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

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dc.contributor.authorThieghi, Leila Thomazelli
dc.contributor.authorBarberi, Riccardo
dc.contributor.authorBonvent, Jean Jacques
dc.contributor.authorOliveira, Elizabeth Andreoli de
dc.contributor.authorGiacometti, José Alberto [UNESP]
dc.contributor.authorBalogh, Débora Terezia
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversity of Calabria
dc.contributor.institutionUniversidade de Mogi das Cruzes (UMC)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:20:36Z
dc.date.available2014-05-20T15:20:36Z
dc.date.issued2003-04-01
dc.description.abstractThe 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.en
dc.description.affiliationUniversidade de São Paulo (USP), Instituto de Física, São Paulo, SP, Brasil
dc.description.affiliationUniversity of Calabria, Physics Department, Rende, CS, Italy
dc.description.affiliationUniversidade de Mogi das Cruzes (UMC), Mogi das Cruzes, SP, Brasil
dc.description.affiliationUniversidade Estadual Paulista (UNESP), Faculdade de Ciências e Tecnologia (FCT), Departamento de Física, Química e Biologia, Presidente Prudente, SP, Brasil
dc.description.affiliationUniversidade de São Paulo (USP), Instituto de Física de São Carlos, São Carlos, SP, Brasil
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP), Faculdade de Ciências e Tecnologia (FCT), Departamento de Física, Química e Biologia, Presidente Prudente, SP, Brasil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent6
dc.identifierhttp://dx.doi.org/10.1103/PhysRevE.67.041701
dc.identifier.citationPhysical Review E. College Pk: Amer Physical Soc, v. 67, n. 4, 6 p., 2003.
dc.identifier.doi10.1103/PhysRevE.67.041701
dc.identifier.fileWOS000182824400038.pdf
dc.identifier.issn1539-3755
dc.identifier.urihttp://hdl.handle.net/11449/31876
dc.identifier.wosWOS:000182824400038
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review E
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleManipulation of anchoring strength in an azo-dye side chain polymer by photoisomerizationen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmerican Physical Society
unesp.author.orcid0000-0003-2372-5509[5]
unesp.author.orcid0000-0002-9196-3982[6]
unesp.author.orcid0000-0001-9713-1696[2]
unesp.author.orcid0000-0002-9038-9915[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept

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