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dc.contributor.authorDonatti, D. A.-
dc.contributor.authorIbanez Ruiz, A.-
dc.contributor.authorVicelli, M. R.-
dc.contributor.authorVollet, D. R.-
dc.date.accessioned2014-05-20T15:28:48Z-
dc.date.accessioned2016-10-25T18:03:59Z-
dc.date.available2014-05-20T15:28:48Z-
dc.date.available2016-10-25T18:03:59Z-
dc.date.issued2007-04-01-
dc.identifierhttp://dx.doi.org/10.1002/pssa.200622394-
dc.identifier.citationPhysica Status Solidi A-applications and Materials Science. Weinheim: Wiley-v C H Verlag Gmbh, v. 204, n. 4, p. 1069-1076, 2007.-
dc.identifier.issn0031-8965-
dc.identifier.urihttp://hdl.handle.net/11449/38543-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/38543-
dc.description.abstractAbout similar to 2.1 x 10(-3) Mol SiO2 cm(-3) and similar to 88%-volume liquid-phase silica wet gels were prepared from oxalic-acid-catalyzed tetraethoxysilane (TEOS) sonohydrolysis. Aerogels were obtained by supercritical CO2 extraction. The samples were analyzed by thermogravimetry, small-angle X-ray scattering and nitrogen adsorption. Wet gels can be described as mass fractal structures with fractal dimension D similar to 1.94 and structural characteristic length zeta changing between similar to 3.3 to similar to 3.0 nm in the studied range of the catalyst concentration. A fraction of the porosity is apparently eliminated in the supercritical process. The values of the BET specific surface S-BET, the total pore volume V-p and the mean pore size l(p) of the aerogels were found to change almost randomly around the mean values S-BET = 874 m(2) g(-1), V-p = 0.961 cm(3) g(-1) and l(p) = 4.4 nm with catalyst concentration variation. These values were not substantially different from those from an equivalent HCl-catalyzed aerogel. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.format.extent1069-1076-
dc.language.isoeng-
dc.publisherWiley-Blackwell-
dc.sourceWeb of Science-
dc.titleStructural properties of silica gels prepared from oxalic-acid-catalyzed tetraethoxysilane sonohydrolysisen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, IGCE, Dept Fis, BR-13500970 Rio Claro, SP, Brazil-
dc.identifier.doi10.1002/pssa.200622394-
dc.identifier.wosWOS:000246194800026-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhysica Status Solidi A: Applications and Materials Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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