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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:31 |
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Conference: Bucharest University Faculty of Physics 2007 Meeting
Section: Polymer Physics
Title:
Electrohydrodynamic Instability in a Nematic Liquid Crystal Doped with a Cholesteric One
Authors:
Lucian Georgescu, Cristina Miron, Emil Barna
Affiliation:
University of Bucharest, Faculty of Physics, POB MG – 11, Romania
E-mail
cmiron_2001@yahoo.com
Keywords:
electroconvection, negative dielectric anisotropy, cholesteric dopant
Abstract:
We investigated electroconvection in a cholesteric liquid crystal with negative dielectric anisotropy, that is, a mixture of MBBA (p – methoxy benzilidene p - n butylaniline) with a small amount of a cholesteric dopant CN (cholesteryl nonanoate). By changing the coresponding helical pitch by varying the concentration of CN, a variety of ac-driven convective patterns are found in sandwiched cells. The pitch and temperature dependences of their threshold voltages and characteristic wavelength of the patterns are systematically studied.
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