Helical superstructure from an achiral banana-shaped liquid crystal

被引：27

作者：

Lee, CK

Chien, LC ^{[1
]}

机构：

[1] Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA

[2] Gyeongsang Natl Univ, Dept Chem, Chinju 660701, South Korea

[3] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA

来源：

FERROELECTRICS | 2000年 / 243卷 / 1-4期

关键词：

helical; achiral; banana-shaped; liquid crystals;

D O I：

10.1080/00150190008008024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the banana-shaped achiral molecular system reported here, 1,3-phenylene bis[4-(3-chloro-4-n-octyloxy-phenyliminomethyl) benzoate] (PBCOB) and 1,3-phenylene bis[4-(3-fluoro-4-n-octyloxy-phenyliminomethyl) benzoate] (PBFOB), their smectic mesophases, including a switchable banana phase B-7, Were identified by differential scanning calorimetry (DSC), X-ray scattering and polarizing optical microscopy (POM) studies. Both the left- and right-handed helical domains are spontaneously formed upon cooling from isotropic liquid to the switchable banana phase (B7) The homeotropic alignment and ferroelectric properties of banana-shaped liquid crystal are investigated. The spontaneous polarization for PBCOB is about 50 nC/cm(2). Doping the PBCOB with a cyanohydrin-contain chiral smectic liquid crystal resulted in more right-handed helical structures.

引用

页码：231 / +

页数：8

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