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Abstract
The effective geometry parameter, αg = n o /n e, is used to evaluate the orientational order parameter, S, in the case of N-(p-n-butyloxybenzylidene)-p-n-alkoxy anilines, 4O.Om and N-(p-n-heptyloxybenzylidene)-p-n-alkoxy anilines, 7O.Om compounds with m = 3–7 and 9 in the former case and m = 3, 5–7 and 9 in the later materials. The results obtained are compared with those calculated using the standard techniques of molecular polarisability and birefringence. The effective geometry parameter's influence on the deflection of light by the liquid crystal compounds is also studied. The variation of temperature gradient of the ordinary refractive index, dn o /dT, and extraordinary refractive index, dn e /dT, of the liquid crystals is also studied.
Acknowledgements
The author Mrs. M. Saraswathi and Dr. P.P. Datta Prasad thank the principal and the management of The Hindu College, Machilipatnam, India for providing the research facilities. D. Madhavi Latha and Dr. V.G.K.M. Pisipati express their thanks to The Head, ECE Dept. and the management of K.L. University, Vaddeswaram 522 502, India for providing the facilities. This work is supported by the Department of Science and Technology (Grant No: SR/S2/CMP-0071/2008). D. Madhavi Latha acknowledges the financial support of DST-WOS-A through grant No.SR/WOS-A/PS-05/2010.