Paper Title:
An Optical Study on Orientational Order Parameter and Molecular Polarizability in Benzylidene Anilines
  Abstract

Refractive indices measurements are carried out in four alkoxy benzylidene anilines viz., N-(p-n-methoxy and ethoxy benzaldehyde)-p-n-dodecyl and tetra decyl anilines, 1O.12, 1O.14, 2O.12 and 2O.14. First three compounds exhibit monovariant nematic phase while the last compound exhibits nematic and SmA phases with variable thermal ranges. The molecular polarizabilities are calculated from the refractive indices and the density using the well known internal field models by Vuks and Neugebauer. The molecular polarizability anisotropy is estimated from the Lippincott δ-function model as well as molecular vibrational methods. The order parameter is estimated using a) from the Haller’s extrapolation from molecular polarizabilities, b) from the scaling factors obtained from the equations by Vuks and Neugbeaur and c) directly from the birefringence - a method developed by Kuczynski et al without considering any internal field model to the liquid crystal molecule. The results evaluated from these methods are compared from one another and the limitations of the methods used are discussed.

  Info
Periodical
Solid State Phenomena (Volumes 181-182)
Chapter
I. Physics of Liquid Crystals
Edited by
Yuan Ming Huang
Pages
102-105
DOI
10.4028/www.scientific.net/SSP.181-182.102
Citation
M. R. N. Rao, P.V. D. Prasad, V.G.K.M. Pisipati, D. M. Latha, "An Optical Study on Orientational Order Parameter and Molecular Polarizability in Benzylidene Anilines", Solid State Phenomena, Vols. 181-182, pp. 102-105, 2012
Online since
November 2011
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Price
$32.00
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