Random anisotropy nematic model: Connection with experimental systems |
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Authors: | Email author" target="_blank">S?KraljEmail author V?Popa-Nita |
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Institution: | (1) Laboratory of Physics of Complex Systems, Faculty of Education, University of Maribor, Koroka 160, 2000 Maribor, Slovenia;(2) Solid State Group, Joef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;(3) Faculty of Physics, University of Bucharest, P.O. Box MG-11, 76900 Bucharest, Romania |
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Abstract: | We study theoretically the phase behavior of the continuum Random Anisotropy Nematic model. A domain-type pattern is assumed to appear in a distorted nematic liquid crystal (LC) phase. We map the model parameters to physical quantities characterizing LCs confined to Controlled-Pore Glasses and LC-aerosil dispersions. The domain size dependence on the disorder strength is obtained in accordance with the Imry-Ma prediction. The model estimates for temperature shifts of the paranematic-nematic phase transition and for the critical point, where this transition ceases to exist, are compared to the available experimental results.Received: 28 March 2004, Published online: 29 June 2004PACS:
61.30.-v Liquid crystals - 61.30.Dk Continuum models and theories of liquid crystal structure - 61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order - 61.30.Hn Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions |
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