Structural study of composites of aerosil fumed silica and tetraethoxysilane-derived sonogels

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dc.contributor.authorDonatti, D. A.
dc.contributor.authorRuiz, A. I.
dc.contributor.authorVollet, D. R.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:30:08Z
dc.date.available2014-05-20T15:30:08Z
dc.date.issued2005-05-15
dc.description.abstractComposites of aerosil fumed silica and tetraethoxysilane-derived sonogel were prepared by changing the aerosil content between 0 and 30wt% with respect to the silica content in the original tetraethoxysilane (TEOS). The structural characteristics were studied by density and Vickers microhardness measurements and analyzed by means of small-angle X-ray scattering (SAXS). The structure of the composite aerosil/TEOS-derived sonogel can be described as inclusions of the aerosil particles embedded in the matrix of the TEOS-derived sonogel, forming an aerosil/matrix interfacial surface inside the composite. The weakening of the bonding of aerosil/matrix interface, as suggested by the reported decrease in microhardness, increases the fracture toughness of the composite. The additive effect of the aerosil particles on the structure of the sonogel accounts for the increase of the bulk density and reduction of the specific surface of the composite. Some internal structure associated with the microclusters making up the sonogels is apparent from systematic deviations from Porod's law found in the system with small aerosil contents. (c) 2005 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500 Rio Claro, SP, Brazil
dc.format.extent1226-1231
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2005.03.018
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 351, n. 14-15, p. 1226-1231, 2005.
dc.identifier.doi10.1016/j.jnoncrysol.2005.03.018
dc.identifier.issn0022-3093
dc.identifier.lattes3538107401166553
dc.identifier.lattes5890636096105376
dc.identifier.lattes2661573794233385
dc.identifier.urihttp://hdl.handle.net/11449/39585
dc.identifier.wosWOS:000229523200008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleStructural study of composites of aerosil fumed silica and tetraethoxysilane-derived sonogelsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes3538107401166553
unesp.author.lattes5890636096105376
unesp.author.lattes2661573794233385
unesp.author.orcid0000-0001-8154-9692[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE