Volume 35, Number 3, July 1996
|Page(s)||189 - 194|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Wetting and interfacial order at nematic free surfaces
Departamento de Física da Faculdade de Ciências,
Centro de Física da
Matéria Condensada, Universidade de Lisboa,
Av. Prof. Gama Pinto 2, 1699 Lisboa
2 Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Apartado 1065, Sevilla 41080, Spain
Accepted: 31 May 1996
We apply a density-functional theory to the free surface of a model liquid crystal, to investigate the orientational order at the nematic free surface of systems exhibiting orientational wetting at the isotropic liquid-vapour interface. It is shown that the theory accounts for the growth of the surface ordered layer which develops at the nematic-vapour interface, as the temperature increases up to the triple point, as was recently reported for 4-cyano-4'-n-alkyl-biphenyls. We have found a correlation between the growth of this layer and the non-monotonic temperature dependence of the interfacial tension below the triple point. The theoretical results are in excellent agreement with the results for 8CB.
PACS: 61.30.Cz – Theory and models of liquid crystals / 68.45.Gd – Wetting / 68.10.Cr – Surface energy (surface tension, interface tension, angle of contact, etc.)
© EDP Sciences, 1996
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