High pressure studies on 4'-n-alkyl-4-cyanobiphenyls

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3022

Title:	High pressure studies on 4'-n-alkyl-4-cyanobiphenyls
Authors:	Shashidhar, R. Venkatesh, G.
Issue Date:	Apr-1979
Publisher:	EDP Sciences
Citation:	Journal de Physique, 1979, Vol.40, pC3-396-400
Abstract:	The effect of pressure on the phase transitions in the pentyl to octyl homologues of 4'-n-alkyl-4-cyanobiphenyls has been studied. The slope dT/dP for the nematic-isotropic transition shows an alternation with the number of carbon atoms in the alkyl chain, while that for the solid- nematic (or smectic) transition does not show such a behaviour. The smectic A-nematic transition in 4'-n-octyl-4-cyanobiphenyl. which is first order at atmospheric pressure. becomes second order at high pressures the tricritical point occurring at 2.68 +/- 0.08 kbar. 92.5 +/- 1.5 degree C. The ratio of the smectic A-nematic transition temperature to the nematic-isotropic transition temperature at the tricritical point is 0.90, in reasonable agreement with the prediction of the mean field theory.
Description:	Restricted Access. Proceedings of the 7th international liquid crystal conference held in 1978 at Bordeaux, 1979
URI:	http://hdl.handle.net/2289/3022
ISSN:	1155-4304
Copyright:	1979 EDP Sciences
Appears in Collections:	Research Papers (SCM)

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