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Title: Orientational order in liquid crystals exhibited by some binary mixtures of rod-like and bent-core molecules
Authors: Kundu, Brindaban
Pratibha, R.
Madhusudana, N.V.
Issue Date: 1-Mar-2010
Publisher: Springer
Citation: European Physical Journal E, 2010, Vol.31, p145
Abstract: We report measurements of the temperature variations of the optical birefringence in the nematic (N) and partial bilayer SmA (SmAd) phases in 4-n-octyloxy 4′ -cyanobiphenyl made of rod-like (R) molecules and five mixtures of this compound with 1,3-phenylene bis[4-(3-methylbenzoyloxy)] 4′ -n- dodecylbiphenyl 4′ -carboxylate, made of bent-core (BC) molecules. The birefringence decreases with the concentration x of the BC molecules but the macroscopic order parameter initially decreases upto 11mol% of BC molecules and subsequently increases with x . This is attributed to the possible formation of polar clusters of BC molecules. Orientation of BC molecules changes between the N and SmAd phases and the birefringence data in the two phases imply that the kink angle of the BC molecules is ∼ 90° rather than ∼ 110° as obtained from calculations which minimize the energy of the molecule. IR spectroscopic measurements on the mixture with 11mol% of BC molecules have been used to estimate the molecular order parameter S of the R molecules, and to provide additional support for a relatively small kink angle of BC molecules.
Description: Restricted Access.
ISSN: 1292-895X (Online)
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Copyright: 2010 EDP Sciences /Società Italiana di Fisica/Springer
Appears in Collections:Research Papers (SCM)

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