Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1776
Título: Nematic wetting and filling of crenellated surfaces
Autor: Silvestre, N. M.
Eskandari, Z.
Patricio, P.
Romero-Enrique, J. M.
Telo da Gama, M. M.
Palavras-chave: Liquid-Crystal Alignment
Phase-Transition
Substrate
Adsorption
Geometry
Layer
Data: 9-Jul-2012
Editora: Amer Physical Soc
Citação: Silvestre N M, Eskandari Z, Patricio P, Romero-Enrique J M, Telo da Gama M M. Nematic wetting and filling of crenellated surfaces.Physical Review E. 2012: 86 (1).
Relatório da Série N.º: ;011703
Resumo: We investigate nematic wetting and filling transitions of crenellated surfaces (rectangular gratings) by numerical minimization of the Landau-de Gennes free energy as a function of the anchoring strength, for a wide range of the surface geometrical parameters: depth, width, and separation of the crenels. We have found a rich phase behavior that depends in detail on the combination of the surface parameters. By comparison to simple fluids, which undergo a continuous filling or unbending transition, where the surface changes from a dry to a filled state, followed by a wetting or unbinding transition, where the thickness of the adsorbed fluid becomes macroscopic and the interface unbinds from the surface, nematics at crenellated surfaces reveal an intriguingly rich behavior: in shallow crenels only wetting is observed, while in deep crenels, only filling transitions occur; for intermediate surface geometrical parameters, a new class of filled states is found, characterized by bent isotropic-nematic interfaces, which persist for surfaces structured on large scales, compared to the nematic correlation length. The global phase diagram displays two wet and four filled states, all separated by first-order transitions. For crenels in the intermediate regime re-entrant filling transitions driven by the anchoring strength are observed.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1776
ISSN: 1539-3755
Aparece nas colecções:ISEL - Física - Artigos

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