2026-04-18T01:16:56Z https://ejournal.brin.go.id/jsmi/oai

oai:ejournal.brin.go.id:article/185 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2024-08-12T12:24:41Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-05-17T03:59:44Z 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 2023-06-15T10:48:29Z 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 2025-03-27T16:53:44Z 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) 2025-03-27 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 2024-08-12T12:24:41Z 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 2024-08-27T16:51:31Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/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 2024-05-16T03:11:13Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4923 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 2024-05-16T03:11:13Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4924 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 2024-05-16T03:11:12Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4925 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 2024-05-16T03:11:12Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4926 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 2024-05-16T03:11:11Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4927 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 2024-05-16T03:11:11Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4929 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 2024-05-16T03:11:01Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4948 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 2024-05-16T03:11:01Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4950 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 2024-05-16T03:11:00Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4951 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 2024-05-16T03:11:00Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4952 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 2024-05-16T03:10:59Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4954 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 2024-05-16T03:10:59Z jsmi:ART

Simulation of 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4955 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 2024-05-16T03:10:58Z 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) 2024-05-16 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/4956 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/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/5803 2025-03-27T16:53:44Z 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) 2025-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/5803 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:ojs.ejournal.brin.go.id:article/5838 2024-08-06T07:21:31Z jsmi:ART

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/6040 2025-03-18T01:43:23Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6040 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 2025-03-18T01:43:23Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6041 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/6044 2025-03-18T01:43:23Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6044 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 2025-03-18T01:43:23Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6045 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/6048 2025-03-18T01:43:23Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6048 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 2025-03-18T01:43:22Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6049 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/6051 2025-03-18T01:43:22Z 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) 2025-03-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6051 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/6199 2025-08-31T13:32:43Z jsmi:ART

Formulation and Characteristics of Sunscreen Cream based on Isolated Lignin from Oil Palm Empty Fruit Bunch (OPEFB) : Formulation and Characteristics of Sunscreen Cream Restu, Witta Kartika Rusumayanti, Felli Septiyanti, Melati Muryanto Aryana, Nurhani Mawarni, Rista Siti Meliana, Yenny Sondari, Dewi Fatriasari, Widya Ogino, Chiaki Lignin Black liquor Sunscreen cream Sun protection factor (SPF) Antioxidant Lignin was recovered from black liquor during the biorefinery process and has prospective applications in pharmaceutical, cosmetic, and health care. Lignin, which has substantially smaller particles, was used as the active ingredient in the sunscreen cream formulation. The isolated lignin was examined for physicochemical parameters such as yield, purity, particle size, total phenol, and morphology. The obtained lignin was used in the preparation of sunscreen cream. The isolated lignin concentration in the cream varied between 0.1, 1, and 2 wt%. The sun protection factor (SPF) of the designed sunscreen creams was assessed, and antioxidant activity and stability were studied, which included pH, particle size, and appearance during the observation period. The formulated cream has an SPF of approximately 15, which is sufficient to protect human skin from the sun's UV radiation. Furthermore, the most significant antioxidant activity was found to be 68.94%. As a result, the developed sunscreen cream has the potential for further research because it is composed of natural active ingredients that are safe for humans and the environment. 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/6199 10.55981/jsmi.2025.6199 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 122-130 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/6199/8380 Copyright (c) 2025 Witta Kartika Restu, Felli Rusumayanti, Melati Septiyanti, Muryanto, Nurhani Aryana, Rista Siti Mawarni, Yenny Meliana, Dewi Sondari, Widya Fatriasari, Chiaki Ogino https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6315 2025-03-27T16:53:44Z jsmi:ART

EFEK ANIL SUHU RENDAH PADA TERFENOL-D YANG DIBUAT DENGAN METODE REDUKSI-DIFUSI M.I. Maya Febri Mashadi Annealing Terfenol-D Reduction Diffusion EFEK ANIL SUHU RENDAH PADA TERFENOL-D YANG DIBUAT DENGAN METODE REDUKSI-DIFUSI — Dalam kegiatan ini dipelajari efek anil suhu rendah pada paduan magnetostriktif yang diperoleh dengan metode Reduksi-Difusi (RD). Diharapkan bahwa apabila cuplikan sebelumnya mengandung fasa sekunder berupa hidrida, fasa tersebut dapat dihilangkan dengan perlakuan anil tersebut. Anil dilakukan pada suhu 200°C, selama 8 jam, dalam vakum dinamis pada cuplikan berbentuk pelet yang dibungkus dalam lembaran Tantalum. Dalam ruangan cuplikan diletakkan pula 'getter' yaitu Ti murni. Hasil analisis data XRD menunjukkan beberapa aspek: pertama, ada kecenderungan penyempitan puncak-puncak difraksi setelah anil. Diduga ini akibat 'internal stress relieve', karena pada suhu anil tersebut, tidak ada perbaikan tingkat kristalisasi sampel. Kedua, fasa hidrida dapat dihilangkan melalui perlakuan anil ini, dan ketiga, pada cuplikan tertentu terlihat ada pergeseran posisi puncak-puncak difraksi fasa utama ke arah sudut yang lebih besar, menandakan bahwa fasa utama tersebut pada awalnya juga mengandung hidrogen dalam jumlah yang sangat kecil, yang belum pernah terdeteksi sebelumnya. Sebagai kesimpulan, perlakuan anil tersebut memberikan dampak positif pada cuplikan Terfenol-D, dan merupakan modifikasi penting dari metode sintesis Reduksi-Difusi. BRIN Publishing (Penerbit BRIN) 2025-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6315 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 10-14 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6315/4672 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6317 2025-03-27T16:53:44Z jsmi:ART

MODEL MATEMATIK ALAT PENYERAP KEJUTAN MOBIL YANG MENGGUNAKAN PADUAN SHAPE MEMORY Muhammad Natsir Model Matematik Alat Penyerap Kejutan Mobil Paduan Shape Memory MODEL MATEMATIK ALAT PENYERAP KEJUTAN MOBIL YANG MENGGUNAKAN PADUAN SHAPE MEMORY. Telah disusun model matematik alat penyerap kejutan yang menggunakan paduan Shape memory. Paduan shape memory merupakan paduan yang memiliki sifat yang unik dan mempunyai aplikasi yang luas. Paket Program Simulasi Tak Linier (SIMNON) digunakan untuk mengolah model matematik tersebut. Hasil perhitungan simulasi menunjukkan bahwa secara teoritis aplikasi paduan shape memory pada alat penyerap kejutan adalah layak. Hal ini terlihat bahwa walaupun temperatur naik, koefisien redam konstan. BRIN Publishing (Penerbit BRIN) 2025-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6317 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 15-21 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6317/4673 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6318 2025-03-27T16:53:44Z jsmi:ART

FABRIKASI LAPISAN TIPIS CuInS2 MENGGUNAKAN METODA REACTIVE SPUTTERING Mohammad Mustafa Sarinanto CuInS2 reactive sputtering difraksi sinar-x FABRIKASI LAPISAN TIPIS CuInS2 MENGGUNAKAN METODA REACTIVE SPUTTERING. Lapisan tipis CuInS2 telah dipreparasi di atas Pyrex slide glass dengan menggunakan metoda reactive sputtering, dengan temperatur substrat 200-350°C dimana sebagai gas pereaksi digunakan CS2. Kecepatan pertumbuhannya adalah 0,5 — 1 pm/jam. Film kristal yang diperoleh mempunyai orientasi (112) sejajar dengan substrat. BRIN Publishing (Penerbit BRIN) 2025-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6318 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 23-25 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6318/4674 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/6319 2025-03-27T16:53:44Z jsmi:ART

PEMBUATAN DAN KARAKTERISASI SEL BATERAI SEKUNDER BAHAN SUPERIONIK AeRbAg4I1RbI3 N. Effendi A. K. Jahja S. Purnama Sintesis baterai sekunder karakterisasi Ag/RbAg415/ RbI3 PEMBUATAN DAN KARAKTERISASI SEL BATERAI SEKUNDER BAHAN SUPERIONIK AeRbAg4I1RbI3. Bahan elektrolit padatan berbasis perak RbAg4I5 telah digunakan sebagai elektrolit untuk pembuatan sebuah sel baterai sekunder (rechargeable) dengan Ag sebagai anoda dan RbI3 sebagai katoda. Telah dilakukan pengukuran karakteristik pengisian-peluwahan (charge-discharge) dan polarisasi terhadap baterai pada kondisi tekanan atmosfir biasa dan temperatur ruang. Dapat disimpulkan bahwa konfigurasi sel Ag/RbAg4I5/ Rb13 dapat berfungsi sebagai baterai sekunder. Sel dapat berfungsi dengan balk pada rapat arus hingga 230 RA/cm1. BRIN Publishing (Penerbit BRIN) 2025-03-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/6319 Jurnal Sains Materi Indonesia; Vol. 1 No. 2 (2000): Jurnal Sains dan Materi Indonesia; 26-31 2614-087X 1411-1098 eng https://ejournal.brin.go.id/jsmi/article/view/6319/4675 https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/7953 2025-08-31T13:32:43Z jsmi:ART

Thermal Evaporation of Graphene on Silicon: A Molecular Dynamics Simulation pamungkas, mauludi ariesto A. B. Gien F. S. Farista D. J. D. H. Santjojo Graphite Silicon Thermal evaporation Molecular dynamics Simulation Silicon, a ubiquitous element in modern electronics, underpins the operation of countless devices due to its unique semiconducting properties. However, as device dimensions shrink to the nanoscale, silicon-based devices face limitations such as increased power consumption and decreased performance. Coating silicon with graphene is aimed to improve the device performance and extend the limits of silicon’s performance. Conducting experimental work involving graphene for thin coatings is a resource-intensive process. Hence, molecular dynamics (MD) simulation is necessary to illuminate the evaporation and coating mechanisms at the atomic scale, serving as a valuable tool for experimental design. These molecular dynamics simulations have elucidated the intricate relationship between temperature and deposition time in governing the quantity and spatial distribution of carbon atoms on a silicon substrate. Within a 300 ps deposition interval, a non-linear correlation between temperature and carbon deposition is observed, indicating that the allotted time is insufficient for complete atomic diffusion and homogeneous distribution. At elevated temperatures, carbon atoms accumulate, impeding the diffusion of subsequent atoms. Conversely, a 600 ps deposition period reveals a direct proportionality between temperature and carbon deposition, attributed to the enhanced mobility of carbon atoms, facilitating their dispersion and creation of vacancies within the substrate. 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/7953 10.55981/jsmi.2025.7953 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 131-137 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/7953/8381 Copyright (c) 2025 mauludi ariesto pamungkas, A. B. Gien, F. S. Farista, D. J. D. H. Santjojo https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/8753 2025-08-31T13:32:43Z jsmi:ART

Copper Dissolution Rate of Modified Self-Polishing Antifouling Paint with Cerium Oxide Nikitasari, Arini Irawan, Januar Priyotomo, Gadang J.W. Soedarsono Riastuti, Rini Self-polishing Antifouling Biofouling SeaNine 211 Cerium oxide Leached-out test The main objective of the work is to substitute SeaNine 211 in self-polishing antifouling (SPA) paint formulations for marine coating using cerium oxide as a co-biocide. The development of SPA paint with cerium oxide as a co-biocide is expected to significantly improve the environmental friendliness and efficacy of antifouling paints. The preparation of modified SPA paint was undertaken by incorporating the cerium oxide with various concentrations (0.1, 0.3, and 0.5 wt.%) in the SPA paint formulation without SeaNine 211. The copper dissolution rate determines the efficacy of antifouling paint, where the greater the copper release rate, the greater the efficacy of the antifouling paint. The leached-out test results obtained suggest that with an increase of 0.1% wt in the concentration of cerium oxide, there was an improvement in the copper dissolution rate. It was also observed that the mild steel specimens were coated with modified SPA paint when immersed in the seawater for 7 days for testing. The properties were observed by utilizing scanning electron microscopy (SEM). An improvement in the copper dissolution rate was found, as shown by cerium oxide SPA paint when contrasted with bare paint. The contact angle test finding also suggests that adding 0.1% wt of cerium oxide to the SPA paint will increase the dissolution rate of copper. This work could provide insight into developing an environmentally friendly antifouling paint co-biocide. 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/8753 10.55981/jsmi.2025.8753 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 138-146 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/8753/8382 Copyright (c) 2025 Arini Nikitasari, Januar Irawan, Gadang Priyotomo, J.W. Soedarsono, Rini Riastuti https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/8937 2025-09-01T16:12:26Z jsmi:ART

Recent Progress on Colorimetric Sensor for Hg(II) Detection Hakim, Muh. Supwatul Hermayantiningsih, Dwi Wahyuningsih Manurung, Tety Ariefin, Mokhamat Roil Bilad, Muhammad mercury colorimetric sensor Mercury (Hg) contamination presents significant effects on human health and the environmental, particularly caused by its bio-accumulative and neurotoxic properties. Effective detection of Hg(II) is essential for monitoring and mitigating its impact. Among various detection methods, colorimetric sensors have developed into a promising solution due to their affordability, simplicity, and real-time detection capabilities. This review summarizes recent advancements in colorimetric sensors for Hg(II) detection, focusing on innovative materials such as silver nanoparticles (AgNPs), gold nanoparticles (AuNPs), paper-based substrates, agarose biopolymers, and carbon dots (CDs). AuNPs and AgNPs are highlighted for their unique optical properties and sensitivity, enabling visible detection through surface plasmon resonance changes. Paper-based sensors offer portability and low-cost solutions, while agarose serves as a stable biopolymer matrix for immobilizing detection agents. CDs, with their tunable fluorescence properties and green synthesis potential, provide a biocompatible option for hybrid sensing systems. Despite significant progress, challenges such as stability, selectivity in complex matrices, and scalability of green synthesis remain. Future research should focus on integrating these sensors into portable platforms and enhancing their performance for field applications. This review underscores the critical role of innovative materials and sustainable techniques in advancing mercury detection technologies BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/8937 10.55981/jsmi.2025.8937 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 1-10 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/8937/10580 Copyright (c) 2025 Muh. Supwatul Hakim, Dwi Hermayantiningsih, Tety Wahyuningsih Manurung, Mokhamat Ariefin, Muhammad Roil Bilad https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/8959 2025-09-01T16:12:26Z jsmi:ART

Study of the Effect of Ultraviolet Exposure Duration on Polypropylene Properties Saputra, Andri Sitinjak, Tria Madeline Warmiati Hermiyati, Indri Ratnaningsih, Wahyu Hariyadi, Asful Nurry, Dennis Farina degradation exposure plastics polypropylene ultraviolet Prolonged exposure to ultraviolet (UV) radiation significantly alters the chemical, thermal, and mechanical properties of polypropylene (PP), leading to degradation and reduced material performance. This study aims to investigate the effect of exposure length to UV on the chemical properties (functional and thermal) and mechanical properties (tensile strength) of PP. Specimens were subjected to UV exposure for 0 (control), 125, 175, 225, 275, 325, 375, and 625 days. FTIR analysis indicates UV exposure chemically degrades polypropylene (PP) by generating new oxygenated groups (–OH and C=O at 3368 cm⁻¹ and 1586 cm⁻¹) and damaging its main molecular structure (C-H at 2949 cm⁻¹, 2867 cm⁻¹, and 841 cm⁻¹). Prolonged UV exposure alters the thermal properties of polypropylene (PP), as indicated by DSC analysis, which shows broadening and shifting of the melting peak (175–180 °C) due to crystallinity changes and increased oxidation. The mechanical properties also deteriorate, with a critical reduction in tensile strength, particularly between 225 and 375 days, indicating an accelerated degradation phase. After 625 days, tensile strength declines by approximately 59%, confirming the substantial impact of extended UV exposure on PP’s durability. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/8959 10.55981/jsmi.2025.8959 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 11-18 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/8959/10581 Copyright (c) 2025 Andri Saputra, Tria Madeline Sitinjak, Warmiati, Indri Hermiyati, Wahyu Ratnaningsih, Asful Hariyadi, Dennis Farina Nurry https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/8982 2025-08-31T13:32:43Z jsmi:ART

Surface Modification of Hematite using Stearic Acid as Hydrophobic Inorganic Pigment Materials Iqbal, Rendy Muhamad Agnestisia, Retno Damsyik, Akhmad Sinaga, Tiara Cristy Agatha Khaerudini, Deni Shidqi Wulandari, Ika Octavia Susanti, Indri Putra, Riandy F. Adany Hematite Hydrophobic Inorganic Pigment Stearic The inorganic pigment is a material that determines the color of a paint that can be used as a coating material. Until now, the basic material for red pigment, namely hematite, has been imported to meet domestic needs. This study aims to develop a hematite-based inorganic pigment material from the mill-scale waste of PT Krakatau Steel by modifying the surface to be hydrophobic, making the pigmenting material resistant to acid attack and preventing peeling and corrosion of the material. The surface modification of hematite is carried out by reacting it with stearic acid into ethanol as a solvent. Hematite was immersed in a stearic acid solution with various concentrations of 2, 4, 6, and 8% for 6 hours; it was then separated by filtration and followed by the drying process. The hematite-stearic was characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR), scanning electron microscope (SEM), and water contact angle (WCA). The results show that the grafting process successfully changed the properties of hematite to hydrophobic. It is also supported by the FTIR spectrum due to the presence of molecular vibration of C-H, C=O, C-O, and Fe-O. Then, the higher contact angle is 150.474° for the stearic acid concentration of 6%. 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/8982 10.55981/jsmi.2025.8982 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 147-155 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/8982/8383 Copyright (c) 2025 Rendy Muhamad Iqbal, Retno Agnestisia, Akhmad Damsyik, Tiara Cristy Agatha Sinaga, Deni Shidqi Khaerudini, Ika Octavia Wulandari, Indri Susanti, Riandy Putra, F. Adany https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/8998 2025-09-01T16:12:26Z jsmi:ART

Electronic Structure of Various Shapes of Graphene Quantum Dot Ramli, Irwan N. Sani Sukarti Nurmalasari Graphene Electronics structure Quantum dots – We reported our study the electronic structure of graphene in bulk structure and graphene quantum dot (GQD) by density functional theory (DFT) by using in quantum espresso (QE) package. In order simulate the realistic shape of GQD, we set vacuum layer to avoid interaction between quantum dot in the periodic structure in crystal. We examined various shape of quantum dot namely triangular, Hexagon, parallelogram. The band gap is tunable by its shape which open wide application of GQD.  We showed that we can tuning the electronic structure of graphene by tuning its structure. In bulk structure, graphene is zero-gap semiconductor. On the other hand, the results on GQD showed the discrete energy level and different shapes of GQD have different energy level and band gap. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/8998 10.55981/jsmi.2025.8998 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 19-23 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/8998/10582 Copyright (c) 2025 Irwan Ramli https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9018 2025-08-31T13:32:43Z jsmi:ART

Double Emulsion Based Alginate/Chitosan Prepared by Ultrasound for Bioactive Encapsulation Prasetyaningrum, Aji Ashianti, Aulia Dwi Rokhati, Nur Setyaningsih, Yuliani Double emulsion Ultrasound Stability Encapsulation Alginate/chitosan Water-in-oil-in-water (W/O/W) emulsion is an effective technology for encapsulating bioactivity but has poor stability. This study aims to evaluate the effect of ultrasonication on the preparation of double emulsions with varying alginate/chitosan ratios (1:1, 1:2, 2:1) and sonication times between 0 and 7 minutes. The results showed that a sonication time of 7 minutes resulted in the best storage stability (0.00–1.02%) and thermal stability (17.13–23.21%), a significant decrease in droplet size (2.08–2.87 μm), and higher emulsion activity index (EAI) (16.11–38.10 m2/g) and emulsion stability index (ESI) (63.28–89.74 min) values. The alginate/chitosan ratio of 2:1 also gave the most optimal results with storage stability of 4.58%, thermal stability of 36.23%, droplet size of 2.08–4.14 μm, and EAI and ESI values of 16.12 m2/g and 48.42 min. The ultrasonic-assisted alginate/chitosan double emulsion method effectively improved the stability and bioavailability of bioactive and presents significant potential for food and pharmaceutical applications. 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/9018 10.55981/jsmi.2025.9018 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 156-164 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/9018/8384 Copyright (c) 2025 Aji Prasetyaningrum, Aulia Dwi Ashianti, Nur Rokhati, Yuliani Setyaningsih https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9027 2025-08-31T13:32:43Z jsmi:ART

Color and Total Organic Carbon (TOC) Removal from Peat Water Using The Electrocoagulation Process: Central Composite Design for Optimization Mirwan, Agus Dessy, Sheilvina Milliviyanthi Wicakso, Doni Rahmat Suherman, Bella Febrianty Putri Nurhalisa, Siti Central composite design Electrocoagulation Peat water Color removal TOC removal The electrocoagulation process is simple and environmentally friendly. It removes pollutants in peat water such as color and total organic carbon (TOC). In this study, the electrocoagulation process was designed, optimized, and investigated using central composite design (CCD) type response surface methodology (RSM). The effects of current density and reaction time in the range of 6–14 mA/cm2 and 30–90 minutes on the efficiency of color and TOC treatment were evaluated. The best results for removing output efficiency were 10 mA/cm2 for 30 minutes (98.1% color) and 10 mA/cm2 for 30 minutes (91% TOC). By comparing actual and predicted data, the optimum condition in this process occurs when the current density is 6.140 mA/cm2 and the reaction time is 76.042 minutes. The experimental data can be well described using the central composite design 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/9027 10.55981/jsmi.2025.9027 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; 165-172 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/9027/8385 Copyright (c) 2025 Agus Mirwan, Sheilvina Milliviyanthi Dessy, Doni Rahmat Wicakso, Bella Febrianty Putri Suherman, Siti Nurhalisa https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9207 2025-09-01T16:12:26Z jsmi:ART

Binary Composite of Chitosan-Derived Porous Carbon/PANI for High Capacitance Performance of Supercapacitors Gala, Kyla Amalia Henra Gurning Prasetyo, Imam Ariyanto, Teguh Supercapacitor Nanocomposite Porous Carbon Chitosan Polyaniline The study of carbonaceous electrode materials for supercapacitors is expanding and remains challenging. Chitosan is one of the many biomasses found in nature that can be converted into porous carbon for electrode materials in supercapacitors. Despite having a high specific surface area and good chemical stability, porous carbons have a limitation of specific capacitance. On the other hand, polyaniline (PANI), a conductor polymer, typically exhibits high specific capacitance but has low stability. Thus, a binary nanocomposite of chitosan-derived porous carbon (CCS) and PANI is suggested to obtain an optimal performance. Porous carbon was produced from chitosan through two steps: (i) hydrothermal carbonization; (ii) chemical activation using steam at a temperature of 800 °C for 2 hours. The CCS was then oxidized with diluted H2O2 to increase surface wettability. Binary nanocomposites were produced by a nanocompositing method of in situ polymerization of PANI with a variation of 5% (CCS/PANI5%), 10% (CCS/PANI10%), and 15% (CCS/PANI15%). The materials were characterized by scanning electron microscopy–energy dispersive X-ray (SEM-EDX), Fourier-transform infrared (FTIR), N2-sorption analysis, and thermogravimetric analysis (TGA). Meanwhile, electrochemical tests were performed using a three-electrode method to obtain cyclic voltammetry and the capacitance of each sample. The N2-sorption analysis showed that the surface area of samples CCS, CCS/PANI5%, CCS/PANI10%, and CCS/PANI15% are 1305 m2.g-1, 430 m2.g-1, 333 m2.g-1, and 238 m2.g-1, respectively. SEM-EDX, FTIR, and TGA proved that PANI is loaded in the carbon surface. From the electrochemical tests conducted at a scan rate of 5 mV.s⁻¹, the specific capacitance values for the samples CCS, PANI, CCS/PANI5%, CCS/PANI10%, and CCS/PANI15% were determined to be 220.27 F.g⁻¹, 143.81 F.g⁻¹, 330.42 F.g⁻¹, 434.73 F.g⁻¹, and 391.27 F.g⁻¹, respectively. The CCS/PANI10% sample exhibited the highest specific capacitance of 434.73 F.g⁻¹, corresponding to an energy density of 86.9 Wh.kg⁻¹ and a power density of 1.3 kW.kg⁻¹. These significant enhancements in specific capacitance underscore the effectiveness of the nanocomposite approach and highlight its potential for improving electrode performance. As a result, the chitosan-based porous carbon and polyaniline nanocomposite developed in this study is a promising candidate for supercapacitor electrode materials. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/9207 10.55981/jsmi.2025.9207 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 44-53 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/9207/10586 Copyright (c) 2025 Kyla Amalia Gala, Henra Gurning, Imam Prasetyo, Teguh Ariyanto https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9439 2025-09-01T16:12:26Z jsmi:ART

Mechanical Properties of Banana Peduncle Fiber Ropes Nur, Christmastuti Djati, Imam Damar Widiawati, Dian Banana Peduncle Material Substitution Mechanical Properties Fiber ropes Tensile Strength Banana plants are utilized in almost all parts except for the peduncle due to their hardness and the presence of gum. This research, aimed at evaluating the mechanical properties of banana peduncle fiber, particularly its tensile strength, is significant in exploring the potential of this underutilized part of the plant. The tensile test followed the SNI 12-0064-1987 standard to assess and compare Manila and sisal ropes. Six types of fiber were tested: bleached peduncle fiber, unbleached peduncle fiber, abaca (Manila) fiber, coir fiber, marketed abaca fiber, and marketed coir. The highest average maximum load was found in marketed abaca rope, which measured 346.7 kg. However, this is still below the minimum load standard required by SNI, which is 480 kg. The results of the marketed abaca differ from those of abaca ropes spun using a foot spindle, indicating that the spinning and twisting techniques significantly influence tensile test outcomes. The test also shows that the bleaching process weakens the fiber strength because the unbleached banana peduncle ropes reach a higher average maximum load (92.9 kg) than the bleached banana peduncle ropes (45.2 kg). Moreover, the tensile strength tests revealed that the average breaking load of banana peduncle fiber rope was 92.9 kg, comparable to abaca fiber at 93.7 kg and coir fiber at 92.8 kg. This comparison was based on similar variables: a diameter of 8 millimeters, similar spinning techniques using a foot spindle, and no prior bleaching process. These findings underscore the potential of underutilized banana peduncle fiber ropes as a promising alternative to abaca or coir due to their load-bearing capabilities. It is important to note that the results of this tensile test are comparative rather than absolute. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/9439 10.55981/jsmi.2025.9439 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 24-30 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/9439/10583 Copyright (c) 2025 Christmastuti Nur, Imam Damar, Dian Widiawati https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9708 2025-09-01T16:12:26Z jsmi:ART

The Influence of Anodizing Electrolyte Concentration on Ni-P Deposition on Anodic Aluminum Oxide (AAO) Rizkia, Vika Susanto, Iwan Belyamin Garjati, Vina Nanda Hapsari, Ade Utami Raharjo, Jarot Damisih Pravitasari, Retna Deca Electroless Deposition Ni-P Anodic Aluminum Oxide Aluminum Alloy Aluminum alloys suffer from deficiencies in surface performance due to insufficient resistance to corrosion and mechanical qualities in harsh environments. Therefore, it is crucial to apply a protective surface modification during the manufacturing process of the aluminum component. The electroless deposited Ni-P shows great potential as a protective coating due to its simple manufacturing process and outstanding performance. This study investigates the effect of oxalic acid concentration in the anodizing process on electroless Ni-P coating. In this study, Anodic Aluminum Oxide (AAO) is formed by an anodizing process on 0.3,0.5, and 0.7 oxalic acids prior to Ni-P electroless deposition. The resulting Ni-P layer has a nodular-like morphology with a size in the order of 0.5 m or less. Moreover, the AAO surface is covered by a thin and tightly formed layer of nickel particles. The EDX analysis shows the oxygen percentage falls by up to 70% after Ni deposition in all anodizing parameters, as compared to the anodized specimens alone. In addition, the nickel content gradually decreases as the concentration of oxalic acid increases from 0.3 M to 0.7 M. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/9708 10.55981/jsmi.2025.9708 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 31-36 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/9708/10584 Copyright (c) 2025 Vika Rizkia, Iwan Susanto, Belyamin, Vina Nanda Garjati, Ade Utami Hapsari, Jarot Raharjo, Damisih, Retna Deca Pravitasari https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/9988 2025-09-01T16:12:26Z jsmi:ART

Quercetin Encapsulation on Chitosan-Pectin Membranes as a Drug Delivery and Its Release Kinetics Hastuti, Budi Hadi, Saptono Nisriyah, Safarin Martanisa, Mutiah Kamari, Azlan Chitosan pectin polyelectrolyte complex Quercetin Chitosan-pectin membranes are biodegradable polyelectrolyte complexes, derived from biomaterials, with good stability for drug delivery applications. This study investigates the potential of these membranes to encapsulate quercetin, a flavonoid known for its therapeutic properties but limited for its low solubility, poor bioavailability, and rapid elimination. The membranes were synthesized using a 1:1 (w/w) chitosan-to-pectin ratio and loaded with quercetin via solvent evaporation. Characterization using FTIR confirmed the presence of OH, C=O, and NH groups; XRD indicated semi-crystalline structure; and SEM revealed a uniform, porous morphology. The maximum quercetin loading efficiency reached 82.43%, with the highest release (90.39%) observed at pH 1.2, following first-order kinetics. The resulting membrane was thin, brown, homogeneous, and tear-resistant, demonstrating its potential as a controlled drug delivery matrix for quercetin BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/9988 10.55981/jsmi.2025.9988 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 37-43 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/9988/10585 Copyright (c) 2025 Budi Hastuti, Saptono , Safarin Nisriyah, Mutiah Martanisa, Azlan Kamari https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/10067 2026-02-05T01:22:31Z jsmi:ART

The Influence of pH on Structural, Morphological, and Optical Properties of Al2O3 Nanoparticles Synthesized by Syzygium aromaticum Leaf Extract Anggara Budi Susial Natasya Frysillia Wardani Rahmat Setiawan Mohar Nurfina Yudasari Artoto Arkundato Suhendar, Haris Hadi Nasbey Imam Basori Tan Swee Tiam Iwan Sugihartono Al2O3 Nanoparticles Crystallize Size Crystal Structure Morphology Optical Properties Aluminum oxide (Al2O3) nanoparticles have been synthesized through a biosynthesis approach, employing Syzygium aromaticum leaf extracts prepared under varying acidic conditions as bioreductants in the reaction with aluminum nitrate nanohydrate. The Al2O3 nanoparticles were annealed at 450 °C for one hour to facilitate the formation. Then, the samples were characterized for their crystal structure, morphology, and optical properties using X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), and UV-visible (UV-Vis) spectrophotometry, respectively. XRD analysis confirmed that the Al2O3 nanoparticles possess an orthorhombic crystal structure, corresponding to Inorganic Crystal Structure Database (ICSD) entry #98-009-4485. The average crystallite sizes were measured to be 37.36 nm, 15.47 nm, and 12.52 nm for nanoparticles synthesized at pH-9, pH-10, and pH-11, respectively. Morphologically, the pH condition affects the morphology of Al2O3 nanoparticles. The reflectance spectrum peak of Al2O3 nanoparticles in the wavelength range of 328–336 nm is observed with the band gap energy of 2.92-3.01 eV. According to these results, it is believed that the Al2O3 nanoparticles have potential applications as photocatalysts. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/10067 10.55981/jsmi.2026.10067 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 71-76 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/10067/11675 Copyright (c) 2026 Anggara, Natasya Frysillia Wardani, Rahmat Setiawan Mohar, Nurfina Yudasari, Artoto Arkundato, Haris Suhendar, Hadi Nasbey, Imam Basori, Tan Swee Tiam, Iwan Sugihartono https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/10243 2025-09-01T16:12:26Z jsmi:ART

Layer Influence on Organosilica Composites Strength to Withstand the Impact of 9mm Caliber Bullets Notonegoro, Hamdan Akbar Sofyan, Muhammad Azis Rizkynawan, Benridho Soegijono, Bambang Setiawan, Jan Aritonang, Sovian Suherman, Andri Ali, Nora'aini Body armor Organo-silica Fiberglass Layer 9mm Caliber Bullets The use of steel panels in conventional bulletproof vests is no longer relevant to current needs. In addition to being heavy, troop flexibility is disrupted. It is necessary to develop lighter and more reliable composite panels. The purpose of this study was to determine the ability of organosilica resin composite panels that were given variations of 5, 7 and 9 layers of woven fiberglass to withstand 9 mm caliber bullets using the NIJ-0101.06 Standard. The results of the firing test showed that the bullets were held back in the 7th and 9th layers. This result shows that this composite is a worthy candidate to replace conventional steel panels in bulletproof vests. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/10243 10.55981/jsmi.2025.10243 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 54-59 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/10243/10587 Copyright (c) 2025 Hamdan Akbar Notonegoro, Muhammad Azis Sofyan, Benridho Rizkynawan, Prof. Dr. Bambang Soegijono, Jan Setiawan, Sovian Aritonang, Andri Suherman, Nora'aini Ali https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/10775 2025-08-31T13:32:43Z jsmi:Ed

Preface Volume 26 (2) Year 2025 Rahman, Andri BRIN Publishing (Penerbit BRIN) 2025-04-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/10775 Jurnal Sains Materi Indonesia; Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia; i-iii 2614-087X 1411-1098 10.55981/jsmi.v26i2 eng https://ejournal.brin.go.id/jsmi/article/view/10775/8386 Copyright (c) 2025 Jurnal Sains Materi Indonesia https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/11263 2025-09-01T16:12:26Z jsmi:ART

Impact of Surfactants on the Performance of Plastic Modified Bitumen: A Study on Ductility, Penetration, and Softening Point Nugraha Wahyu Pratama Mochamad Chalid Farhan Aziz Surfactants Plastic Modified Bitumen Multilayer Plastics This study explores the effect of surfactant use, namely Sorbitan Monostearate (Span 60) and Polyethylene Glycol 400 (PEG 400), on the physical and mechanical characteristics of bitumen modified with multilayer plastic. The focus of this study is to improve the compatibility between bitumen and multilayer plastic, which often have incompatible properties, thus affecting the performance of bitumen. Methodology applied includes the preparation of bitumen samples modified with varying surfactant concentrations, followed by microscopic analysis to assess particle dispersion and distribution. The results showed that the addition of surfactants significantly improved particle dispersion, with smaller particle sizes and more even distribution. Ductility tests showed that bitumen modified with surfactants had better flexibility compared to conventional bitumen, while penetration tests showed improved elasticity properties. These findings indicate that the use of surfactants in bitumen modification can improve the physical and mechanical properties of the material, providing potential for wider applications in the construction industry. Further research is recommended to explore other surfactant combinations and their impact on bitumen properties under various environmental conditions. BRIN Publishing (Penerbit BRIN) 2025-08-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/11263 10.55981/jsmi.2025.11263 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; 60-70 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/11263/10588 Copyright (c) 2025 Nugraha Wahyu Pratama, Mochamad Chalid, Farhan Aziz https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/11718 2026-02-05T01:22:31Z jsmi:ART

High Temperature Corrosion On Inconel and Carbon Steel Filler of Weldment in Liquid Pb at 800 ̊C pramutadi, asril wafda, hakimul P.M. Adi Lead-cooled Fast Reactor (LFR) Welded SS316 Inconel and 70S filler High-temperature corrosion Oxide scale This study evaluates the corrosion behavior of SS316 material welded using Inconel and 70S fillers in a static liquid lead (Pb) environment saturated with oxygen at 800 °C for 36 hours, simulating accident conditions in a lead-cooled fast reactor (LFR). Welding was carried out using laser welding (Inconel filler) and metal inert gas (MIG) (70S filler) methods, representing structural joints in the reactor. The results of scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis showed the formation of a spinel-type oxide layer (Fe-Cr-O) in both weld areas, with the laser welding sample showing deeper Pb penetration due to the porosity of the oxide layer. In contrast, in MIG welding, the oxide layer was denser with limited Pb penetration at the spinel-matrix interface. The base metal (BM) only formed a thin layer without significant oxide, but showed lower Pb penetration. These results provide critical insights into filler metal performance under extreme conditions, supporting material selection and weld design strategies for enhanced safety and longevity in next-generation lead-cooled fast reactors. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/11718 10.55981/jsmi.2026.11718 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 77-85 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/11718/11676 Copyright (c) 2026 asril pramutadi, hakimul wafda https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/12209 2026-02-05T01:22:31Z jsmi:ART

Glucose Detection Using a Surface Plasmon Resonance Biosensor Functionalized by Glucose Oxidase Qonitah, Atikah Udhiarto, Arief Pambudi, Sabar Nuryadi, Ratno Aprilia, Lia Surface plasmon resonance Glucose sensor Glucose oxidase Resonance angle shift Sensitivity Surface plasmon resonance (SPR) is a well-established optical method for biosensing, allowing real-time monitoring of biomolecular interactions without the need for labeling. In this study, an SPR biosensor was designed for glucose detection by modifying a gold thin film with a self-assembled monolayer (SAM) of 16-mercaptohexadecanoic acid (16-MHA). The SAM layer was chemically activated using (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride /N-hydroxysuccinimide (EDC/NHS), enabling covalent attachment of glucose oxidase (GOx) for selective interaction with glucose molecules. The sensor was tested with glucose solutions at various concentrations (100–300 mM) and corn syrup, which contains both glucose and fructose, to evaluate selectivity. Detection relied on measuring shifts in the resonance angle of the attenuated total reflection curve, which reflects changes in the local refractive index. The sensor exhibited a clear linear correlation between glucose concentration and resonance angle shift, indicating high sensitivity. In contrast, corn syrup produced much smaller shifts, confirming the selectivity of the biosensor due to GOx’s specificity for β-D-glucose. Performance evaluation showed higher sensitivity (S), narrower full width at half maximum (FWHM), and superior figure of merit (FOM) for glucose compared to corn syrup. These results highlight the potential of SPR for reliable and selective glucose detection in biomedical fields. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/12209 10.55981/jsmi.2026.12209 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 86-97 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/12209/11677 Copyright (c) 2026 Atikah Qonitah, Arief Udhiarto, Sabar Pambudi, Ratno Nuryadi, Lia Aprilia https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/12227 2026-02-05T01:22:31Z jsmi:ART

Enhanced Co₂ Adsorption Using Activated Carbon From Tea Stem Waste Via Activation–Carbonization Strategy Supriadi, Edi Efriyana Kampai Muhdarina Joni Prasetyo Yessie Widya Sari Tanti Ardiyati Ary Mauliva Hada Putri Activated carbon Tea stem waste Activation-carbonization CO2 adsorption Surface characterization Tea stem agroindustrial waste, rich in cellulose, hemicellulose, and lignin, presents a promising low-cost precursor for sustainable activated carbon production. This study explores the activation–carbonization approach for synthesizing porous activated carbon and evaluates its effectiveness for CO₂ capture. Chemical activation was conducted using 60% w/v KOH at different activator-to-precursor ratios (0.5:1, 1:1, and 2:1 v/w), followed by carbonization at 250°C, 350°C, and 450°C in a fixed-bed pyrolysis reactor under nitrogen atmosphere. Among all samples, A1-450 0.5 (450°C, 0.5:1 ratio) exhibited the highest CO2 adsorption capacity (1.9500 mmol g⁻¹), attributed to its high surface area (679.4 m² g⁻¹) and predominantly microporous structure. XRD analysis confirmed the presence of disordered graphitic domains with broad peaks at 2θ = 22° and 44°, while FTIR revealed abundant surface functional groups (OH, C=C, CO) essential for CO2 interactions. SEM-EDX characterization showed a heterogeneous porous surface and high carbon content (78.23%). These findings demonstrate that the activation–carbonization route is more effective than carbonization–activation in producing high-performance bio-based CO₂ adsorbents, offering a viable strategy for valorizing agro-waste into functional carbon materials BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/12227 10.55981/jsmi.2026.12227 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 98-106 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/12227/11678 Copyright (c) 2026 Edi Supriadi, Efriyana Kampai, Muhdarina, Joni Prasetyo, Yessie Widya Sari, Tanti Ardiyati, ary mauliva hada putri https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/13109 2026-02-05T01:22:31Z jsmi:ART

Synthesis and Characterization of Biocompatible Facial Sheet Masks Utilizing Ginger Cellulose and Jicama Starch Nisazarifa, Adristi Mardiyati, Yati Steven, Steven Sheet mask Cellulose Starch Ginger Jicama Sheet masks are one of the most widely used beauty products to improve skin health. The increase in sheet mask usage leads to an increase in its waste, while some of the sheet masks contain synthetic fibers that are not biodegradable in the environment. Many researchers have been interested in innovating sheet masks by using natural polymer materials. Starch and cellulose were chosen because they are potentially environmentally friendly and biocompatible products. The solution casting method is used to produce sheet masks. Ginger cellulose and jicama starch were mixed, and the mass ratios of cellulose and starch are 100:0, 100:20, 100:40, 100:60, and 100:80. The addition of starch to cellulose tends to decrease the tensile strength and increase the percent elongation of the sample. The sample with a 100:0 ratio had the highest tensile strength at 34.75 MPa, while the highest percent elongation was achieved by the sample with a 100:40 ratio, measuring 4.80%. The absorption index of the sample to serum decreased with increasing starch composition. Samples with a mass ratio of cellulose to starch of 100:0, 100:20, and 100:40 exhibited better biodegradability than commercial sheet masks. Most of the samples undergo 100% biodegradation after 12 days of the biodegradation test. This research aims to develop a sheet mask made from ginger cellulose and jicama starch, which has flexible properties that allow it to conform to the shape of the face while also effectively absorbing serum or essence. This research can be used as an alternative for choosing sheet mask materials as a way to reduce plastic waste. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/13109 10.55981/jsmi.2026.13109 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 107-116 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/13109/11679 Copyright (c) 2026 Adristi Nisazarifa, Yati Mardiyati, Steven Steven https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/13411 2025-09-01T16:12:26Z jsmi:Ed

Preface Volume 27 (1) Year 2025 Rahman, Andri BRIN Publishing (Penerbit BRIN) 2025-08-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/13411 Jurnal Sains Materi Indonesia; Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia; i-iii 2614-087X 1411-1098 10.55981/jsmi.v27i1 eng https://ejournal.brin.go.id/jsmi/article/view/13411/10593 Copyright (c) 2025 Jurnal Sains Materi Indonesia https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/13450 2026-02-05T01:22:31Z jsmi:ART

Characteristics and Photocatalytic Performance of Coprecipitation Praseodymium (Pr)-doped Strontium Titanate for Methylene Blue Degradation Khoiria, Salsa Nurul Sandi, Dianisa Khoirum Nurosyid, Fahru Suryana, Risa Iriani, Yofentina strontium titanate praseodymium doping photocatalyst mb dye Photodegradation Strontium titanate (SrTiO₃ or STO) is a perovskite material with promising photocatalytic properties for wastewater degradation. Doping with rare-earth elements such as praseodymium (Pr) can enhance its performance by modifying structural and electronic characteristics. In this study, Pr-doped STO (Sr1-xPrxTiO3, x = 0%, 2%, and 4%) was synthesized via the coprecipitation method. X-ray diffraction (XRD) confirmed a single-phase perovskite structure with high crystallinity, while Fourier transform infra-red (FTIR) analysis verified the formation of Sr–Ti–O bonds. Particle size analysis (PSA) and surface area analysis (SAA) with the Brunauer-Emmett-Teller (BET) method revealed that higher Pr concentrations reduced particle size and increased surface area. Photocatalytic activity was evaluated using methylene blue (MB) degradation under ultraviolet (UV) irradiation for up to 5 hours. The Sr0.98Pr0.02TiO3 sample exhibited the best performance, achieving 73.08% MB degradation after 5 hours, demonstrating the effectiveness of moderate Pr doping in enhancing photocatalytic activity BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/13450 10.55981/jsmi.2026.13450 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 117-126 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/13450/11680 Copyright (c) 2026 Salsa Nurul Khoiria, Dianisa Khoirum Sandi, Fahru Nurosyid, Risa Suryana, Yofentina Iriani https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/14209 2026-02-05T01:22:31Z jsmi:ART

Density and Tensile Properties Analysis of Biocomposite from Lid Film Waste and Oil Palm Empty Fruit Bunch Fiber Farishi, Salman Mawaddah, Siti Mutia Chalid, Mochamad Zulys, Agustino Ghozali, Muhammad Lid Film Waste OPEFB Fiber Biocomposite Wood Polymer Composite Tensile Strength Multilayer plastic waste, particularly from the bottled water industry, represents a persistent challenge in current plastic waste management strategies. Simultaneously, oil palm empty fruit bunch (OPEFB) waste, though often discarded, possesses significant potential for sustainable material development. This study explores the utilization of both waste streams as raw materials for biocomposite fabrication, thereby addressing environmental concerns while reducing dependence on virgin polymer resources. The multilayer lid film waste (comprising PET, LDPE, and LLDPE) and OPEFB fibers were processed through crushing, sieving, and extrusion to form pellets with varying OPEFB fiber loadings (30%, 50%, and 70% by weight). The resulting biocomposite was characterized using FTIR, XRD, SEM, density measurements, and tensile testing. The biocomposite containing 70% OPEFB exhibited the slowest degradation but also the lowest crystallinity (10.84%). In contrast, the 30% OPEFB composite showed the highest tensile strength (16.86 MPa) and elongation at break (3.23 MPa). SEM analysis revealed that a higher fiber content increased the porosity within the composite matrix. These findings demonstrate the potential of combining multilayer plastic and OPEFB waste for biocomposite applications, contributing to both material innovation and environmental sustainability. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/14209 10.55981/jsmi.2026.14209 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 128-135 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/14209/11681 Copyright (c) 2026 Salman Farishi, S.M. Mawaddah, M. Chalid, A. Zulys, Muhammad Ghozali https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/14276 2026-02-05T01:22:31Z jsmi:ART

Physical and Mechanical Properties of Chitosan Bioplastics with Ramie Fiber Concentration Variations Jamilah, Umi Sujito N. Hidayatillah E. Hidayah Bioplastics Chitosan Ramie Fiber Mechanical Properties Water Absorption Bioplastics are biodegradable materials derived from natural polymers such as starch, cellulose, lignin, or chitosan and are considered sustainable alternatives to conventional plastics. In this study, chitosan-based bioplastics were prepared using chitosan extracted from fish scales and reinforced with alkali-treated ramie fibers. Chitosan was dissolved in 1% acetic acid at 50 °C for 4 h, followed by the addition of 5% citric acid and ramie fibers at various contents (15%, 20%, 25%, and 30% relative to chitosan mass), and stirred for an additional hour. The resulting bioplastics were characterized for tensile strength, elastic modulus, water absorption, and surface morphology using SEM. The results indicate that ramie fiber content significantly influences the mechanical and physical properties of the bioplastics. Increasing the fiber content generally enhances tensile strength and reduces water absorption; however, excessive fiber loading can lead to performance deterioration. The optimum formulation was achieved at 25% ramie fiber, exhibiting a tensile strength of 39.60 MPa, an elastic modulus of 43.35 MPa, and a reduction in water absorption of approximately 43% compared to fiber-free bioplastics, along with a more homogeneous surface structure. These findings demonstrate that ramie fiber reinforcement effectively improves the performance of chitosan-based bioplastics. BRIN Publishing (Penerbit BRIN) 2026-02-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://ejournal.brin.go.id/jsmi/article/view/14276 10.55981/jsmi.2026.14276 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; 136-143 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/14276/11682 Copyright (c) 2026 Umi Jamilah, Sujito, N. Hidayatillah, E. Hidayah https://creativecommons.org/licenses/by-sa/4.0

oai:ejournal.brin.go.id:article/15183 2026-02-05T01:22:31Z jsmi:Ed

Preface Volume 27 (2) Year 2026 Rahman, Andri Materials science and technology development plays an active role in several fields of life including medicine, infrastructure, energy, computational material science, and others. Researchers and academics are at the forefront of this development. Indonesia Journal of Materials Science ( JUSAMI) was founded to represent their needs, which are now widely recognized as an integral part of scientific and characterization investigations. JUSAMI Vol. 27 No. 2, Year   2026 is proudly published several paper entitled: 1) The Influence of pH on Structural, Morphological, and Optical Properties of Al2O3 Nanoparticles Synthesized by Syzygium aromaticum Leaf Extract; 2) High Temperature Corrosion On Inconel and Carbon Steel Filler of Weldment in Liquid Pb at 800 ̊C; 3) Glucose Detection Using a Surface Plasmon Resonance Biosensor Functionalized by Glucose Oxidase; 4) Enhanced Co₂ Adsorption Using Activated Carbon From Tea Stem Waste Via Activation–Carbonization Strategy;  5) Synthesis and Characterization of Biocompatible Facial Sheet Masks Utilizing Ginger Cellulose and Jicama Starch; 6) Characteristics and Photocatalytic Performance of Coprecipitation Praseodymium (Pr)-doped Strontium Titanate for Methylene Blue Degradation; 7) Density and Tensile Properties Analysis of Biocomposite from Lid Film Waste and Oil Palm Empty Fruit Bunch Fiber; 8) Physical and Mechanical Properties of Chitosan Bioplastics with Ramie Fiber Concentration Variations. BRIN Publishing (Penerbit BRIN) 2026-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://ejournal.brin.go.id/jsmi/article/view/15183 Jurnal Sains Materi Indonesia; Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia; i-iii 2614-087X 1411-1098 10.55981/jsmi.v27i2 eng https://ejournal.brin.go.id/jsmi/article/view/15183/11683 Copyright (c) 2026 Jurnal Sains Materi Indonesia https://creativecommons.org/licenses/by-sa/4.0