Dielectric properties of some nematics of positive dielectric anisotropy

Ratna, B.R.; Shashidhar, R.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2612

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DC Field	Value	Language
dc.contributor.author	Ratna, B.R.	-
dc.contributor.author	Shashidhar, R.	-
dc.date.accessioned	2007-06-05T11:13:33Z	-
dc.date.available	2007-06-05T11:13:33Z	-
dc.date.issued	1978	-
dc.identifier.citation	Molecular Crystals and Liquid Crystals, 1978, Vol.45, p103-116	en
dc.identifier.issn	1058-725X	-
dc.identifier.uri	http://hdl.handle.net/2289/2612	-
dc.description	Restricted Access.	en
dc.description.abstract	The static dielectric constants of biphenyl-4-p-n-alkoxybenzoates have been measured as functions of temperature. The dielectric anisotropy (b.deltab.epsi) for the successive homologues (hexyl to undecyl) shows an alternation similar to that exhibited by the nematic-isotropic transition temperature (TNI). The dispersion of b.epsipar in the frequency range of 0.1-15 MHz has been studied for four successive members of biphenyl-4-p-n-alkoxybenzoates (heptyl to decyl derivatives) as well as of trans-p-n-alkoxy-agr-methyl-p'-cyanophenyl cinnamates (eighth to eleventh members). For both series the relaxation frequency (fR) and the frequency of dielectric isotropy (fo) evaluated at a common relative temperature show an alternation similar to TNI. For any given compound the Arrhenius plots for fR and fo give the same value of the activation energy (W). In the case of the biphenyl esters the vaue of W is the same for the seventh and eighth members, but increases for the higher members which exhibit a smectic phase at lower temperatures. On the contrary for cinnamic acid esters W is found to be the same for all homologues irrespective of whether the nematic phase is preceded by a smectic phase or not.	en
dc.format.extent	425322 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Gordon and Breach Science Publishers.	en
dc.relation.uri	http://dx.doi.org/10.1080/15421407808083960	en
dc.rights	1978 OPA (Overseas Publishers Association) N.V.	en
dc.title	Dielectric properties of some nematics of positive dielectric anisotropy	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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