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Title: Formation of disclinations line near a free nematic interface
Author: Ignés i Mullol, Jordi
Baudry, Jean
Lejcek, Lubor
Oswald, Patrick
Keywords: Estructura cristal·lina (Sòlids)
Structure of solids and liquids
Issue Date: 1999
Publisher: The American Physical Society
Abstract: We have studied the nucleation and the physical properties of a -1/2 wedge disclination line near the free surface of a confined nematic liquid crystal. The position of the disclination line has been related to the material parameters (elastic constants, anchoring energy, and favored anchoring angle of the molecules at the free surface). The use of a planar model for the structure of the director field (whose predictions have been contrasted to those of a fully three-dimensional model) has allowed us to relate the experimentally observed position of the disclination line to the relevant properties of the liquid crystals. In particular, we have been able to observe the collapse of the disclination line due to a temperature-induced anchoring-angle transition, which has allowed us to rule out the presence of a real disclination line near the nematic/isotropic front in directional growth experiments.
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It is part of: Physical Review e, 1999, vol. 59, p. 568-577
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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