Phase separation in pyrex glass by hydrothermal treatment: evidence from micro-Raman spectroscopy

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dc.contributor.authorSigoli, F. A.
dc.contributor.authorKawano, Y.
dc.contributor.authorDavolos, Marian Rosaly [UNESP]
dc.contributor.authorJafelicci, M.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:26:50Z
dc.date.available2014-05-20T15:26:50Z
dc.date.issued2001-05-01
dc.description.abstractIn this work, we investigated the formation of porous silica matrix obtained by hydrothermal treatment under saturated steam condition from Pyrex (R) glass. This investigation was carried out by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray powder diffractometry (XRD) and Raman microscopy. We observed the presence of connected and homogeneously distributed pores in a non-crystalline silica phase and a detectable interface between silica and remnant glass phases resulting in a framework similar to asymmetric membranes. The results indicate that the process of phase separation takes place at lower temperature than that of glass-transition on the surface of the glass phase. Essential reaction between water and silica at supercritical condition together with the formation and leaching of soluble phase contribute to obtain porous silica matrix, (C) 2001 Elsevier B.V. B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Quim, BR-05599970 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.format.extent49-54
dc.identifierhttp://dx.doi.org/10.1016/S0022-3093(01)00378-7
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 284, n. 1-3, p. 49-54, 2001.
dc.identifier.doi10.1016/S0022-3093(01)00378-7
dc.identifier.issn0022-3093
dc.identifier.lattes4284809342546287
dc.identifier.urihttp://hdl.handle.net/11449/36919
dc.identifier.wosWOS:000169043800009
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titlePhase separation in pyrex glass by hydrothermal treatment: evidence from micro-Raman spectroscopyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4284809342546287
unesp.author.orcid0000-0001-8326-1465[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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