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Use of DSC to determine the structure of sol-gel derived glasses

E.P. Roth,C.J. Brinker-1986-01-01-OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)
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TL;DRAbstract

Differential scanning calorimetry (DSC) has been used to measure quantitative enthalpic changes which accompany gel densification in sol-gel derived glasses. These results, along with measurements of shrinkage and weight loss, were used to identify densification mechanisms. Gel densification is a complex, multistage process consisting of: (1) capillary contraction; (2) condensation polymerization; (3) structural relaxation; and (4) viscous sintering. Gel composition and preparation procedures were varied in order to more clearly observe and quantify some of these densification mechanisms. In particular, metastable defect species were identified by the use of quantitative DSC and Raman spectroscopy.

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Differential scanning calorimetry (DSC) has been used to measure quantitative enthalpic changes which accompany gel densification in sol-gel derived glasses. These results, along with measurements of shrinkage and weight loss, were used to identify densification mechanisms. Gel densification is a complex, multistage process consisting of: (1) capillary contraction; (2) condensation polymerization; (3) structural relaxation; and (4) viscous sintering. Gel composition and preparation procedures were varied in order to more clearly observe and quantify some of these densification mechanisms. In particular, metastable defect species were identified by the use of quantitative DSC and Raman spectroscopy.

Keywords

Differential scanning calorimetryMaterials scienceShrinkageSol-gelMetastabilitySinteringPolymerizationRaman spectroscopy

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