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Orientational transitions in a nematic liquid crystal confined by competing surfaces

Opened Access Orientational transitions in a nematic liquid crystal confined by competing surfaces

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Autor: Rull Fernández, Luis Felipe
Rodríguez Ponce, Inmaculada
Romero Enrique, José Manuel
Departamento: Universidad de Sevilla. Departamento Física Atómica, Molecular y Nuclear
Fecha: 2001
Publicado en: Physical Review E covering statistical, nonlinear, biological, and soft matter physics, 64 (5), 1-18.
Tipo de documento: Artículo
Resumen: The effect of confinement on the orientational structure of a nematic liquid crystal model has been investigated by using a version of density-functional theory. We have focused on the case of a nematic confined by opposing flat surfaces, in slab geometry (slit pore), which favor planar molecular alignment (parallel to the surface) and homeotropic alignment (perpendicular to the surface), respectively. The spatial dependence of the tilt angle of the director with respect to the surface normal has been studied, as well as the tensorial order parameter describing the molecular order around the director. For a pore of given width, we find that, for weak surface fields, the alignment of the nematic director is perpendicular to the surface in a region next to the surface favoring homeotropic alignment, and parallel along the rest of the pore, with a sharp interface separating these regions (S phase). For strong surface fields, the director is distorted uniformly, the tilt angle exhibiting ...
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Cita: Rull Fernández, L.F., Rodríguez Ponce, I. y Romero Enrique, J.M. (2001). Orientational transitions in a nematic liquid crystal confined by competing surfaces. Physical Review E covering statistical, nonlinear, biological, and soft matter physics, 64 (5), 1-18.
Tamaño: 222.4Kb
Formato: PDF

URI: http://hdl.handle.net/11441/64404

DOI: 10.1103/PhysRevE.64.051704

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