Manipulation of anchoring strength in an azo-dye side chain polymer by photoisomerization

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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversity of Calabria-
Autor(es): dc.contributorUniversidade de Mogi das Cruzes-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorThieghi, L. T.-
Autor(es): dc.creatorBarberi, R.-
Autor(es): dc.creatorBonvent, J. J.-
Autor(es): dc.creatorOliveira, E. A.-
Autor(es): dc.creatorGiacometti, J. A.-
Autor(es): dc.creatorBalogh, D. T.-
Data de aceite: dc.date.accessioned2025-08-21T18:49:16Z-
Data de disponibilização: dc.date.available2025-08-21T18:49:16Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2003-01-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevE.67.041701-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/231975-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/231975-
Descrição: dc.descriptionThe generation of surface anisotropy by photochemical means has been proposed as an attractive method to align liquid crystals. In this paper, we present an experimental study of the alignment induced on a liquid crystal by a polymer film containing azo-dye groups in the side chain. Optical measurements were performed in nematic liquid crystal cells to determine the azimuthal and zenithal anchoring strengths as a function of the irradiation energy and chromophores concentration. It was observed that the director tends to align perpendicular to the polarization direction of the incident light and the orientation process consists essentially of a rotation of the director in the plane parallel to the boundary surfaces. However, the concentration of azo-dye groups in the polymer film must exceed a minimum value to get a macroscopical effect on the liquid crystal alignment. It is shown that the azimuthal anchoring strength can be varied two orders of magnitude by controlling the irradiation energy and azo-dye concentration. © 2003 The American Physical Society.-
Descrição: dc.descriptionInstituto de Física Universidade de São Paulo, P.O. Box 66318, São Paulo, SP, 05315-970-
Descrição: dc.descriptionINFM Research Unit Physics Department University of Calabria, via Pietro Bucci, Rende (CS), 87036-
Descrição: dc.descriptionUniversidade de Mogi das Cruzes, Avenida Dr. Cândido Xavier de Almeida Souza 200, Mogi das Cruzes, SP, CEP 08780-911-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia Universidade Estadual Paulista, Presidente Prudente, SP, 19060-900-
Descrição: dc.descriptionInstituto de Física de São Carlos Universidade de São Paulo, P.O. Box 369, São Carlos, SP, 13560-970-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia Universidade Estadual Paulista, Presidente Prudente, SP, 19060-900-
Formato: dc.format6-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics-
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Título: dc.titleManipulation of anchoring strength in an azo-dye side chain polymer by photoisomerization-
Tipo de arquivo: dc.typelivro digital-
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