Prakash, Jai and Chandran, Achu and Malik, Anu and Biradar, Ashok M. (2015) Role of cell thickness in tailoring the dielectric and electro-optical parameters of ferroelectric liquid crystals. Liquid Crystals, 42 (12). pp. 1748-1753. ISSN 0267-8292

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Abstract

Here, we report thickness dependence of dielectric and electro-optical parameters in ferroelectric liquid crystals (FLCs) without surface stabilisation. The dependence of dielectric and electro-optical parameters on cell thickness is observed by dielectric spectroscopy and electro-optical measurements. The dielectric permittivity (epsilon') measured by varying the cell thickness showed increase of epsilon' with increase of cell thickness which is attributed to the presence of more ions and larger contributions of Goldstone mode in thick cells. The spontaneous polarisation also shows increment with increase of cell gap up to certain thickness range. The rotational viscosity decreases with increase in the cell thickness whereas the response time is more for thicker cells. The decrease in the rotational viscosity is attributed to lowering of elastic deformation with increase in cell thickness and the response time is directly proportional to cell gap. These studies would be utilised to understand the effect of cell thickness on dielectric and electro-optical properties of FLC materials and optimising the material parameters with cell thickness for better and efficient liquid-crystal-based devices.

Item Type:	Article
Uncontrolled Keywords:	ferroelectric liquid crystal; dielectric permittivity; spontaneous polarisation; rotational viscosity; response time; cell thickness
Subjects:	Chemistry Crystallography Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	06 Oct 2016 07:12
Last Modified:	24 Oct 2016 10:44
URI:	http://npl.csircentral.net/id/eprint/1974

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