The determination of molecular parameters from dielectric measurements on nematic liquid crystals


Dunmur, D.A. (2005) The determination of molecular parameters from dielectric measurements on nematic liquid crystals. Liquid Crystals, 32, (11-12), 1379-1387. (doi:10.1080/02678290500124684).

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Description/Abstract

bThe physical properties of liquid crystal phases (mesophases) depend in a very sensitive manner on the structure of the constituent liquid crystal-forming molecules (mesogens). Thus a small change in molecular structure can result in a dramatic change in the corresponding liquid crystal properties. The dielectric responses of materials reflect the electric properties of molecules, and so analysis of dielectric measurements on liquid crystals in terms of molecular properties should lead to the development of structure/property relationships for such mesophases. This paper explores the problems of determining molecular parameters from dielectric measurements on nematic liquid crystals. Specifically, the difficulties in defining the internal electric field and knowing the value of the order parameter are addressed. Experimental results on a range of liquid crystals show that short range correlations are important in determining both the dielectric and optical response of nematic liquid crystals. It is concluded therefore that more sophisticated molecular theories, which take account of molecular shape and volume, need to be developed before reliable structure/property relationships can be established for liquid crystals.

Item Type: Article
ISSNs: 0267-8292 (print)
Related URLs:
Keywords: dipole association, light-scattering, relaxation, theorie, mesogens, systems, solvent, phase, field
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 44426
Date Deposited: 01 Mar 2007
Last Modified: 27 Mar 2014 18:28
URI: http://eprints.soton.ac.uk/id/eprint/44426

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