Structure and aggregation kinetics of vinyltriethoxysilane-derived organic/silica hybrids

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dc.contributor.authorVollet, Dimas R. [UNESP]
dc.contributor.authorDonatti, Dario A. [UNESP]
dc.contributor.authorAwano, Carlos M. [UNESP]
dc.contributor.authorChiappim, William [UNESP]
dc.contributor.authorVicelli, Marcio R. [UNESP]
dc.contributor.authorRuiz, Alberto Ibanez [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:50:53Z
dc.date.accessioned2014-05-20T14:16:37Z
dc.date.available2013-09-30T18:50:53Z
dc.date.available2014-05-20T14:16:37Z
dc.date.issued2010-10-01
dc.description.abstractThe aggregation kinetics of solutions of vinyltriethoxysilane-derived organic/silica hybrid species were studied by small-angle X-ray scattering (SAXS) in a strongly basic medium. The SAXS intensity was analysed by a modified Sharp-Bloomfield (SB) global function and its evolution was found to be compatible with the growth, coiling and branching of the polymeric macromolecules in solution. A form factor valid for randomly and nonrandomly branched polycondensates and for polydisperse coils of linear chains was used in the modified SB model, instead of the Debye function valid for monodisperse coils of linear chains. The aggregation kinetics are accelerated with increasing base concentration in the studied range, but all the kinetics curves can be matched to a unique curve using an appropriate time scaling factor. The aggregation kinetics suggest that physical forces (hydrothermal forces) associated with phase coarsening could be active in the aggregation process, together with diffusion mechanisms.en
dc.description.affiliationUNESP Univ Estadual Paulista, Dept Fis, IGCE, BR-13500970 Rio Claro, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Dept Fis, IGCE, BR-13500970 Rio Claro, SP, Brazil
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent1005-1011
dc.identifierhttp://dx.doi.org/10.1107/S0021889810030062
dc.identifier.citationJournal of Applied Crystallography. Malden: Wiley-blackwell, v. 43, p. 1005-1011, 2010.
dc.identifier.doi10.1107/S0021889810030062
dc.identifier.issn0021-8898
dc.identifier.lattes3538107401166553
dc.identifier.lattes5890636096105376
dc.identifier.urihttp://hdl.handle.net/11449/24999
dc.identifier.wosWOS:000281996600008
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofJournal of Applied Crystallography
dc.relation.ispartofsjr1,635
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectaggregation kineticsen
dc.subjectorganicen
dc.subjectsilica hybridsen
dc.subjectmacromoleculesen
dc.subjectsmall-angle X-ray scatteringen
dc.titleStructure and aggregation kinetics of vinyltriethoxysilane-derived organic/silica hybridsen
dc.typeArtigo
dcterms.licensehttp://journals.iucr.org/services/copyrightpolicy.html
dcterms.rightsHolderWiley-blackwell
unesp.author.lattes3538107401166553
unesp.author.lattes5890636096105376
unesp.author.orcid0000-0001-8154-9692[1]
unesp.author.orcid0000-0003-2615-2216[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE