Influence of Optical Purity on Stability of Chiral Smectic-C Phase in Antiferroelectric Liquid Crystal under Pressure

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概要

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• The complex dielectric constants of 4-(1-methylheptyloxycalbonyl) phenyl 4$'$-octyloxybiphenyl-4-carboxylate (MHPOBC) with different optical purities ($R:S = 6:4$, $9:1$) were measured under pressure. In MHPOBC ($R:S=6:4$, 20%ee), the temperature width of the chiral smectic-C (SmC*) phase increased with pressure. On the other hand, the temperature width of the SmC* phase in MHPOBC ($R:S=9:1$, 80%ee) was almost independent of pressure at low pressures, but the SmC* phase vanished above 100 MPa. The chiral smectic-C_\alpha (SmC_\alpha*) phase instead of the SmC* phase widened at 150 MPa. From these results, including those of previous studies, the SmC* phase widened with pressure when the optical purity was below 50%ee and vanished under pressure when the optical purity was above 80%ee. It is suggested that the disappearance of the SmC* phase under pressure is related to the appearance of the SmC_\alpha* phase at atmospheric pressure.

• 2011-09-25

著者

• Uehara Hiroyuki

  Division of General Education, Aichi Gakuin University, Nisshin, Aichi 470-0195, Japan

関連論文

• Influence of Optical Purity on Stability of Chiral Smectic-C Phase in Antiferroelectric Liquid Crystal under Pressure
• Characteristic Pressure Dependence of Spontaneous Polarization in Ferroelectric Liquid Crystal
• Pressure–Temperature Phase Diagram of Antiferroelectric Liquid Crystal

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