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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:32 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Polymer Physics
Title:
Electroconvection in a Homeotropic Nematic Liquid Crystal
Authors:
Lucian Georgescu, Emil Barna, Cristina Miron, Beatrice Savu
Affiliation:
University of Bucharest, Faculty of Physics, POB MG – 11, Romania
E-mail
cmiron_2001@yahoo.com
Keywords:
Nematic Liquid Crystal, Electrohydrodinamic Instabilities
Abstract:
Electroconvection patterns have been studied in a homeotropic nematic liquid crystal, experimental and theoretical, with unusual combination of material parameters, negativ conductivity and positive dielectric permitivity anisotropies.
Exploring the complete phase diagram in the (U, q ) space three distinct morphologies, rolls and squares, soft squares and hard squares have been identified.
We perform a linear and nonlinear analysis of the full nematohydrodynamic equations and carry out simulations of a suitably constructed Lorenz model. We obtain in agreement with the experiments modulated rolls and squares at threshold.
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