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2H NMR measurements of the molecular orientational ordering in a reentrant liquid-crystalline mixture

✍ Scribed by N.A.P. Vaz; Z. Yaniv; J.W. Doane

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 539 KB
Volume: 98
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(83)80222-x

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✦ Synopsis

Dcuterium NMR measurements of the moIecuiar orientational ordering (nematic order) are reported for a reentrant I&txy mixture of some alkanycyanobiphenyl (nOCB) to which small amounts of perdeuterated p-xylene have been added. The results indicate that the degree of orientational order is enhanced at the smectic A to reentrant nematic phase transition. This effect is shown to be in agreement with the predictions of a Landau-type theory of the reentrant phase transition whereby rhis phase transition is explained as the result of a couplin_e between the smectic and the nematic order parameters.

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