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Proceedings Paper

Diffuse cone behavior and microscopic structure of the de Vries smectic-A and smectic-C phases
Author(s): HyunGuen Yoon; Dena M. Agra-Kooijman; Khurshid Ayub; Robert P. Lemieux; Satyendra Kumar
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Paper Abstract

Direct synchrotron x-ray scattering measurements of the orientational order parameter, S, corresponding to the siloxane and hydrocarbon parts of the molecule, smectic layer spacing, and director tilt angle with respect to the smectic-C (SmC) layer normal in the de Vries smectics-A (SmA) and SmC phases of two organosiloxane mesogens are reported. The results reveal that (i) the SmC (tilt) order parameter exponent β = 0.26 ± 0.01 for 2nd order SmA-SmC transition in excellent agreement with the tricritical behavior, (ii) the siloxane and hydrocarbon parts of the molecules are segregated and oriented parallel to the director with different degree of orientational order, and (iii) thermal evolution of the effective molecular length is different in the two phases contrary to the conventional wisdom.

Paper Details

Date Published: 22 September 2011
PDF: 11 pages
Proc. SPIE 8114, Liquid Crystals XV, 81140O (22 September 2011); doi: 10.1117/12.893045
Show Author Affiliations
HyunGuen Yoon, Kent State Univ. (United States)
Dena M. Agra-Kooijman, Kent State Univ. (United States)
Khurshid Ayub, COMSATS Institute of Information Technology (Pakistan)
Robert P. Lemieux, Queen's Univ. (Canada)
Satyendra Kumar, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 8114:
Liquid Crystals XV
Iam Choon Khoo, Editor(s)

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