Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9778211 | Journal of Non-Crystalline Solids | 2005 | 4 Pages |
Abstract
The ethanol-free hydrolysis of tetraethyl-orthosilicate (TEOS) at normalities NÂ =Â 0.1 and NÂ =Â 0.01 of HBr, HCl, HNO3 and H2SO4 has been studied, during the first stages of the process by in situ micro-Raman spectroscopy, following the intensities of TEOS and ethanol characteristic vibrational features. The time required for a complete vanishing of the 656Â cmâ1 Raman peak of TEOS increases with decreasing strength of the acid catalyst for NÂ =Â 0.1, whereas, at lower acid concentrations, longer hydrolysis times are needed, irrespective of catalyst type.
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Authors
Iari-Gabriel Marino, Pier Paolo Lottici, Danilo Bersani, Raffaella Raschellà , Andrea Lorenzi, Angelo Montenero,