A study of the hydrolysis pathway in oxalic acid catalyzed reacting TMOS-water mixtures under ultrasound stimulation

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dc.contributor.authorDonatti, D. A.
dc.contributor.authorVollet, D. R.
dc.contributor.authorRuiz, A. I.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:37Z
dc.date.available2014-05-20T15:28:37Z
dc.date.issued2000-04-01
dc.description.abstractThe hydrolysis of TMOS in oxalic acid catalyzed reacting TMOS-water mixtures, under ultrasound stimulation, was studied by fitting a simplified dissolution and reaction modeling for samples, the hydrolysis rate of which had been measured in a previous work. The reaction pathway represented in a ternary diagram shows a heterogeneous step for the reaction which gradually progresses until complete homogenization of the system. Besides the water dissolved due to the homogenizing effect of the alcohol, ultrasound maintains a virtual and additional dissolution of water located at the interface between the TMOS and water during the heterogeneous step of the reaction. The mean radius of the heterogeneity represented by water dispersed in TMOS was evaluated as around 150 Angstrom. The oxalic acid concentration accordingly increases the hydrolysis rate constant but its fundamental role on the solubility of water in TMOS could not unequivocally be established.en
dc.description.affiliationUniv Estadual Paulista, Dept Fis, BR-13500970 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Fis, BR-13500970 Rio Claro, SP, Brazil
dc.format.extent5-9
dc.identifierhttp://dx.doi.org/10.1023/A:1008717027627
dc.identifier.citationJournal of Sol-gel Science and Technology. Dordrecht: Kluwer Academic Publ, v. 18, n. 1, p. 5-9, 2000.
dc.identifier.doi10.1023/A:1008717027627
dc.identifier.issn0928-0707
dc.identifier.lattes3538107401166553
dc.identifier.lattes2661573794233385
dc.identifier.lattes5890636096105376
dc.identifier.urihttp://hdl.handle.net/11449/38391
dc.identifier.wosWOS:000086420200001
dc.language.isoeng
dc.publisherKluwer Academic Publ
dc.relation.ispartofJournal of Sol-Gel Science and Technology
dc.relation.ispartofjcr1.745
dc.relation.ispartofsjr0,477
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectTMOSpt
dc.subjecthydrolysispt
dc.subjectultrasoundpt
dc.subjectoxalic acidpt
dc.titleA study of the hydrolysis pathway in oxalic acid catalyzed reacting TMOS-water mixtures under ultrasound stimulationen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
dcterms.rightsHolderKluwer Academic Publ
unesp.author.lattes3538107401166553
unesp.author.lattes2661573794233385
unesp.author.lattes5890636096105376
unesp.author.orcid0000-0001-8154-9692[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE