Orientational order in three nO.m liquid crystalline compounds

Refractive index and density measurements have been carried out on three nO.m liquid crystalline compounds, namely, 4O.2, 4O.3 and 1O.10 belonging to the N-(p-n-alkoxybenzylidene)-p-n-alkylaniline series. From the data, the orientational order parameter has been estimated using Vuks and Neugebauer l...

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Bibliographic Details
Published in:Phase transitions 2015-04, Vol.88 (4), p.383-395
Main Authors: Usha, M.K., Pardhasaradhi, P., Vinutha, N., Revannasiddaiah, D.
Format: Article
Language:English
Subjects:
birefringence
crossover temperature
Crossovers
Crystallography
density
Geometry
Liquid crystals
Mathematical models
Nematic
nO.m series
Optical properties
Order parameters
orientational order parameter
Parameter estimation
Phase transformations
Phase transitions
Refractive index
Refractivity
Temperature effects
Thermodynamics
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Summary:Refractive index and density measurements have been carried out on three nO.m liquid crystalline compounds, namely, 4O.2, 4O.3 and 1O.10 belonging to the N-(p-n-alkoxybenzylidene)-p-n-alkylaniline series. From the data, the orientational order parameter has been estimated using Vuks and Neugebauer local field models. Furthermore, the orientational order parameter has been calculated directly from refractive index data employing the Vuks scaling factor method, Neugebauer f(B) parameter, effective geometry parameter and a method proposed by Kuczyński et al. It is observed that order parameter values estimated from different methods agree well near the nematic-isotropic transition and diverge as the nematic phase attains equilibrium. The temperature gradient of refractive indices and the nematic crossover temperatures have also been estimated for these compounds. The results obtained are compared and discussed.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2014.971325