Structure of SiO2-MgO-Na2O glasses by FTIR, Raman and Si-29 MAS NMR

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dc.contributor.authorSilva, A. M. B.en
dc.contributor.authorQueiroz, C. M.en
dc.contributor.authorAgathopoulos, S.en
dc.contributor.authorCorreia, R. N.en
dc.contributor.authorFernandes, M. H. V.en
dc.contributor.authorOliveira, J. M.en
dc.date.accessioned2015-11-24T17:38:46Z
dc.date.available2015-11-24T17:38:46Z
dc.identifier.issn0022-2860-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/14545
dc.rightsDefault Licence-
dc.subjectglassen
dc.subjectsilicateen
dc.subjectstructureen
dc.subjectspectroscopyen
dc.subjectsi-29 mas nmren
dc.subjectalkali-silicate-glassesen
dc.subjectaluminosilicate glassesen
dc.subjectbioactive glassesen
dc.subjectvitreous silicaen
dc.subjectspectroscopyen
dc.subjectmeltsen
dc.subjecttemperatureen
dc.subjectpressureen
dc.subjectspectraen
dc.subjectsio2en
dc.titleStructure of SiO2-MgO-Na2O glasses by FTIR, Raman and Si-29 MAS NMRen
heal.abstractThe study of SiO2-MgO-Na2O glasses is of particular relevance because some compositions can exhibit adequate properties for their use in biomedical applications. The influence of substitution of divalent Mg2+ ions for monovalent Na+ in the structure of silicate glasses which contain 55 mol% SiO2 was investigated by Magic-Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR), Raman spectroscopy and Fourier Transformed Infrared Spectroscopy (FTIR), in both qualitative and quantitative basis. According to the results, the structure of the glasses predominantly comprised Q(2) and Q(3) structural species. In glasses with more than 25% molar MgO, the substitution of Na2O by MgO promotes a significant change in the main silicate chain through a disproportionation reaction 2Q(2) reversible arrow Q(1) + Q(3), while glasses with less than 20% molar MgO show no evidence of silicate chain modifications. Information about the glass structure is of major importance for the understanding of the parameters that can control the biomedical properties, such as the chemical dissolution rate, pH and cell viability. (C) 2010 Elsevier B.V. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.molstruc.2010.11.023-
heal.identifier.secondary<Go to ISI>://000287075100003-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0022286010008896/1-s2.0-S0022286010008896-main.pdf?_tid=ba1a265d3cae8394fdd83288a38957e8&acdnat=1339492604_d083a132156e0d9d5fc86493f220e64b-
heal.journalNameJournal of Molecular Structureen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2011-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικώνel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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