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Refractive Indices, Densities, Polarizabilities and Molecular Order in Cholesteric Liquid Crystals

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Tue, 2014-02-25 14:23 — Dr. Muneer Mustafa Mahd Abdoh
Journal Title, Volume, Page: 
Molecular Crystals and Liquid Crystals Volume 80, Issue 1
Year of Publication: 
1982
Link: 
http://www.tandfonline.com/doi/abs/10.1080/00268948208071030
Authors: 
M. M. M. Abdoh
Department of Physics , University of Mysore , Mysore , 570 006 , India
Current Affiliation: 
Department of Physics, Faculty of Science, An-Najah National University, Palestine
[email protected]
N. C. Shivaprakasha
Srinivasaa
Department of Physics , University of Mysore , Mysore , 570 006 , India
J. Shashidhara Prasada
Department of Physics , University of Mysore , Mysore , 570 006 , India
Preferred Abstract (Original): 

The temperature variation of refractive indices (n o,ne), birefringence (Δn), density (ρ) and order parameter (S) of two cholesteric liquid crystals—cholesteryl benzoate and laurate are reported in the smectic, cholesteric and isotropic phases. The order parameters have been evaluated using Aver'yanov's relations. The S values determined are good agreement with NMR data.

The mean polarizabilities (α) of a few cholesteric liquid crystals have been evaluated using (i) the modified method of Lippincott-δ-function potential model and (ii) the additivity rule of bond polarizabilities. There is good agreement between the values of α calculated by these methods and experimental values, thereby suggesting the general applicability of Lippincott-δ-function potential model to liquid crystals.