Control of the nematic-isotropic phase transition by an electric field

MOTTRAM, N. J., CARE, C. M. and CLEAVER, D. J. (2006). Control of the nematic-isotropic phase transition by an electric field. Physical Review E, 74 (4).

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Link to published version:: 10.1103/PhysRevE.74.041703

Abstract

We use a relatively simple continuum model to investigate the effects of dielectric inhomogeneity within confined liquid-crystal cells. Specifically, we consider, in planar, cylindrical, and spherical geometries, the stability of a nematic-isotropic interface subject to an applied voltage when the nematic liquid crystal has a positive dielectric anisotropy. Depending on the magnitude of this voltage, the temperature, and the geometry of the cell, the nematic region may shrink until the material is completely isotropic within the cell, grow until the nematic phase fills the cell, or, in certain geometries, coexist with the isotropic phase. For planar geometry, no coexistence is found, but we are able to give analytical expressions for the critical voltage for an electric-field-induced phase transition as well as the critical wetting layer thickness for arbitrary applied voltage. In cells with cylindrical and spherical geometries, however, locally stable nematic-isotropic coexistence is predicted, the thickness of the nematic region being controllable by alteration of the applied voltage.

Item Type: Article
Additional Information: Part 1
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Materials and Fluid Flow Modelling Group
Identification Number: 10.1103/PhysRevE.74.041703
Depositing User: Hilary Ridgway
Date Deposited: 09 Apr 2010 15:49
Last Modified: 29 Sep 2010 10:53
URI: http://shura.shu.ac.uk/id/eprint/1528

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