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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 14:56 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Polymer Physics
Title:
Nonlinear Study of Electroconvective in Nematic I52
Authors:
L. Georgescu(1), Cristina Miron(1), Beatris Neacsu(2)
Affiliation:
1 University of Bucharest -Faculty of Physics, Bucharest - Magurele, 077125, Romania
2 CMRID, Horia Hulubei National Institute of Physics and Nuclear Engineering - IFIN HH, Bucharest - Magurele, 76900, Romania
E-mail
cmiron_2001@yahoo.com
Keywords:
the nematic liquid crystal, nonlinear electrohidrodynamic instabilities
Abstract:
In this paper measurements of thermally - induced mean square director angle fluctuactions both far below and very close to the primary supercritical bifurcation to electroconvection of the nematic liquid crystal I52.
Closer to the bifurcation there are deviation from linear theory with a smaller γ and with critical amplitude of the applied alternanting voltage more as mean fluctuations of critical amplitude. For the nematic liquid crystal I52 measurements as a function of the conductivity σ of square director angle fluctuactions above critical amplitude suggest a tricritical bifurcation and control parameter increases strongly as σ is approached from above.
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