近晶A相液晶界面失稳和模式选择

罗飞; 李剑峰; 刘仓理; 张大勇

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近晶A相液晶界面失稳和模式选择

材料物理和化学 | 更新时间：2020-08-12

- 近晶A相液晶界面失稳和模式选择
- Interface Instability and Pattern Selection in Smectic-A Liquid Crystals
- 液晶与显示 2010年25卷第5期页码：640-645
- 作者机构：
  
  中国工程物理研究院流体物理研究所, 四川绵阳 621900,E-mail:caep.luofel@gmail.com
- 作者简介：
- 基金信息：
  
  中国工程物理研究院重点基金资助项目(No.2007A01003)();十一五"();预研项目(No.426020605)()
- DOI：
  中图分类号： O753+.2
- 收稿日期：2010-02-08，
  
  修回日期：2010-03-09，
  
  网络出版日期：2010-09-28，
  
  纸质出版日期：2010-10-20
- 稿件说明：
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罗飞, 李剑峰, 刘仓理, 张大勇. 近晶A相液晶界面失稳和模式选择[J]. 液晶与显示, 2010,25(5): 640-645

LUO Fei, LI Jian-feng, LIU Cang-li, ZHANG Da-yong. Interface Instability and Pattern Selection in Smectic-A Liquid Crystals[J]. 液晶与显示, 2010,25(5): 640-645
罗飞, 李剑峰, 刘仓理, 张大勇. 近晶A相液晶界面失稳和模式选择[J]. 液晶与显示, 2010,25(5): 640-645 DOI：

LUO Fei, LI Jian-feng, LIU Cang-li, ZHANG Da-yong. Interface Instability and Pattern Selection in Smectic-A Liquid Crystals[J]. 液晶与显示, 2010,25(5): 640-645 DOI：

摘要

近晶A相液晶从均匀的各向同性相中萌生时

其平直界面失稳后选择具有正弦周期的界面模式作为演化路径。采用偏振光成像的方法测量了几种液晶界面失稳后所选模式的周期。把界面模式作为变量

以模式的能量泛函积分为作用量

构建模式选择的唯象模型

通过数值计算在全域内找到使作用量最小的波数

这个波数可反映近晶A相液晶界面失稳后实际选择的界面模式的特征。

Abstract

A flat interface between liquid crystals and isotropic is often unstable when driven away from its equilibrium state. Some transient patterns will be observed at the early stage of the progress. Sinusoidal patterns are observed and measured with polarized microscope in smectic-A liquid crystals growing from uniform isotropic. A phenomenological model of pattern selection is built in the principle of action which produced by integrating over the energy functional. The global minimum wave number can be found by numerical calculation and reflect the characteristics of the actual selected interface pattern.

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