HIGH-RESOLUTION CALORIMETRIC STUDY OF THE ANTIFERROELECTRIC LIQUID-CRYSTALS METHYLHEPTYLOXYCARBONYLPHENYL OCTYLOXYBIPHENYL CARBOXYLATE AND ITS OCTYLCARBONYLBIPHENYL ANALOG

被引：51

作者：

EMA, K

YAO, H

KAWAMURA, I

CHAN, T

GARLAND, CW

机构：

[1] SHOWA SHELL SEKIYU KK, CENT RES & DEV LAB, ATSUGI, KANAGAWA 24302, JAPAN

[2] MIT, DEPT CHEM, CAMBRIDGE, MA 02139 USA

[3] MIT, CTR MAT SCI & ENGN, CAMBRIDGE, MA 02139 USA

来源：

PHYSICAL REVIEW E | 1993年 / 47卷 / 02期

关键词：

D O I：

10.1103/PhysRevE.47.1203

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The antiferroelectric smectic-C* (Sm-C*) phases of two closely related chiral compounds have been studied with high-resolution calorimetric techniques. Both methylheptyloxycarbonylphenyl octyloxybiphenyl carboxylate (MHPOBC) and its octylcarbonylbiphenyl analog (MHPOCBC) exhibit Sm-C(alpha)* and Sm-C(A)* antiferroelectric phases. The Sm-A-Sm-C(alpha)* transitions are mean-field second order and well described by the usual extended Landau model. Three restructuring Sm-C* transitions in MHPOBC studied with a relaxation calorimeter are shown to be sharp first-order transitions with very small latent heats. Pretransitional heat capacity associated with the Sm-C(A)*-Sm-I(A)* (hexatic smectic-I(A)*) transition and freezing of the monotropic Sm-C(A)* phase was studied in MHPOCBC.

引用

页码：1203 / 1211

页数：9

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