Influence of ionic interactions on the photoinduced Birefringence of poly[1-[4-(3-carboxy-4 hydroxyphenylazo) benzene sulfonamido]-1 2-ethanediyl, sodium salt] films

Página do item simplificado
dc.contributor.authorFerreira, Quirina
dc.contributor.authorGomes, Paulo J.
dc.contributor.authorRaposo, Maria
dc.contributor.authorGiacometti, J. A.
dc.contributor.authorOliveira, Osvaldo N.
dc.contributor.authorRibeiro, Paulo A.
dc.contributor.institutionUniv Nova Lisboa
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:24:42Z
dc.date.available2014-05-20T15:24:42Z
dc.date.issued2007-08-01
dc.description.abstractElectrostatic interactions govern most properties of polyelectrolyte films, as in the photoinduced bire-fringence of azo-containing polymers. In this paper we report a systematic investigation of optical storage characteristics of cast and layer-by-layer (LbL) films of poly[1 -[4-(3-carboxy-4 hydroxypheny-lazo) benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO). Birefringence was photoinduced faster in PAZO cast films prepared at high pHs, with the characteristic writing times decreasing almost linearly with the pH in the range between 4 and 9. This was attributed to an increased free volume for the azochromophores with the enhanced electrostatic repulsion in PAZO charged to a greater extent. In contrast, in LbL films of PAZO alternated with poly(allylamine hydrochloride) (PAH), the electrostatic interactions between the oppositely charged polymers hampered photoisomerization and molecular rearrangement, thus leading to a slower writing kinetics for highly charged PAH or PAZO.en
dc.description.affiliationUniv Nova Lisboa, Fac Ciências & Tecnol, CEFITEC, P-2829516 Caparica, Portugal
dc.description.affiliationUNESP, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUSP, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUnespUNESP, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent2659-2666
dc.identifierhttp://dx.doi.org/10.1166/jnn.2007.621
dc.identifier.citationJournal of Nanoscience and Nanotechnology. Stevenson Ranch: Amer Scientific Publishers, v. 7, n. 8, p. 2659-2666, 2007.
dc.identifier.doi10.1166/jnn.2007.621
dc.identifier.issn1533-4880
dc.identifier.urihttp://hdl.handle.net/11449/35272
dc.identifier.wosWOS:000247884000011
dc.language.isoeng
dc.publisherAmer Scientific Publishers
dc.relation.ispartofJournal of Nanoscience and Nanotechnology
dc.relation.ispartofjcr1.354
dc.relation.ispartofsjr0,326
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectlayer-by-layer filmpt
dc.subjectionic interactionspt
dc.titleInfluence of ionic interactions on the photoinduced Birefringence of poly[1-[4-(3-carboxy-4 hydroxyphenylazo) benzene sulfonamido]-1 2-ethanediyl, sodium salt] filmsen
dc.typeArtigo
dcterms.licensehttp://www.aspbs.com/terms.htm
dcterms.rightsHolderAmer Scientific Publishers

Arquivos

Licença do Pacote
Agora exibindo 1 - 1 de 1
Nenhuma Miniatura disponível
Nome:
license.txt
Tamanho:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descrição:

Coleções

Artigos