Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/3943
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. |
URI: | http://hdl.handle.net/2289/3943 |
ISSN: | 1292-895X (Online) 1292-8941 |
Alternative Location: | http://dx.doi.org/10.1140/epje/i2010-10556-8 |
Copyright: | 2010 EDP Sciences /Società Italiana di Fisica/Springer |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2010_EPJE_31_145.pdf Restricted Access | Restricted Access | 598.61 kB | Adobe PDF | View/Open Request a copy |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.