Role of molecular dipoles in liquid crystals

Madhusudana, N. V. (2004) Role of molecular dipoles in liquid crystals Molecular Crystals and Liquid Crystals, 409 . pp. 371-387. ISSN 1058-725X

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A vast majority of compounds exhibiting liquid crystalline phases have polar molecules. The nematic director is apolar, even when the molecules have cyano or nitro end-groups, as neighbouring molecules tend to have an antiparallel short-range order. This leads to a partial bilayer structure in the smectic A phase of rod-like molecules as also many interesting phase transitions. The latter can be understood on the basis of a change over to a polar short-range order as the density of the medium is increased. If the molecules have bent-cores and cyano end-groups, a partial bilayer biaxial smectic A phase is also found, implying the formation of quartets with an apolar structure. Lateral dipolar components lead to a tilting of molecules in smectic phases. This can be understood on the basis of the off-axis locations of such dipoles. A mean field theory of smectic C liquid crystals based on this mechanism gives results which reflect experimental trends. In appropriate cases, the possibility of occurrence of a cone-phase consisting of double-tilt cylinders is also pointed out.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Ltd.
Keywords:Antiparallel Short-range Order; Biaxial Smectic A Phase; Cone Phase; Polar Molecules; Polar Short-range Order; Smectic C Liquid Crystals
ID Code:20774
Deposited On:20 Nov 2010 13:35
Last Modified:17 May 2016 05:02

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