent 3-aminopropil trietoksisilan dengan volume 5 mL, 10 mL dan 15 mL. Komposit PP-CaCO3 dibuat dengan metode blending pada labo plastomill dengan suhu 180 oC dan kecepatan rotasi 40 rpm selama 10 menit. Komposit yang diperoleh dikarakterisasi SEM untuk melihat homogenitas dan diuji sifat mekaniknya. Hasil yang diperoleh menunjukkan penambahan coupling agent 3-aminopropil trietoksisilan dapat meningkatkan kompatibilitas komposit PP-CaCO3 dan menaikkan nilai kekuatan tarik (188,48 kg/cm2 hingga 281,76 kg/cm2) serta kekerasan komposit PP-CaCO3 (95 HVN). Penambahan 5 mL coupling agent 3-aminopropil trietoksisilan memberikan hasil yang lebih baik dibanding 10 mL dan 15 mL baik dari nilai kekuatan tarik (281,76 kg/cm2) maupun distribusi CaCO3 dalam polipropilen yang lebih homogen. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6098 10.17146/jsmi.2008.9.2.4772 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 180 - 183 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6098/4507 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6099 2026-10-30T04:38:21Z jsmi:ART

POLIMER KOMPOSIT POLIMETILMETAKRILAT-STIREN AKRILONITRIL (PMMA-SAN)-ZnS SEBAGAI FILM PENDAR UNTUK PENCITRAAN PADA SINTILATOR Jadigia Ginting Polimer komposit PMMA-SAN ZnS Film dosimetri Sintilator POLIMER KOMPOSIT POLIMETILMETAKRILAT-STIREN AKRILO NITRIL(PMMA-SAN)- ZnS SEBAGAI FILM PENDAR UNTUK PENCITRAAN PADA SINTILATOR. Studi polimer komposit polimetilmetakrilat-stiren akrilonitril (PMMA-SAN)-ZnS dalam pembuatan bahan pendar untuk pencitraan pada sintilator telah dilakukan dengan pencampuran 20 g PMMA/7 g SAN dalam aseton dengan bahan pendaranorganik ZnS. Tujuan penelitian ini untuk mengkaji pemakaian film optis hitam-putih BWASA100 sebagai alat ukur paparan radiasi sinar-X. Film pendar dibuat dari larutan PMMA dan SAN, yang dicampur dengan ZnS dengan komposisi bervariasi yaitu 50 mg, 125 mg, 250 mg, 500 mg dan 1000 mg. Campuran larutan polimer ini kemudian dikeringkan pada suhu kamar dan membentuk film. Film selanjutnya dipotong sesuai ukuran film dosimeter. Kemudian film optis hitam-putih dimasukkan ke dalam amplop kedap cahaya yang di dalamnya diberi film pendar. Sampel bersama satu film dosimeter dan satu filmoptis kosong diiradiasi dengan sinar-X pada tegangan operasi 50 kVolt selama 1 detik. Film dan sampel diproses bersama di dalam developer(larutan pengembang) dan dikeringkan dalam suhu kamar. Setelah film kering, diukur densitas optisnya dengan menggunakan densitometer. Hasil pengukuran menunjukkan bahwa nilai densitas optis dari film pendar dengankomposisi ZnS 50mg, 125mg, 250 mg, 500mg dan 1000mg masing-masing adalah 2,17 , 2,24 , 2,18 , 2,19 dan 2,11. Sedangkan film dosimeter dan film optis hitam-putih tanpa zat pendar masing masing mempunyaidensitas optis sebesar 3,86 dan 0,99. Pengamatan dengan Scanning Electron Microscope (SEM) menunjukkan film pendar yang dihasilkan isotropik. Hasil dari penelitian ini adalah bahwa film pendar dapat menaikkandensitas optis sebesar dua kali dari film optis hitam-putih BW ASA 100, sehingga film ini dapat digunakan untuk film dosimeter. BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6099 10.17146/jsmi.2009.11.1.4545 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 22-25 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6099/4506 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6100 2026-10-30T03:21:27Z jsmi:ART

SISTEM ELECTRON SPIN RESONANCE(ESR)MENGGUNAKAN FREKUENSI DAN MEDAN MAGNET PULSA TINGGI Aripin ESR Magnet pulsa tinggi Frekuensi tinggi Suhu rendah Sistem Electron Spin Resonance (ESR) menggunakan frekuensi dan medan magnet pulsa tinggi telah dikontruksi. Sistem ini dilengkapi medan magnetik pulsa dengan intensitas maksimum sampai 35 T, sumber radiasi gyrotron dalam rentang frekuensi-frekuensi pengukuran yang lebar dan suhu pengukuran antara 4,2 K hingga 80 K. Pulsa mempunyai bentuk sinusoidal dengan durasi 2,5 ms. Kapabilitas sistem ESR didemontrasikan dengan pengukuran spektrum ESR dari kristal tunggal MnF2 pada suhu 4,2 K. Frekuensi gap medan nol ditentukan oleh analisis dari mode-mode resonansi garis spektrum. Nilai frekuensi gap hasil percobaan bersesuaian dengan nilai yang dihasilkan dari penelitian sebelumnya. Ini menunjukkan bahwa sistem ESR dapat digunakan untuk penelitian lebih lanjut dalambidang fisika material. BRIN Publishing (Penerbit BRIN) 2008-02-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6100 10.17146/jsmi.2008.9.2.4773 Jurnal Sains Materi Indonesia; Vol. 9 No. 2 (2008): Jurnal Sains dan Materi Indonesia; 184 - 187 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6100/4508 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6101 2026-10-30T04:38:21Z jsmi:ART

PROPOSED MODEL FOR GRAIN ALIGNMENT IN YBa2Cu3O7-x SUPERCONDUCTORS PREPARED BY MELT PROCESSING Aristianto M.M.B. Model Grain alignment Melt processing Capillary Sympathetic nucleation PROPOSED MODEL FOR GRAIN ALIGNMENTIN YBa2Cu3O7-x (123) SUPERCONDUCTORS PREPAREDBYMELTPROCESSING. Amodel for grain alignment in YBa2Cu3O7-x is proposed. The proposed model is based on experimental results that the grain alignment in coarse samples with average grain diameter of 57 μm is higher than that of fine samples with average grain diameter of 1.6 μm which were prepared bymelt processing. Other evidence, supported the proposed model, is the difference inmicrostructure of both samples, i.e. the grain in the fine samples tend to form domain-like structure, while in the coarse sample some large grain randomly oriented in the bulk and some grain aligned on the surface. The alignment of grain in coarse sample is due to capillary mechanism while in the fine samples the alignment could be due to capillary mechanism or sympathetic nucleation. BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6101 10.17146/jsmi.2009.11.1.4548 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 26-32 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6101/4509 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6106 2026-10-30T04:38:21Z jsmi:ART

SINTESIS NANOPARTIKEL FERIT UNTUK BAHAN PEMBUATAN MAGNET DOMAIN TUNGGAL DENGAN MECHANICAL ALLOYING Suryadi Budhy Kurniawan Hasbiyallah Hasbiyallah Agus S. W. Nurul T.R Stronsium Ferit Nanopartikel Milling Magnet domain tunggal SINTESIS NANOPARTIKEL FERIT DENGAN PROSES MILLING UNTUK BAHANPEMBUATAN MAGNET DOMAIN TUNGGAL. Studi sintesis nanopartikel ferit untuk bahan pembuatan magnet domain tunggal dengan menggunakan metode milling dari bahan scrap magnet telah dilakukan. Preparasi sampel dilakukan menggunakan disk mill yang dilanjutkan dengan menggunakan High Energy Ball mill (HEM-E3D) dengan waktu milling 5 jam, 10 jam dan 20 jam. Sampel tersebut selanjutnya dikarakterisasi menggunakan X-Ray Fluorescence (XRF), X-Ray Diffractometer (XRD) dan Scanning Electron Microscope (SEM). Hasil karakterisasi XRF yang dikonfirmasi dengan hasil analisis XRD menunjukkan bahwa sampel magnet adalah stronsium ferit. Hasil analisis struktur mikro memperlihatkan terjadinya proses penghalusan ukuran partikel ferit dengan bertambahnya waktu milling. Partikel berukuran nanometer berhasil diperoleh,meskipun distribusinya tidak homogen. Hasil karakterisasi sifat magnetik dari sampel hasil milling yang kemudian disintering menunjukkan peningkatan daerah kurva histeresis pada sampel dengan waktu milling yang lebih lama BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6106 10.17146/jsmi.2009.11.1.4550 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 33-37 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6106/4511 https://ejournal.brin.go.id/jsmi/article/view/6106/4512 https://ejournal.brin.go.id/jsmi/article/view/6106/4513 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6110 2026-11-02T01:05:22Z jsmi:ART

KONDUKTIVITAS IONIK KOMPOSIT ELEKTROLIT SAMARIUMTERDOPING CERIUM- (Li/Na)2CO3 UNTUK SOLID OXIDE FUEL CELL BERSUHU RENDAH Jarot Raharjo Konduktivitas ion SDC-(Li/Na)2CO3 Sintering tanpa tekanan LT SOFC KONDUKTIVITAS IONIK KOMPOSIT ELEKTROLIT SAMARIUMTERDOPING CERIUM- (Li/Na)2CO3 UNTUK SOLID OXIDE FUEL CELL BERSUHU RENDAH. Penelitian ini menguji dan menganalisis konduktivitas ionik elektrolit SamariumDoped Cerium(SDC)-(Li/Na)2CO3 pada variasi kandungan karbonat dan suhu untuk aplikasi Solid Oxide Fuel Cell (SOFC) bersuhu rendah. Pelet elektrolit dibuat dengan metode pressureless sintering. Komposisi elektrolit yang digunakan adalah 80 %berat SDC dengan 20%berat (Li/Na)2CO3 dan 70 %berat SDC dengan 30 %berat (Li/Na)2CO3, masing-masing dinamakan SDC8020 dan SDC7030. X-Ray Diffractometer (XRD) digunakan untuk menentukan struktur dan parameter kristal yang dihasilkan. Strukturmikro serbuk yang dihasilkan dikarakterisasimenggunakan Field Emmision Scanning Electron Microscope (FESEM). Analisis Thermo Gravimetric Analysis (TGA) dilakukan pada rentang suhu 30 oC hingga 800 oC untuk menentukan sifat panas bahan. Konduktivitas sel elektrolit diukur menggunakan Impedance Spectroscopy pada rentang suhu 500 oC hingga 650 oC. Pada penelitian ini, serbuk SDC berukuran nano partikel dengan ukuran kristal 36 nm hingga 76 nm dihasilkan dengan metode sol gel. Sel elektrolit dengan metode pressureless sintering menghasilkan nilai kekonduksian ion yang tinggi yaitu rentang 1,74 x10-2 hingga 1,72 x 10-1 S/cm (500 oC hingga 650 oC) dan 4,56 x10-2 hingga 5,87 x 10-1 S/cm (500 oC hingga 650 oC), masing-masing untuk elektrolit SDC8020 dan SDC7030. Penelitian ini memberikan satu sumbangan penting terhadapmetode pembuatan elektrolit SOFC (LT SOFC) yang lebihmurah dan berpotensi diaplikasikan untuk produksi masal untuk aplikasi SOFC bersuhu rendah. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6110 10.17146/jsmi.2013.14.3.4402 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 159-165 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6110/4516 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6111 2026-11-02T01:05:22Z jsmi:ART

MODIFIKASI FISIKO KIMIA MEMBRAN KOMPOSIT KITOSAN POLIVINIL ALKOHOL HASIL CASTING DENGAN TEKNIK INDUKSI IRADIASI GAMMA Erizal Dian Pribadi Perkasa Zuhelmi Aziz Sulistioso G S Polivinil alkohol Kitosan Iradiasi gamma Komposit MODIFIKASI FISIKO KIMIA MEMBRAN KOMPOSIT KITOSAN POLIVINIL ALKOHOL HASIL CASTING DENGAN TEKNIK INDUKSI IRADIASI GAMMA. Penelitian ini bertujuan mensintesis membran komposit PoliVinil Alkohol (PVA) kitosan untuk keperluan Guided Tissue Regeneration (GTR) dengan teknik casting dan mempelajari pengaruh iradiasi gamma pada sifat fisiko kimianya. Campuran larutan PVA10% dan kitosan 2% dengan komposisi 75:25; 50:50;25:75 v/v) dicasting pada suhu kamar dan selanjutnya diiradiasi dengan sinar gamma pada dosis 20 kGy, 30 kGy, 40 kGy dan 50 kGy. Perubahan struktur kimia membran dikarakterisasi menggunakan Fourier Transform-Infra Red (FT-IR). Kemampuan menyerap air dan biodegradasinya diuji secara gravimetri. Perubahan kekuatan tarik dan perpanjangan putus diukur dengan Universal Testing Machine. Hasil evaluasi menunjukkan dengan meningkatnya dosis iradiasi dari 20 kGy hingga 50 kGy, daya serap air dan biodegradasi membran meningkat. Sebaliknya, kekuatan tarik dan perpanjangan putus menurun. Iradiasi gamma selayaknya dapat dipertimbangkan sebagai tool untuk modifikasi polimer. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6111 10.17146/jsmi.2013.14.3.4403 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 166-172 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6111/4517 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6112 2026-11-02T01:05:22Z jsmi:ART

PENGARUH pH TERHADAP STRUKTUR MIKRO DAN SIFAT MAGNET BARIUM HEKSAFERIT. Didin S Winatapura Deswitan M. Toifur Ridwan Ko-presipitasi Magnet BaO.6Fe2O3 Koersivitas PENGARUH pH TERHADAP STRUKTUR MIKRO DAN SIFAT MAGNET BARIUM HEKSAFERIT. Bahan magnet BaO.6Fe2O3 telah berhasil disintesis dengan metodeKo-presipitasi dari prekursor dengan pH = 9 dan pH = 12. Karakterisasi bahan dilakukan menggunakan X-Ray Diffractometer (XRD), Differential Thermal Analysis (DTA)/Thermal Gravimetric Analysis (TGA), Vibrating Sample Magnetometer (VSM), Scanning Electron Microscope (SEM) dan Transmission ElectronMicroscope (TEM). Hasil pengukuran sifat magnetik menggunakan VSM menunjukkan bahwa BaO.6Fe2O3 hasil sintering pada suhu 800o dari prekursor dengan pH = 12 mempunyai nilai koersivitas magnet tertinggi, Hci = 5,6 kOe. Koersivitas magnet ini disebabkan ukuran kristalit sangat halus mendekati domain tunggal. Hal ini didukung oleh hasil pengamatan SEM dan TEM yang menunjukkan bahwa ukuran partikel BaO.6Fe2O3 dari prekursor dengan pH = 12 sekitar 50 nmhingga 150 nm setelah melalui proses sintering pada suhu 800o. Dengan demikian bahan BaO.6Fe2O3 yang diperoleh dari percobaan ini dapat digolongkan sebagai magnet heksaferit berenergi tinggi yang berpotensi untuk dapat digunakan sebagai bahan komponen pembangkit energi. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6112 10.17146/jsmi.2013.14.3.4406 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 173-178 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6112/4518 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6113 2026-10-30T04:38:21Z jsmi:ART

APLIKASI MAGNET PERMANEN BaFe12O19 DAN NdFeB PADA GENERATOR MAGNET PERMANEN KECEPATAN RENDAH SKALA KECIL Pudji Irasari Novrita Idayanti Magnet permanen Barium Ferit NdFeB Generator kecepatan rendah APLIKASI MAGNET PERMANEN BaFe12O19 DAN NdFeB PADA GENERATOR MAGNET PERMANEN KECEPATAN RENDAH SKALA KECIL.Telah dilakukan perancangan dan pembuatan Generator Magnet Permanen (GMP) kecepatan rendah untuk pembangkit listrik skala kecil.Dalammakalah ini dibandingkan karakteristik generator menggunakan magnet permanen barium ferit (BaFe12O19) dan neodymium iron boron (NdFeB). Struktur rotor dipilih tipe surface mounted karena semua fluks menghadap ke lilitan stator dan berperan dalamkonversi energi. Hasil pengujian menunjukkan bahwa pada putaran nominal, generator dengan magnet BaFe12O19 hanya mampu membangkitkan daya 8,87 W sedangkan generator dengan magnet NdFeB mampu membangkitkan daya 1988,93W. BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6113 10.17146/jsmi.2009.11.1.4553 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 38-41 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6113/4524 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6114 2026-11-02T01:05:22Z jsmi:ART

ANALISIS FASA NANO PARTIKEL LiCoO2 SEBAGAI BAHAN KATODA BATERAI MAMPU ISI ULANG MENGGUNAKAN X-RAY DIFFRACTOMETER Elman Panjaitan Sudaryanto Yosef Sarwanto Bambang Soegijono LiCoO2 particle nano LiCoO2 Chatode Lithium batteries ANALISIS FASA NANO PARTIKEL LiCoO2 SEBAGAI BAHAN KATODA BATERAI MAMPU ISI ULANG MENGGUNAKAN X-RAY DIFFRACTOMETER. Telah dilakukan penelitian analisis fasa nano partikel LiCoO2 sebagai bakal bahan katoda dari baterai berbasis ion lithium yang mampu disi ulang menggunakan X-Ray Diffractometer. Nano partikel LiCoO2 dibentuk menggunakan teknik planetary milling yang diikuti sonikasi, hasil pembentukan nano partikel LiCoO2 dianalisis menggunakan Scanning Electron Microscope (SEM) dan Transmission Electron Microscope (TEM), fasa nano partikel LiCoO2 dianalisis menggunakan XRD. Hasil penelitian menunjukan bahwa nano partikel LiCoO2 yang terbentuk berukuran 20 nm hingga 40 nm dan fasa nano partikel LiCoO2 adalah rhombohedral, R-3m, dengan a = b = 2,82 Å dan c = 14,08 Å, dimana LiCo membentuk simetri oktahedral, 3-3m dan CO2 membentuk simetri tetrahedral, 63m. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6114 10.17146/jsmi.2013.14.3.4407 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 179-182 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6114/4519 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6115 2026-11-02T01:05:22Z jsmi:ART

PREPARATION OF LOW TEMPERATURE TiO2 PHOTO ELECTRODE FOR FLEXIBLE DYE SOLAR CELLS APPLICATION Lia Muliani Erlyta S R Jojo Hidayat Shobih Mariya AlQibtiya Flexible dye solar cells TiO2 photoelectrode Low temperature PREPARATION OF LOW TEMPERATURE TiO2 PHOTO ELECTRODE FOR FLEXIBLE DYE SOLAR CELLS APPLICATION. Flexible dye solar cells were dye cell that were assembled using plastic transparent electrodes as substrate, so the cell processing must be applied in low temperature. In this paper, investigation of TiO2 photo electrode preparation will be described. We used a low temperature TiO2 paste which deposited onto Indium Tin Oxide-PolyEthylene Terephthalate (ITO-PET) substrate using doctor blade printing technique. The annealing temperature of the TiO2 layer was 120 oC, 130 oC and 140 oC for 4 hours. The optical properties were investigated by Ultra Violet-Visible Spectrophotometer. The performance of the cell was measured using a solar simulator with light at an intensity of 50 mW/CM2 generated by a xenon lamp. An efficiency of 0.019 % was achieved for such cells with a 2.0 cm2 active area under TiO2 annealed in 120oC. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6115 10.17146/jsmi.2013.14.3.4408 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 183-187 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6115/4520 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6116 2026-11-02T01:05:22Z jsmi:ART

ANALISIS STRUKTUR KRISTAL HASIL LAS FRICTION-STIR WELDING PADA RETREATING SIDE BIMETAL DISIMILAR AA6061-Cu DENGAN TEKNIK DIFRAKSI NEUTRON Tri Hardi Priyanto Bharoto M Refai Muslih Hery Mugirahardjo Bimetal disimilarAA6061-Cu Friction stirwelding Difraksi neutron Stir Zone ThermoMechanically Affected Zone Heat Affected Zone BaseMetal Zone ANALISIS STRUKTUR KRISTAL HASIL LAS FRICTION-STIR WELDING PADA RETREATING SIDE BIMETAL DISIMILAR AA6061-Cu DENGAN TEKNIK DIFRAKSI NEUTRON. Telah dilakukan analisis struktur kristal pada paduan bimetal disimilar Al-Cu. Dari analisis difraksi neutron telah terjadi penurunan parameter kisi Al dari 4,09 Å menjadi 4,05 Å sedangkan parameter kisi Cu relatif konstan. Hal ini disebabkan titik lelehAl jauh lebih rendah dari titik leleh Cu. Secara fisis hal ini terjadi karena selama proses Friction Stir Welding (FSW) pada daerah Stir Zone (SZ) or Nuget Welded Zone (NWZ) terjadi deformasi yang kuat pada suhu sekitar 500 oC. Hal ini menyebabkan rekristalisasi secara dinamis, dimana butir menjadi lebih halus. Pada daerah Thermo Mechanically Affected Zone (TMAZ), terjadi difusi atomik yang disebabkan oleh kombinasi antara deformasi plastik yang kuat dengan suhu tinggi. Untuk daerah Heat Affected Zone (HAZ) masih terdapat aluminium dengan prosentase berat yang sangat kecil, hal ini disebabkan adanya paparan (exposure) pada suhu tinggi selama proses pemanasan FSW, mirip dengan proses annealing (annnealing-like proCess), yang menyebabkan dislokasi lenyap, presipitat melarut dan butir menjadi kasar apabila suhu melebihi 250 oC. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6116 10.17146/jsmi.2013.14.3.4409 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 188-192 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6116/4521 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6117 2026-11-02T01:05:22Z jsmi:ART

PENGARUH UNSUR GERMANIUM TERHADAP KETAHANAN KOROSI PADUAN Zr-Nb-Mo-Ge UNTUK MATERIAL KELONGSONG PERUSAHAAN LISTRIK TENAGA NUKLIR B Bandriyana Agus Hadi Ismoyo Parikin Panduan Zirkonium Germanium Korosi Kelongsong PENGARUH UNSUR GERMANIUM TERHADAP KETAHANAN KOROSI PADUAN Zr-Nb-Mo-Ge UNTUK MATERIAL KELONGSONG PERUSAHAAN LISTRIK TENAGA NUKLIR. Sintesis paduan zirkonium Zr-Nb-Mo-Ge dilakukan untuk memperoleh material kelongsong bahan bakar Perusahaan Listrik Tenaga Nuklir (PLTN). Penambahan unsur Germanium(Ge) dapat meningkatkan kekerasan paduan akibat pembentukan presipitat keras Zr-Ge. Analisis pengaruh unsur Ge terhadap ketahanan korosi dan oksidasi suhu tinggi paduan diperlukan untuk evaluasi komposisi unsur paduan bahan kelongsong. Uji ketahanan korosi dalamlingkungan air demin dan uap air suhu tinggi dilakukan pada sampel paduan dengan komposisi prosen berat Ge 0,5 %, 1 % dan 2 %. Uji oksidasi suhu tinggi dilakukan pada suhu 500 oC dan 800 oC selama 8 jam. Perubahan laju oksidasi dianalisis berdasarkan perubahan berat dan lapisan pelindung oksidasi yang terbentuk selama proses pengujian. Hasil pengujian menunjukkan laju korosi dalam lingkungan air demin untuk sampel dengan 0,5 %Ge, 1 %Ge dan 2 %Ge masing-masing sebesar 0,020 MPY, 0,048 MPY dan 0,0457MPY. Oksidasi pada suhu tinggi 500 oC dan 800 oC selama 8 jam menunjukkan laju oksidasi semakin tinggi dengan meningkatnya kandungan unsur Ge dalam paduan sedangkan tebal lapisan oksida relatif sama sekitar 77 um. Dari hasil pengujian disimpulkan untuk kandungan Ge 0,5 % hingga 2 % ketahanan korosi paduan cukup baik untuk material kelongsong dan penambahan unsur Ge akan menurunkan ketahanan korosi paduan Zr-Nb-Mo-Ge. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6117 10.17146/jsmi.2013.14.3.4410 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 193-198 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6117/4522 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6118 2026-11-02T01:05:22Z jsmi:ART

THE EFFECT OFCu-DOPING ON CRYSTAL STRUCTURE AND MAGNETORESISTANCE IN La0.73 Ca0.27 Mn1-y CuyO3 WITH 0 < y < 0.19 Y E Gunanto B Kurniawan A Purwanto Wisnu Ari Adi S Poertadji Cystal structure HRPD Fullprof program Magnetoresistance THE EFFECT OFCu-DOPINGON CRYSTAL STRUCTURE AND MAGNETORESISTANCE IN La0.73&nbsp;Ca0.27&nbsp;Mn1-y&nbsp;CuyO3&nbsp;WITH 0 &lt; y &lt; 0.19. We studied the crystal structure at room temperature and low temperature, as well as themagneto resistance as a functionmagnetic field at room temperature in the compound La0.73&nbsp;Ca0.27&nbsp;Mn1-y&nbsp;CuyO3&nbsp;with 0 &lt; y &lt; 0.19. To analyze the crystal structure we used X-Ray Diffractometer (XRD) at room temperature and the neutron-powder-diffraction at room temperature and low temperatures. The neutron powder diffraction experiments were under taken with the High Resolution Powder Diffractometer (HRPD) (λ=1.8223 Å) at the Neutron Scattering Center of BATAN using the fullprof program. To analyze the magnetoresistance, we used a four point probe aparatus in the range ofmagnetic fields 0-7600 Oersted. we have found that no change in crystal structure despite of increasing value of y. All samples have structure orthorhombic with space group P nma, but the volume of lattice in low temperature is smaller than room temperature. At room temperature, increasing the value y impact declining value of magneto resistance. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6118 10.17146/jsmi.2013.14.3.4411 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 199-202 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6118/4523 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6119 2026-11-02T01:05:22Z jsmi:ART

CHARACTERIZATION OF LITHIUM THIN FILM BATTERY COMPONENTS PREPARED BY DIRECT CURRENT SPUTTERING Aziz Khan Yahya Wagiyo H H Jodi E Kartini Lithium ion battery Thin film battery DC and RF Sputtering LiCoO2 Li3PO4 LiPON CHARACTERIZATION OF LITHIUM THIN FILM BATTERY COMPONENTS PREPAREDBY DIRECT CURRENT SPUTTERING. New electrolyte materials allow the design of flat lithium primary or secondary batteries for miniaturised devices from smart cards to CMOS back up. In this paper, the preparation of LiPON thin filmcomponent and an all solid-state thin filmbatteries consisting of an LiPON solid electrolyte, layered rocksalt LiCoO2&nbsp;electrode, Pt and ITO current collectors, and amorphous SnO anode manufactured using sputtering and vacuum evaporation techniques is presented and discussed. The crystal structure of the LIPON thin film deposited on different substrates such as glass, Si wafer and Pt surface was characterized by X-Ray Diffractometer (XRD) method. The as-deposited cathode films are amorphous or partially crystallized. The amorphous intensity pattern appear with diffuse peaks situated at angular positions of 2θ ~14º, 22º and 48º. The thin-film battery was characterized by complex impedance- and Scanning Electron Microscope (SEM) method. Cracks, which are dependent upon deposition times, are observed for the as-deposited cathode films The impedance and conductivity characteristics of the sample, do not reflect the standard characteristics of a battery. This type of behaviour could possibly be caused by the existence of a short circuit in the system configuration, so that the sample fails to generate the battery characteristics. In conclusion it could be safely assumed that the final result so far is just a multi-component system with a resistance value of 6 ohm, frequency-dependent capacitance, and a quasi Direct Current conductivity of 1.6 x 10-1 (S). BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6119 10.17146/jsmi.2013.14.3.4412 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 203-208 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6119/4525 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6120 2026-10-30T04:38:21Z jsmi:ART

PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION I Gusti Agung PutraAdnyana Komang Ngurah Suarbawa I Ketut Sukarasa Gallium Nitride PLD, Buffer layer Crystal structure Optical properties PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION. Telah dilakukan studi pengaruh ketebalan lapisan penyangga Galium Nitrida, GaN terhadap struktur kristal dan sifat optik film tipis GaN yang ditumbuhkan dengan metode Pulsed Laser Deposition (PLD). Lapisan penyangga ditumbuhkan pada suhu 450ºC dan laju aliran nitrogen 100 sccm dengan waktu deposisi divariasikan antara 15 menit sampai 45 menit. Film yang diperoleh dikarakterisasi dengan Profilometer DEKTAK IIA, Difraktometer sinar-X dan Spektroskopi UV-Vis. Ketebalan lapisan penyangga berpengaruhterhadap kualitas kristal dan sifat optik film tipis GaN yang ditumbuhkan di atasnya. Dari hasil analisis pola difraksi sinar-X dan spektrum UV-Vis, diketahui bahwa film tipis GaN yang ditumbuhkan di atas lapisan penyangga dengan ketebalan 184,6Å cenderungmemiliki orientasi tunggal (0002) yang lebih baik dengan Full Width at Half-Maximum (FWHM) 0,9º dan energi celah pita (Eg) = 3,4 eV dibanding film tipis GaN dengan ketebalan lapisan penyangga 370,2 Å dan 560 Å. BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6120 10.17146/jsmi.2009.11.1.4560 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 42-46 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6120/4527 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6121 2026-11-02T01:05:22Z jsmi:ART

SINTESIS BAHAN MAGNETIK PSEUDO BROOKITE Fe2TiO5 BERBASIS SUMBER DAYA MINERAL LOKAL Prijo Sardjono Wisnu Ari adi Sudirman Iron sand Magnet Pseudobrookite Fe2TiO5 Crystal structure Microstructure SINTESIS BAHAN MAGNETIK PSEUDO BROOKITE Fe2TiO5&nbsp;BERBASIS SUMBER DAYA MINERAL LOKAL. Telah dilakukan sintesis dan karakterisasi bahan magnet pseudobrookite Fe2TiO5 dari sumber daya alam lokal pasir besi. Mineral pasir besi diperoleh dari pesisir pantai Banten. Pasir besi ini dipreparasi dengan teknik mechanical milling untuk memperoleh ukuran partikel yang kecil. Kemudian pasir besi hasil milling dilakukan leaching dan seperator magnetic untuk menghilangkan pengotor-pengotor non magnetik. Hasil pemisahan dengan separator magnetic ditambahkan TiO2&nbsp;sesuai kaidah stoikiometri untuk dibuat bahan magnet pseudobrookite Fe2TiO5. Sintesis pseudobrookite&nbsp;Fe2TiO5&nbsp;menggunakan metode reaksi padatan melalui proses mechanical milling dan di sintering pada suhu 1.000 oC selama 5 jam. Hasil refinement dari pola difraksi sinar-X menunjukkan bahwa telah terbentuk bahan magnet pseudobrookite&nbsp;Fe2TiO5&nbsp;dengan struktur kristal orthorombik (grup ruang C m c m), parameter kisi a = 3,7233(5) Å; b = 9,774(1) Å dan c = 9,968(1) Å,&nbsp;α&nbsp; =&nbsp;β =&nbsp;γ = 90o, volume unit sel sebesar V = 362,8(1) Å3 dan kerapatan atomik sebesar&nbsp;ρ = 4,178 g.cm-3. Hasil pengukuran sifat magnetik menunjukkan bahwa pseudobrookite&nbsp;Fe2TiO5&nbsp;hasil sintesis bersifat soft magnet dengan medan koersivitas dan magnetisasi remanen berturut-turut adalah 461 Oe dan 0,2 emu/g. Disimpulkan bahwa telah berhasil dibuat bahan magnet pseudobrookite&nbsp;Fe2TiO5&nbsp;dari bahan baku sumber daya alam lokal pasir besi BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6121 10.17146/jsmi.2013.14.3.4416 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 209-213 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6121/4526 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6122 2026-11-02T01:05:22Z jsmi:ART

PENGGUNAAN COMPATIBILIZER UNTUK MENINGKATKAN KARAKTERISTIK MORFOLOGI, FISIK DAN MEKANIK PLASTIK BIODEGRADABEL BERBAHAN BAKU PATI TERMOPLASTIK-LLDPE Waryat M. Romli A Suryani I Yuliasih S Johan Compatibilizer Pati termoplastik LLDPE Plastik biodegradabel PENGGUNAAN COMPATIBILIZER UNTUK MENINGKATKAN KARAKTERISTIK MORFOLOGI, FISIK DAN MEKANIK PLASTIK BIODEGRADABEL BERBAHAN BAKU PATI TERMOPLASTIK-LLDPE. Plastik sebagai kemasan suatu produk sudah banyak dipakai dan digunakan dalamkurunwaktu lama.Namun, limbah plastik tersebut dapatmenimbulkan pencemaran lingkungan dikarenakan plastik sulit untuk terdegradasi olehmikroorganisme. Usaha untukmengurangi ketergantungan terhadap plastik salah satunya adanya penggunaan plastik ramah lingkungan dari bahan baku yang dapat diperbaruhi dengan metode blending. Permasalahan yang dihadapi dalampembuatan plastik biodegradabel berbahan baku campuran antara bahan alami dan sintetis adalah tidak kompetibel antara kedua bahan tersebut karena bahan alami bersifat hidrofilik/polar dan bahan sintetis bersifat hidrofobik/non polar. Untuk meningkatkan kompatibilitas antara kedua campuran itu perlu bahan ditambahkan seperti compatibilizer. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penambahan compatibilizer terhadap sifat fisik danmekanik plastik biodegradabel berbahan baku campuran pati termoplastik dan Linear Low Density PolyEthylene (LLDPE). Penelitian ini dibagimenjadi dua tahap yaitu pembuatan pati termoplastik dan pembuatan plastik biodegradabel. Parameter yang diamati adalah morfologi permukaan plastik, kecepatan alir, densitas, titik leleh dan sifat mekanik. Struktur morfologi permukaan plastik biodegradabel LLDPE menjadi lebih kompatibel dan homogen dengan penggunaan compatibilizer dengan ditandai menyebarnya pati termoplastik (TPS) ke matriks polimer. Compatibilizer berperan sebagai penghubung bahan yang berbeda karakteristik antara LLDPE yang bersifat hidrofobik dan TPS yang bersifat hidrofilik. Penggunaan compatibilizermenjadikan plastik biodegradabel lebih kompatibel dan homogen serta dapat meningkatkan sifat fisik dan mekanik. Compatibilizer mampu meningkatkan adhesivitas permurkaan antara LLDPE dan TPS. Hal tersebut ditandai dengan kecenderungan meningkatnya karakteristik fisik dan mekanik plastik biodegrdabel dengan meningkatnya pemberian compatibilizer. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6122 10.17146/jsmi.2013.14.3.4417 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 214-221 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6122/4528 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6123 2026-11-02T01:05:22Z jsmi:ART

DENSIFIKASI KAYU RANDU (CEIBA PENTANDRA L. GAERTN) DAN PELAPISAN PERMUKAANNYA DENGAN PEMADATAN MENGGUNAKAN RADIASI ULTRA VIOLET Sugiarto Danu Mirzan T. Razzak Dhedy Handono Darsono Marsongko Densifikasi Kayu randu (Ceiba pentandra L. Gaertn) Pelapisan permukaan Radiasi Ultra Violet DENSIFIKASI KAYU RANDU (CEIBA PENTANDRA L. GAERTN) DAN PELAPISAN PERMUKAANNYA DENGAN PEMADATAN MENGGUNAKAN RADIASI ULTRA VIOLET. Proses densifikasi dan pelapisan permukaan kayu randu (Ceiba pentandra L. Gaertn) telah dilakukan dengan metode penekanan dilanjutkan proses pelapisan permukaan dengan pemadatan menggunakan radiasi sinar Ultra Violet (UV). Penekanan dilakukan secara bertahap pada suhu 100 oC untuk mendapatkan variasi pengurangan tebal 15%, 30 %, 45%, 60 %dan 75%dan parameter yang diukur meliputi densitas dan pengembangan tebal kayu. Proses pelapisan dilakukan menggunakan resin poliester tak jenuh setelah dicampur fotoinisiator 2,2-dimetil- 2-hidroksi asetofenon dengan konsentrasi 1 %berat, 2 %berat dan 3 %berat dan bahan pewarna titanium dioksida. Iradiasi dilakukan pada kecepatan konveyor 1 m/menit, 2 m/menit dan 3 m/menit. Penekanan sampai dengan pengurangan tebal 75% meningkatkan densitas secara signifikan danmenurunkan pengembangan tebal. Pada variasi konsentrasi fotoinisiator dan kecepatan konveyor yang dipakai, lapisan mempunyai kekerasan pendulum23 detik hingga 37 detik, nilaiwarna (putih) dengan L = 61%hingga 79%, kilap (60o) = 16%hingga 56%, adesi memenuhi standar ASTMdan tahan bahan kimia dan pelarut yang diujikan kecuali terhadap larutan NaOH 1 %. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6123 10.17146/jsmi.2013.14.3.4413 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 222-228 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6123/4529 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6124 2026-11-02T01:05:22Z jsmi:ART

MODIFIKASI LIMBAH KULIT PISANG UNTUK ADSORBENION LOGAMMn(II)DANCr(VI) Meri Suhartini Kulit Pisang Ikat silang Epiklorohidrin Iradiasi Mn(II) Cr(VI) MODIFIKASI LIMBAH KULIT PISANG UNTUK ADSORBENION LOGAMMn(II)DANCr(VI). Pada penelitian ini Bubuk Kulit Pisang (BKP) dimodifikasi. Modifikasi dilakukan dengan mengikat silang polisakarida yang terdapat pada kulit pisang menggunakan Epiklorohidrin (Epi) sebagai zat pengikat silang dengan inisiator sinar gamma dari sumber Cobalt 60. Modifikasi ini bertujuan memperbaiki sifat fisik dan kimia BKP guna memperpanjang masa pakai dan meningkatkan kemampuan penyerapan ion logam. Hasil penelitian menunjukkan bahwa dosis radiasi optimum pada bubuk kulit pisang hasil modifikasi (BKP-Epi) dicapai pada dosis 10 kGy dengan konsentrasi Epi 10 %, pada kondisi tersebut, kemampuan BKP-Epi dalam menyerap ion logam Mn(II) meningkat 160 % dibandingkan sebelum dimodifikasi. Akan tetapi kemampuan BKP-Epi dalammenyerap ion logamCr(VI)menurun sebesar 43,10%. Terdapat perbaikan terhadap ketahanan asam pada BKP-Epi yang ditunjukkan dengan penurunan kerusakan BKP-Epi sebesar 104,55 %. Analisis Fourier Transform-Infra Red (FT-IR)menunjukkan pergeseran bilangan gelombang puncak sebelumdan sesudah iradiasi, menandakan terjadinya reaksi ikatan silang pada polisakarida tersebut. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6124 10.17146/jsmi.2013.14.3.4414 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 229-234 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6124/4530 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6125 2026-11-02T01:05:22Z jsmi:ART

PENGARUH NANO PARTIKEL TERHADAP AKTIFITAS ANTIAGEING PADA KRIM Dwinna Rahmi Retno Yunilawati Emmy Ratnawati Krim nano partikel Krim biasa Antiageing Konvensional Ultrasonikasi Krim pasar PENGARUH NANO PARTIKEL TERHADAP AKTIFITAS ANTIAGEING PADA KRIM. Telah dilakukan penelitian efek nanopartikel terhadap aktifitas antiaging pada krim. Dalam penelitian ini aktifitas antiaging untuk krim biasa (ukuran partikel &gt; nm) dan krim nanopartikel diuji dengan menggunakan hewan percobaan. Krimbiasa dengan ukuran partikel 1439,8 nmhingga 2573,4 nmdibuat dengan metode konvensinal, sedangkan krim nano partikel (54,6 nm hingga 91,8 nm) dibuat dengan metode ultrasonikasi. Selain itu krim pasar dengan ukuran partikel 548,2 nm hingga 975 nmdiolah kembali dengan ultrasonikasimenjadi krimnano partikel dengan ukuran 72,4 nm hingga 132,2 nm. Hasil uji antiaging untuk krim nano partikel menunjukkan skor rata-rata kerutan adalah 0. Ini menunjukkan bahwa krim nano partikel memiliki potensi untukmelindungi kerusakan kulit yang akan disertai proses penuaan. Begitu juga dengan hasil uji aktifitas antiaging pada krim pasar terlihat meningkat dari 0,25 kerutan menjadi 0 kerutan setelah diolah menjadi nano partikel. BRIN Publishing (Penerbit BRIN) 2013-04-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6125 10.17146/jsmi.2013.14.3.4415 Jurnal Sains Materi Indonesia; Vol. 14 No. 3 (2013): Jurnal Sains dan Materi Indonesia; 235-238 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6125/4531 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6126 2026-10-30T04:38:21Z jsmi:ART

DEGRADASI ZAT WARNA METHANIL YELLOW SECARA SONOLISIS DAN FOTOLISIS DENGAN PENAMBAHAN TiO2 ANATASE Safni Fardila Sari Fardila Sari Maizatisna Maizatisna Maizatisna Zulfarman Zulfarman Methanil yellow Sonolisis Fotolisis TiO2 anatase DEGRADASI ZAT WARNA METHANIL YELLOW SECARA SONOLISIS DAN FOTOLISIS DENGAN PENAMBAHAN TiO2&nbsp;ANATASE. Degradasi zat warna methanil yellow telah dilakukan secara sonolisis dan fotolisis dengan penambahan TiO2&nbsp;anatase. Metode sonolisis menggunakan iradiasi ultrasonik dengan frekuensi 47 kHz. Degradasi zat warna methanil yellow 6 mg/L secara sonolisis dengan penambahan 0,1000 g TiO2&nbsp;anatase optimum pada pH 5 suhu 40 ºC, dan persentase degradasi diperoleh sebesar 41,74% setelah 300 menit sonolisis. Metode fotolisis menggunakan iradiasi sinar UV dengan  = 359 nm. Degradasi methanil yellow 6mg/L secara fotolisis dengan penambahan 0,1000 g TiO2&nbsp;anatase optimumpada pH 5 dengan persentase degradasi mencapai 80,99% setelah 90 menit fotolisis, sementara secara sonolisis hanya diperoleh persentase degradasi sebesar 26,86% pada waktu yang sama. BRIN Publishing (Penerbit BRIN) 2009-10-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6126 10.17146/jsmi.2009.11.1.4562 Jurnal Sains Materi Indonesia; Vol. 11 No. 1 (2009): Jurnal Sains dan Materi Indonesia; 47-51 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6126/4540 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6127 2026-11-02T01:27:18Z jsmi:ART

MORPHOLOGY EFFECT ON BEHAVIOUR OF PHOSPHORICACIDIN SUPRAMOLECULAR STRUCTURED POLYMER MEMBRANE FUEL CELL Sunit Hendrana Febrina Tri Hartanti Iman Rahayu Supramolecular Fuel cellmembrane Sulfonated polystyrene Polyethylene-graft-maleic anhydride Morphology Phosphoric acid MORPHOLOGY EFFECT ON BEHAVIOUR OF PHOSPHORICACIDIN SUPRAMOLECULAR STRUCTURED POLYMER MEMBRANE FUEL CELL. Study on the effect of morphology on the conductivity of small molecules added polymer membrane for fuel cell has been done. The polymer electrolyte membrane fuel cell was made by constructing of supramolecular interaction between sulfonated polystyrene and polyethylene-graft-maleic anhydride. The small molecules used was benzimidazole and phosphoric acid. The addition of benzimidazole and phosphoric acid, was espected to improve to ionic conductivity. However, in this work it was observed that morphology of the membrane play vital roles in the final properties of the membrane. In other words, beside concentration of phosphoric acid the morphology affects the conductivity of polymer membrane fuel cell. BRIN Publishing (Penerbit BRIN) 2013-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6127 10.17146/jsmi.2013.14.4.4380 Jurnal Sains Materi Indonesia; Vol. 14 No. 4 (2013): Jurnal Sains dan Materi Indonesia; 241-247 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6127/4532 https://creativecommons.org/licenses/by-sa/4.0 133c221ca433a5cb3c9a5f3405477d90