A kinetic study of the effect of ultrasound power on the sonohydrolysis of tetraethyl orthosilicate

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dc.contributor.authorCortes, Andresa D. S.
dc.contributor.authorDonatti, Dario A.
dc.contributor.authorRuiz, A. Ibanez
dc.contributor.authorVollet, Dimas R.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:49Z
dc.date.available2014-05-20T15:28:49Z
dc.date.issued2007-09-01
dc.description.abstractA kinetic study of the ultrasound-stimulated and acid-catalyzed sonohydrolysis of tetraethyl orthosilicate (TEOS) in solventless TEOS-water heterogeneous mixtures was carried out by means of a calorimetric method as a function of the ultrasound power. The hydrolysis reaction starts in acidulated heterogeneous water-TEOS mixtures after an induction period under ultrasonic stimulation. The ultrasound power seems to play a role on the dynamical coupling of the system originating a continuum upward shifting of the base line during the induction period of sonication. The rate in which the base line is upward shifted diminishes with the power. The best coupling between the ultrasound and the reactant heterogeneous mixtures for this experimental setup was found to occur at 50 W, for which the gelation time was found to be a minimum. The kinetics of the heterogeneous TEOS sonohydrolysis was studied on the basis of a dissolution and reaction modeling. The heterogeneous reaction pathway as deduced from the kinetic study was drawn in a ternary diagram as a function of the ultrasound power. (C) 2006 Elsevier B.V. All rights reserved.en
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.format.extent711-716
dc.identifierhttp://dx.doi.org/10.1016/j.ultsonch.2006.12.002
dc.identifier.citationUltrasonics Sonochemistry. Amsterdam: Elsevier B.V., v. 14, n. 6, p. 711-716, 2007.
dc.identifier.doi10.1016/j.ultsonch.2006.12.002
dc.identifier.issn1350-4177
dc.identifier.lattes3538107401166553
dc.identifier.lattes5890636096105376
dc.identifier.urihttp://hdl.handle.net/11449/38559
dc.identifier.wosWOS:000248604100008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofUltrasonics Sonochemistry
dc.relation.ispartofjcr6.012
dc.relation.ispartofsjr1,412
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsol-gelpt
dc.subjectTEOS sonohydrolysispt
dc.subjectsonication powerpt
dc.subjectheterogeneous kineticspt
dc.titleA kinetic study of the effect of ultrasound power on the sonohydrolysis of tetraethyl orthosilicateen
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.orcid0000-0001-8154-9692[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE