Temperature- and electric-field-induced inverse Freedericksz transition in a nematogen with weak surface anchoring

Arun Kumar, T. ; Sathyanarayana, P. ; Sastry, V. S. S. ; Takezoe, Hideo ; Madhusudana, N. V. ; Dhara, Surajit (2010) Temperature- and electric-field-induced inverse Freedericksz transition in a nematogen with weak surface anchoring Physical Review E, 82 (1). 011701_1-011701_6. ISSN 1063-651X

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Official URL: http://pre.aps.org/abstract/PRE/v82/i1/e011701

Related URL: http://dx.doi.org/10.1103/PhysRevE.82.011701

Abstract

We report electric field dependence of the anchoring transition in a mesogen on cooling in a cell with perfluoropolymer treated surfaces. Below a crossover voltage Vco the transition is discontinuous between planar and homeotropic alignments, and as the temperature is lowered, the transition temperature decreases quadratically with the field. Above Vco the transition is continuous between planar and tilted alignments, the transition temperature decreasing essentially linearly with the rms field. We develop a simple model to account for these results and argue that the higher field regime corresponds to a temperature driven inverse Freedericksz transition in which the director orientation starts tilting at the weakly anchored surfaces while the tilt angle remains zero at the midplane of the cell.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:21108
Deposited On:20 Nov 2010 09:09
Last Modified:07 Jun 2011 04:54

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