Rod-like particles growing in sol-gel processing of 1:1 molar mixtures of 3-glycidoxypropyltrimethoxysilane and tetraethoxysilane

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dc.contributor.authorVollet, Dimas Roberto [UNESP]
dc.contributor.authorBarreiro, Luiz Antonio [UNESP]
dc.contributor.authorAwano, Carlos Miranda [UNESP]
dc.contributor.authorDe Vicente, Fabio Simoes [UNESP]
dc.contributor.authorYoshida, Makoto [UNESP]
dc.contributor.authorDonatti, Dario Antonio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:11:04Z
dc.date.available2018-12-11T17:11:04Z
dc.date.issued2017-01-01
dc.description.abstractThe growth kinetics and the structure of organic/silica hybrids prepared from acid hydrolysis of 1:1 molar mixtures of 3-glycidoxypropyltrimethoxysilane and tetraethoxysilane were studied by small-Angle X-ray scattering (SAXS) at 315, 325 and 335K. The evolution of the SAXS intensity is compatible with the growth of silica-rich domains by aggregation from a fixed number of primary particles. Two distinct growth regimes could be identified by analyzing the relation I(0) ∝ R g D between the intensity extrapolated to zero I(0), the radius of gyration R g of the aggregates and the exponent D, which gives information on the geometry and the mechanism of growth of the aggregates. An initial period was attributed to the growth of rod-like particles with approximately the same radius and variable length. At more advanced degrees of aggregation the process was controlled by the growth of larger aggregates with higher-order dimensionality. A narrow distribution of cylinder lengths given by the Schulz function fitted the experimental SAXS data well during the most part of the initial regime of cylindrical particle growth. These particles were later found as rod-like subunits of the larger aggregates grown at more advanced degrees of aggregation. Some condensation possibilities yielding the formation of structures compatible with those inferred from the present study are discussed.en
dc.description.affiliationFísica UNESP-Universidade Estadual Paulista, 178 Rio Claro
dc.description.affiliationUnespFísica UNESP-Universidade Estadual Paulista, 178 Rio Claro
dc.format.extent489-497
dc.identifierhttp://dx.doi.org/10.1107/S1600576717002357
dc.identifier.citationJournal of Applied Crystallography, v. 50, p. 489-497.
dc.identifier.doi10.1107/S1600576717002357
dc.identifier.issn1600-5767
dc.identifier.issn0021-8898
dc.identifier.lattes8837845109364729
dc.identifier.lattes0097996544293892
dc.identifier.lattes8408216349957378
dc.identifier.orcid0000-0001-7696-3004
dc.identifier.scopus2-s2.0-85017102312
dc.identifier.urihttp://hdl.handle.net/11449/174429
dc.language.isoeng
dc.relation.ispartofJournal of Applied Crystallography
dc.relation.ispartofsjr1,635
dc.relation.ispartofsjr1,635
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subject3-glycidoxypropyltrimethoxysilane
dc.subjectaggregation
dc.subjectrod-like particles
dc.subjectSAXS
dc.subjectsmall-Angle X-ray scattering
dc.subjecttetraethoxysilane
dc.titleRod-like particles growing in sol-gel processing of 1:1 molar mixtures of 3-glycidoxypropyltrimethoxysilane and tetraethoxysilaneen
dc.typeArtigo
unesp.advisor.lattes8837845109364729
unesp.author.lattes0097996544293892
unesp.author.lattes8408216349957378[4]
unesp.author.orcid0000-0001-7696-3004[4]

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