Patterns of electroconvection in a nematic liquid crystal

被引：50

作者：

Dennin, M ^{[1
]}

Cannell, DS

Ahlers, G

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Ctr Nonlinear Sci, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW E | 1998年 / 57卷 / 01期

关键词：

D O I：

10.1103/PhysRevE.57.638

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：

We present a survey of pattern formation in electroconvection of the nematic liquid crystal 4-ethyl-2-fluoro-4'-[2-(trans-4-pentylcyclohexyl)-ethyl] biphenyl (I52) as a function of three control parameters: the applied voltage, applied frequency, and electrical conductivity of the sample. The patterns are dominated by oblique-roll states. Over the lower range of conductivity, the initial transition is a supercritical Hopf bifurcation which leads to four degenerate modes: right-and left-traveling zig and zag rolls. For higher values of the conductivity, the primary instability is a subcritical bifurcation to a single set of stationary oblique rolls. The convecting states exhibit a rich variety of patterns as a result of the interactions between the four modes, including states of spatiotemporal chaos and localized states.

引用

页码：638 / 649

页数：12