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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals Volume 329, 1999 - Issue 1
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SECTION III: SURFACE – INTERFACE, ALIGNMENT – CONFINEMENT

Smectic Layering at the Free Surface of Isotropic Liquid Crystals in the Pre-Smectic Temperature Region Characterized by Ellipsometry

Christ Glorieux Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K.U. Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium; Postdoctoral Researcher for Fonds voor Wetenschappelijk, Onderzoek, Vlaanderen E-mail: [email protected]
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Peter De Schrijver Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K.U. Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium
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Patrick M. Johnson School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, 55455, USA
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Oana Balus Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K.U. Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium
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Constantin Serban Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K.U. Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium
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Cheng Cher Huang School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, 55455, USA
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Jan Thoen Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde, K.U. Leuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium
 show all
Pages 51-58 | Published online: 24 Sep 2006
 
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Abstract

We have recorded the angular dependence of the ellipsometric signal of bulkisotropic dodecylcyanobiphenyl (12CB) as a function of temperature in the pre-smectic temperature region. Using a simple model, the order parameter of the discontinuously growing smectic surface layer has been determined approaching the isotropic-smectic phase transition temperature. Also the pretransitional isotropic region of the isotropic-smectic transition of the liquid crystal compound 2-(4-(1,1-dihydro-2-(2-perfluorobutoxy)perfluoroethcxy) phenyl-5-octyl pyrimidine (H8F(4,2,1)MOPP) has been investigated.

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