Adsorption processes in layer-by-layer films of poly(o-methoxyaniline): the role of aggregation

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dc.contributor.authorDe Souza, N. C.
dc.contributor.authorSilva, JR
dc.contributor.authorRodrigues, C. A.
dc.contributor.authorCosta, L. D.
dc.contributor.authorGiacometti, J. A.
dc.contributor.authorOliveira, O. N.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:09Z
dc.date.available2014-05-20T15:28:09Z
dc.date.issued2003-03-20
dc.description.abstractIn this work we investigate the effect from the solution concentration on aggregation in layer-by-layer (LBL) films of poly(omethoxyaniline) (POMA) alternated with poly(vinyl sulfonic acid). Films are adsorbed on hydrophilized glass substrates and characterized with UV-Vis spectroscopy and atomic force microscopy. The formation of aggregates is favored in more concentrated solutions, leading to an increase in the diameter of the domains. This is caused by stronger polymer-polymer interactions under high concentrations. The size of POMA aggregates in solution is estimated to be larger than in LBL films, which is surprising because one should expect aggregates from solution to coalesce into larger aggregates in the deposited films. This unexpected result may be explained by a swelling effect of aggregates in the aqueous POMA solutions, consistent with other reports in the literature which consider the aggregates in solution to be made up of smaller aggregates. Upon adsorption on a solid substrate to form the LBL film, a molecular reorganization probably takes place, resulting in smaller aggregates. It is also found that the size distribution of the POMA domains in the LBL films is determined by the concentration of the solution. (C) 2002 Elsevier B.V. B.V. All rights reserved.en
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent232-236
dc.identifierhttp://dx.doi.org/10.1016/S0040-6090(02)01275-0
dc.identifier.citationThin Solid Films. Lausanne: Elsevier B.V. Sa, v. 428, n. 1-2, p. 232-236, 2003.
dc.identifier.doi10.1016/S0040-6090(02)01275-0
dc.identifier.issn0040-6090
dc.identifier.urihttp://hdl.handle.net/11449/38026
dc.identifier.wosWOS:000182500500047
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofThin Solid Films
dc.relation.ispartofjcr1.939
dc.relation.ispartofsjr0,617
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectpoly (o-methoxyaniline)pt
dc.subjectatomic force microscopypt
dc.subjectpoly(vinyl sulfonic acid)pt
dc.titleAdsorption processes in layer-by-layer films of poly(o-methoxyaniline): the role of aggregationen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4663463575469428[3]
unesp.author.orcid0000-0003-2372-5509[5]
unesp.author.orcid0000-0001-8554-1663[1]
unesp.author.orcid0000-0002-5399-5860[6]
unesp.author.orcid0000-0002-4837-463X[3]

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