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Further investigations on Raman spectra of silica gel evolving toward glass

1984; Elsevier BV; Volume: 63; Issue: 1-2 Linguagem: Inglês

10.1016/0022-3093(84)90387-9

1873-4812

V. Gottardi, Massimo Guglielmi, A. Bertoluzza, C. Fagnano, Maria Antonietta Castiglione Morelli,

Mesoporous Materials and Catalysis

In a previous investigation a continuous evolution of silica gel structure toward that of v-SiO2 was verified by Raman spectroscopy. Modifications on the intensity of some Raman bands usually associated in the literature to "defects" of the structure were observed. In the present work the study has been extended to the transformation with temperature of silica gels obtained from tetraethoxysilane (TEOS) with different H2O/TEOS molar ratios. Raman spectra as well as thermogravimetric data are discussed in terms of the effect of this ratio on the local structure and the sintering process of silica gel.