Manipulation of anchoring strength in an azo-dye side chain polymer by photoisomerization
dc.contributor.author | Thieghi, Leila Thomazelli | |
dc.contributor.author | Barberi, Riccardo | |
dc.contributor.author | Bonvent, Jean Jacques | |
dc.contributor.author | Oliveira, Elizabeth Andreoli de | |
dc.contributor.author | Giacometti, José Alberto [UNESP] | |
dc.contributor.author | Balogh, Débora Terezia | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.contributor.institution | University of Calabria | |
dc.contributor.institution | Universidade de Mogi das Cruzes (UMC) | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-05-20T15:20:36Z | |
dc.date.available | 2014-05-20T15:20:36Z | |
dc.date.issued | 2003-04-01 | |
dc.description.abstract | The 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.affiliation | Universidade de São Paulo (USP), Instituto de Física, São Paulo, SP, Brasil | |
dc.description.affiliation | University of Calabria, Physics Department, Rende, CS, Italy | |
dc.description.affiliation | Universidade de Mogi das Cruzes (UMC), Mogi das Cruzes, SP, Brasil | |
dc.description.affiliation | Universidade Estadual Paulista (UNESP), Faculdade de Ciências e Tecnologia (FCT), Departamento de Física, Química e Biologia, Presidente Prudente, SP, Brasil | |
dc.description.affiliation | Universidade de São Paulo (USP), Instituto de Física de São Carlos, São Carlos, SP, Brasil | |
dc.description.affiliationUnesp | Universidade Estadual Paulista (UNESP), Faculdade de Ciências e Tecnologia (FCT), Departamento de Física, Química e Biologia, Presidente Prudente, SP, Brasil | |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.format.extent | 6 | |
dc.identifier | http://dx.doi.org/10.1103/PhysRevE.67.041701 | |
dc.identifier.citation | Physical Review E. College Pk: Amer Physical Soc, v. 67, n. 4, 6 p., 2003. | |
dc.identifier.doi | 10.1103/PhysRevE.67.041701 | |
dc.identifier.file | WOS000182824400038.pdf | |
dc.identifier.issn | 1539-3755 | |
dc.identifier.uri | http://hdl.handle.net/11449/31876 | |
dc.identifier.wos | WOS:000182824400038 | |
dc.language.iso | eng | |
dc.publisher | American Physical Society | |
dc.relation.ispartof | Physical Review E | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.title | Manipulation of anchoring strength in an azo-dye side chain polymer by photoisomerization | en |
dc.type | Artigo | |
dcterms.license | http://publish.aps.org/authors/transfer-of-copyright-agreement | |
dcterms.rightsHolder | American Physical Society | |
unesp.author.orcid | 0000-0003-2372-5509[5] | |
unesp.author.orcid | 0000-0002-9196-3982[6] | |
unesp.author.orcid | 0000-0001-9713-1696[2] | |
unesp.author.orcid | 0000-0002-9038-9915[3] | |
unesp.campus | Universidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudente | pt |
unesp.department | Física, Química e Biologia - FCT | pt |
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