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Title: Elastic and optical properties of some 4'-n-alkyl-4-cyanobiphenyls
Authors: Karat, P.P.
Madhusudana, N.V.
Issue Date: 1976
Publisher: Gordon and Breach Science Publishers.
Citation: Molecular Crystals and Liquid Crystals, 1976, Vol.36, p51-64
Abstract: The bend elastic constants (k33) and order parameters (S) derived from optical measurements in the nematic phase of pentlyl, hexyl, heptyl and octyl cyanobiphenyls (5CB, 6CB, 7CB and 8CB respectively) are reported. The odd-even effect is clearly seen in the K33 values of all four compounds and in the S values of the first three. 5CB, 6CB and 7CB show only the nematic mesophase but their elastic constants indicate the existence of smectic-like short range order. For example, even the lowest homologue, 5CB, does not obey the law k33 infin S2 given by the mean field throry. 7CB, has about the same order parameter as 5CB but a much higher elastic constant. 8CB, which shows a smectic A phase as well, exhibits a lower k33 than 7CB near the nematic-isotropic transition point but a pronounced pretransitional increase near the A-N transition.
Description: Restricted Access.
ISSN: 1058-725X
Alternative Location:
Copyright: 1976 OPA (Overseas Publishers Association) N.V.
Appears in Collections:Research Papers (SCM)

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