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The electroconvection in dimeric nematic liquid crystals

M. PETROV1,* , B. KATRANCHEV1, KESKINOVA1, H. NARADIKIAN1

Affiliation

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria

Abstract

The electroconvection (EC) in nematics with short range smectic C order, scanning both the high-temperature nematic region (N1) and the low-temperature one (N2), differentiated by a definite temperature T∗, was investigated. The influence of the change of the magnitude and the sign of the electroconductivity, σa, anisotropy, as well as the influence of the director n positions (both driven by temperature variation), on the EC mechanism and the corresponding optical patterns are discussed. The isotropic character of the EC instability initiated by the ‘loss’ of electroconductivity anisotropy below T*, and in the vicinity of the nematic-isotropic phase transition, is discussed..

Keywords

Liquid Crystals, Dimeric nematics, Electroconvection.

Submitted at: Nov. 28, 2006
Accepted at: Feb. 15, 2007

Citation

M. PETROV, B. KATRANCHEV, KESKINOVA, H. NARADIKIAN, The electroconvection in dimeric nematic liquid crystals, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 438-441 (2007)