Effects of HCl on the ultrasound catalyzed TEOS hydrolysis as determined by a calorimetric study

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dc.contributor.authorDonatti, D. A. [UNESP]
dc.contributor.authorVollet, D. R. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:18:07Z
dc.date.available2014-05-27T11:18:07Z
dc.date.issued1996-11-01
dc.description.abstractThe acid catalyzed and ultrasound stimulated hydrolysis of solventless tetraethoxysilane-water mixtures was studied at 39°C as a function of HCl added to the mixtures (log[HCl]-1 ranged from 0.8 to 2.0), The reaction was carried out in a specially designed device, in which a steady state heat flow is maintained, while sonication is taking place, if no reaction is expected to occur. The exothermal hydrolysis reaction causes an increasing temperature (ΔTt) as a function of the reaction time, t. The isothermal hydrolysis rate constant, k, has been evaluated from the experimental ΔTt versus t data, after corrections for the increasing temperature effects, by using a method resulting from our theoretical modeling based on a dissolution and reaction mechanism. The hydrolysis rate constant fits closely a k α [H+] law as expected for this kind of hydrogen-ion catalyzed reaction.en
dc.description.affiliationDepartamento de Física Universidade Estadual Paulista Campus de Rio Claro, Cx.P. 178, 13500-970 Rio Claro (SP)
dc.description.affiliationUnespDepartamento de Física Universidade Estadual Paulista Campus de Rio Claro, Cx.P. 178, 13500-970 Rio Claro (SP)
dc.format.extent99-104
dc.identifierhttp://dx.doi.org/10.1016/S0022-3093(96)00508-X
dc.identifier.citationJournal of Non-Crystalline Solids, v. 208, n. 1-2, p. 99-104, 1996.
dc.identifier.doi10.1016/S0022-3093(96)00508-X
dc.identifier.issn0022-3093
dc.identifier.lattes3538107401166553
dc.identifier.lattes2661573794233385
dc.identifier.scopus2-s2.0-0030283616
dc.identifier.urihttp://hdl.handle.net/11449/64870
dc.identifier.wosWOS:A1996WB29400010
dc.language.isoeng
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCalorimetry
dc.subjectCatalysis
dc.subjectComposition effects
dc.subjectDissolution
dc.subjectHeat transfer
dc.subjectHydrochloric acid
dc.subjectMathematical models
dc.subjectMixtures
dc.subjectSilanes
dc.subjectWater
dc.subjectSonication
dc.subjectTetrathoxysilane
dc.subjectHydrolysis
dc.titleEffects of HCl on the ultrasound catalyzed TEOS hydrolysis as determined by a calorimetric studyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.author.lattes3538107401166553
unesp.author.lattes2661573794233385
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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