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Surface diffusion of matter in discotic liquid crystal threads

Affiliation:	1. Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;2. Department of Chemistry, College of Science, Federal University of Petroleum Resources Effurun, Nigeria;3. Department of Chemical and Physical Sciences, Faculty of Natural Sciences, Walter Sisulu University, Mthatha 5099, South Africa;4. Material Science Innovation and Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Science, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho, South Africa;5. Department of Chemistry, Faculty of Natural and Agricultural, Science, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa

Abstract:	The first measurements of the surface diffusion coefficients in columnar discotic liquid crystal thread and film by an optical absorption technique are presented. A comparison of the results with the diffusion in the bulk specimen helps to introduce the number of diffusion sites in the surface and in the bulk. We propose then a structure of point defects in the mesophase. An estimation of jump frequency is deduced. The dependence of the surface diffusion versus the temperature seems in agreement with the Arrhenius law.

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