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Density functional theory study of the nematic-isotropic transition in an hybrid cel

Opened Access Density functional theory study of the nematic-isotropic transition in an hybrid cel


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Autor: Rodríguez Ponce, Inmaculada
Romero Enrique, José Manuel
Rull, Luis F.
Departamento: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Fecha: 2005
Publicado en: Journal of Chemical Physics,122 (1), 014903
Tipo de documento: Artículo
Resumen: We have employed the density functional theory formalism to investigate the nematic–isotropic capillary transitions of a nematogen confined by walls that favor antagonist orientations to the liquid crystal molecules ~hybrid cell!. We analyze the behavior of the capillary transition as a function of the fluid–substrate interactions and the pore width. In addition to the usual capillary transition between isotropiclike to nematiclike states, we find that this transition can be suppressed when one substrate is wet by the isotropic phase and the other by the nematic phase. Under this condition the system presents interfacelike states which allow us to continuously transform the nematiclike phase to the isotropiclike phase without undergoing a sharp phase transition. Two different mechanisms for the disappearance of the capillary transition are identified. When the director of the nematiclike state is homogeneously planar-anchored with respect to the substrates, the capillary tran...
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