Title

Diffuse Cone Behavior and Microscopic Structure of the de Vries Smectic-A and Sm-C Phases

Publication Title

Proceedings of the SPIE

Publication Date

2011

Document Type

Article

DOI

10.1117/12.893045

Disciplines

Physics

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.

Comments

Copyright 2011, Society of Photo-Optical Instrumentation Engineers.

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