Small-angle X-ray scattering and nitrogen adsorption study of the nanoporosity elimination in TEOS sonohydrolysis-derived xerogels

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dc.contributor.authorVollet, A. R.
dc.contributor.authorde Castro, W. C.
dc.contributor.authorDonatti, D. A.
dc.contributor.authorRuiz, A. L.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:20:19Z
dc.date.available2014-05-20T15:20:19Z
dc.date.issued2005-02-01
dc.description.abstractSmall-angle X-ray scattering (SAXS) and nitrogen adsorption techniques were used to study the temperature and time structural evolution of the nanoporosity in silica xerogels prepared from acid- and ultrasound-catalyzed hydrolysis of tetraetboxysilane (TEOS). Silica xerogels present a structure of nanopores of fully random shape, size, and distribution, which can be described by an exponential correlation function gamma(r) = exp (-r/a), where a is the correlation distance, as predicted by the Debye, Anderson, and Brumberger (DAB) model. The mean pore size was evaluated as about 1.25 nm from SAXS and about 1.9 nm from nitrogen adsorption. The nanopore elimination in TEOS sonohydrolysis-derived silica xerogels is readily accelerated at temperatures around 900 degrees C probably by the action of a viscous flow mechanism. The nanopore elimination process takes place in such a way that the pore volume fraction and the specific surface are reduced while the mean pore size remains constant. (c) 2005 WILEY-VCH Verlag GmbH S Co. KGaA, Weinheim.en
dc.description.affiliationUNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil
dc.description.affiliationUnespUNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil
dc.format.extent411-418
dc.identifierhttp://dx.doi.org/10.1002/pssa.200406929
dc.identifier.citationPhysica Status Solidi A-applied Research. Weinheim: Wiley-v C H Verlag Gmbh, v. 202, n. 3, p. 411-418, 2005.
dc.identifier.doi10.1002/pssa.200406929
dc.identifier.issn0031-8965
dc.identifier.lattes3538107401166553
dc.identifier.urihttp://hdl.handle.net/11449/31642
dc.identifier.wosWOS:000227725600017
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofPhysica Status Solidi A: Applied Research
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleSmall-angle X-ray scattering and nitrogen adsorption study of the nanoporosity elimination in TEOS sonohydrolysis-derived xerogelsen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
unesp.author.lattes3538107401166553
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE