Diffuse cone behavior and microscopic structure of the de Vries smectic-A and smectic-C phases

HyunGuen Yoon; Dena M. Agra-Kooijman; Khurshid Ayub; Robert P. Lemieux; Satyendra Kumar

doi:10.1117/12.893045

22 September 2011 Diffuse cone behavior and microscopic structure of the de Vries smectic-A and smectic-C phases

HyunGuen Yoon, Dena M. Agra-Kooijman, Khurshid Ayub, Robert P. Lemieux, Satyendra Kumar

Proceedings Volume 8114, Liquid Crystals XV; 81140O (2011) https://doi.org/10.1117/12.893045
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

HyunGuen Yoon, Dena M. Agra-Kooijman, Khurshid Ayub, Robert P. Lemieux, and Satyendra Kumar "Diffuse cone behavior and microscopic structure of the de Vries smectic-A and smectic-C phases", Proc. SPIE 8114, Liquid Crystals XV, 81140O (22 September 2011); https://doi.org/10.1117/12.893045

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