Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3590
Título: Colloidal dipolar interactions in 2D smectic-C films
Autor: Patrício, Pedro
Tasinkevych, M.
Gama, M. M. T. da
Palavras-chave: Nematic liquid-crystal
Saturn-ring defects
Topological defects
Data: Fev-2002
Editora: Springer-Verlag
Citação: PATRICIO, P.; TASINKEVYCH, M.; GAMA, M. M. T. da - Colloidal dipolar interactions in 2D smectic-C films. European Physical Journal E. ISSN 1292-8941. Vol. 7, nr. 2 (2002), p. 117-122.
Resumo: We use a two-dimensional (2D) elastic free energy to calculate the effective interaction between two circular disks immersed in smectic-C films. For strong homeotropic anchoring, the distortion of the director field caused by the disks generates topological defects that induce an effective interaction between the disks. We use finite elements, with adaptive meshing, to minimize the 2D elastic free energy. The method is shown to be accurate and efficient for inhomogeneities on the length scales set by the disks and the defects, that differ by up to 3 orders of magnitude. We compute the effective interaction between two disk-defect pairs in a simple (linear) configuration. For large disk separations, D, the elastic free energy scales as similar to D-2, confirming the dipolar character of the long-range effective interaction. For small D the energy exhibits a pronounced minimum. The lowest energy corresponds to a symmetrical configuration of the disk-defect pairs, with the inner defect at the mid-point between the disks. The disks are separated by a distance that, is twice the distance of the outer defect from the nearest disk. The latter is identical to the equilibrium distance of a defect nucleated by an isolated disk.
Peer review: yes
URI: http://hdl.handle.net/10400.21/3590
ISSN: 1292-8941
Versão do Editor: http://epje.epj.org/articles/epje/abs/2002/02/101890117/101890117.html
Aparece nas colecções:ISEL - Física - Artigos

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