Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3591
Título: Colloidal interactions in two-dimensional nematics
Autor: Tasinkevych, M.
Silvestre, N. M.
Patrício, Pedro
Gama, M. M. T. da
Palavras-chave: Saturn-Ring Defects
Topological Defects
Data: Nov-2002
Editora: Springer-Verlag
Citação: TASINKEVYCH, M.; SILVESTRE, N.M.; PATRICIO, P.; GAMA, M. M. T. da - Colloidal interactions in two-dimensional nematics. European Physical Journal E. ISSN 1292-8941. Vol. 9, nr. 4 (2002), p. 341-347.
Resumo: The interaction between two disks immersed in a 2D nernatic is investigated i) analytically using the tenser order parameter formalism for the nematic configuration around isolated disks and ii) numerically using finite-element methods with adaptive meshing to minimize the corresponding Landau-de Gennes free energy. For strong homeotropic anchoring, each disk generates a pair of defects with one-half topological charge responsible for the 2D quadrupolar interaction between the disks at large distances. At short distance, the position of the defects may change, leading to unexpected complex interactions with the quadrupolar repulsive interactions becoming attractive. This short-range attraction in all directions is still anisotropic. As the distance between the disks decreases, their preferred relative orientation with respect to the far-field nernatic director changes from oblique to perpendicular.
Peer review: yes
URI: http://hdl.handle.net/10400.21/3591
ISSN: 1292-8941
Versão do Editor: http://arxiv.org/pdf/cond-mat/0210004v1.pdf
Aparece nas colecções:ISEL - Física - Artigos

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