Orientational order and tricritical behavior in the trans-p-n-alkoxy-alpha-methyl-p[prime]-cyanophenyl cinnamate (n-OMCPC) series of liquid crystals

Fernandes, J.R.; Venugopalan, S.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1234

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DC Field	Value	Language
dc.contributor.author	Fernandes, J.R.	-
dc.contributor.author	Venugopalan, S.	-
dc.date.accessioned	2006-05-15T10:27:36Z	-
dc.date.available	2006-05-15T10:27:36Z	-
dc.date.issued	1979-01-01	-
dc.identifier.citation	Journal of Chemical Physics, 1979, Vol.70, p519-524	en
dc.identifier.issn	0021-9606	-
dc.identifier.uri	http://hdl.handle.net/2289/1234	-
dc.description.abstract	The temperature dependence of the orientational order parameter S has been evaluated from their infrared spectra for six homologues of the n-OMCPC (trans-p-n-alkoxy-alpha-methyl-p[prime]-cyanophenyl cinnamate) series of liquid crystals with n = 7–12, where n is the number of carbon atoms in the end alkyl chain. The even–odd effect of the S values in the nematic phase is rather weak for homologues 7–10. In homologues 10–12, the changes of S at the transitions have been correlated with their thermodynamic behavior. The smectic A–nematic (A–N) and nematic–isotropic (N–I) transitions in several binary mixtures of 11 with 8, 10, and 12 have been studied by differential scanning calorimetry. With decreasing average alkyl chain length in the mixtures, the nematic range becomes extended and the enthalpy of the A–N transition is found to decrease. We deduce that the tricritical point in the A–N transition occurs when the reduced temperature TR=TAN/TNI=0.94±0.005. The triple point between A, N, and I phases has also been observed in an 11–12 mixture at the mole percent ratio of ~27:73.	en
dc.format.extent	364580 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	The American Institute of Physics	en
dc.relation.uri	http://link.aip.org/link/?jcp/70/519	en
dc.rights	(1979) by the American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.	en
dc.title	Orientational order and tricritical behavior in the trans-p-n-alkoxy-alpha-methyl-p[prime]-cyanophenyl cinnamate (n-OMCPC) series of liquid crystals	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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