A shear-induced instability in freely suspended smectic-A liquid-crystal films

被引：8

作者：

Dash, D

Wu, XL

机构：

[1] Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.79.1483

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

This experiment examines the stability of a smectic-A liquid-crystal film subject to a uniform shear flow with velocity and velocity gradient in the plane of the smectic layers. The experiment is made possible by virtue of a freely suspended liquid-crystal film which is sheared at its edge by a Couette apparatus. It was found that while there was no shear-induced phase transition, line defects were nucleated in the film when the shear rate gamma attained a certain threshold. The critical shear rate gamma(c) was measured as a function of temperature and film thickness.

引用

页码：1483 / 1486

页数：4

共 18 条

[1]

BOLTENHAGEN P, 1991, J PHYS II, V1, P1233, DOI 10.1051/jp2:1991130

[2] LANDAU THEORY OF THE NEMATIC SMECTIC-A PHASE-TRANSITION UNDER SHEAR-FLOW [J].