The ethanol-free hydrolysis of tetraethyl-orthosilicate (TEOS) at normalities N = 0.1 and N = 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 656 cm1 Raman peak of TEOS increases with decreasing strength of the acid catalyst for N = 0.1, whereas, at lower acid concentrations, longer hydrolysis times are needed, irrespective of catalyst type.
Micro-Raman monitoring of solvent-free TEOS hydrolysis / Marino, Iari Gabriel; Lottici, Pier Paolo; Bersani, Danilo; Raschella', Raffaella; Lorenzi, Andrea; Montenero, Angelo. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - 351:(2005), pp. 495-498. [10.1016/j.jnoncrysol.2004.11.023]
Micro-Raman monitoring of solvent-free TEOS hydrolysis
MARINO, Iari Gabriel;LOTTICI, Pier Paolo;BERSANI, Danilo;RASCHELLA', Raffaella;LORENZI, Andrea;MONTENERO, Angelo
2005-01-01
Abstract
The ethanol-free hydrolysis of tetraethyl-orthosilicate (TEOS) at normalities N = 0.1 and N = 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 656 cm1 Raman peak of TEOS increases with decreasing strength of the acid catalyst for N = 0.1, whereas, at lower acid concentrations, longer hydrolysis times are needed, irrespective of catalyst type.| File | Dimensione | Formato | |
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