Importance of the surface viscosity on the relaxation of an imposed deformation in a nematic liquid crystal cell

被引:8
|
作者
Barbero, Giovanni [1 ]
Lenzi, Ervin Kaminski [1 ,2 ]
机构
[1] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy
[2] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil
关键词
ORIENTATIONAL DYNAMICS; REORIENTATION; ADSORPTION;
D O I
10.1016/j.physleta.2010.01.046
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We analyze the influence of the surface viscosity on the relaxation of the nematic deformation induced by an external field on a nematic cell, when the distorting field is removed. The analysis is performed by assuming that the anchoring energy describing the anisotropic part of the nematic-substrate surface tension can be approximated by the form proposed by Rapini and Papoular, and that the viscous torque at the surface is characterized by a surface viscosity eta(s). We consider a simple situation where by means of an external action the surface easy direction is modified, and investigate the evolution of the nematic orientation, from the initial state to the final one. The Green function approach is used to obtain the exact solution for the tilt angle profile. The results show that the surface viscosity modifies the relaxation process which becomes slower for increasing values of eta(s). (C) 2010 Elsevier By. All rights reserved.
引用
收藏
页码:1565 / 1569
页数:5
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