The role of permanent dipoles in nematic order

Madhusudana, N.V.; Chandrasekhar, S.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/910

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DC Field	Value	Language
dc.contributor.author	Madhusudana, N.V.	-
dc.contributor.author	Chandrasekhar, S.	-
dc.date.accessioned	2005-12-27T10:57:53Z	-
dc.date.available	2005-12-27T10:57:53Z	-
dc.date.issued	1975	-
dc.identifier.citation	Pramana Supplement, 1975, Vol. 1, p57-68.	en
dc.identifier.issn	0304-4289	-
dc.identifier.uri	http://hdl.handle.net/2289/910	-
dc.description	Proceedings of the international liquid crystal conference, Bangalore, 1973.	en
dc.description.abstract	We propose a new model for the statistical description of short range order in nematic liquid crystals of positive dielectric anisotropy. We consider the molecules to be cylindrically symmet- ric and assume the pair potential to be of the form AP1,( cos Θij) - BP2( cos Θij) which favours an antiparallel arrangement of the perma- 11 nent dipoles. From physical considerations, antiferroelectric long range ordering is not expected to be present in nematics. Applying the Krieger-James approximation, solutions are obtained with an apolar or P2( cos Θ ) type of long range order, but allowing for antiferro- electric short range order. Two important consequences of the theory arc ( i ) the mean dielectric constant should increase slightly on passing from the nematic to the isotropic phase, (ii) the magnetic and electr~c birefringence in the isotropic phase should both vary approximately as ( T-T* )-1, where T* is the hypothetical second order transition point, except when the dipolar interactions are very strong, in which case the electric birefringence should exhibit a slower variation at tempe- ratures well above T. Choosing values of A/B*, illustrative calculations are given of the long range and short range order parameters, dielectric properties, electric and magnetic birefringence. The results are in general agreement with the experimental data for such compounds.	en
dc.format.extent	440432 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Indian Academy of Sciences, Bangalore, India.	en
dc.rights	Indian Academy of Sciences, Bangalore, India.	en
dc.title	The role of permanent dipoles in nematic order	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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