IDENTIFIKASI FASA FEROELEKTRIK PADA KRISTAL CAIR EP10PBNP

Abstract

IDENTIFIKASI FASA FEROELEKTRIK PADA KRISTAL CAIR EP10PBNP. Telah dilakukan pengukuran tetapan dielektrik kristal cair 1-ethylpropyl (S)-2-{6-[4-(4’-decyloxyphenyl) benzoyloxyl]-2-naphthyl} propionate (EP10PBNP) untuk mengidentifikasi fasa serta mempelajari dinamika molekulnya di sekitar daerah transisi fasa, yaitu dari fasa smektik-A (SmA) ke fasa lain yang berada di bawah suhu transisi. Dari hasil analisis diperoleh bahwa fasa feroelektrik smektik-C* (SmC*) terbentuk di bawah fasa SmA. Di samping itu, telah diperoleh hubungan antara frekuensi relaksasi dari ferroelectric soft mode dan ferroelectric goldstone mode terhadap suhu. Perubahan frekuensi relaksasi ferroelectric soft mode pada fasa SmA mengikuti hukum Curie-Weiss.

ABSTRACT

FERROELECTRIC PHASE IDENTIFICATION OF LIQUID CRYSTAL EP10PBNP. Dielectric constant measurements have been performed to identify the phase and to study the liquid crystal dynamics near the phase transition from smectic-A (SmA) phase to lower temperature phase of a liquid crystal compound 1-ethylpropyl (S)-2-{6-[4-(4’-decyloxyphenyl) benzoyloxyl]-2-naphthyl} propionate (EP10PBNP). Analysis results show that ferroelectric smectic-C* (SmC*) phase was formed under the SmA phase. The temperature dependence of relaxation frequency of ferroelectric soft mode and ferroelectric Goldstone mode was also obtained. The change of relaxation frequency with temperature in SmA phase obeys the Curie-Weiss law.