Spectrofluorimetric studies of water content in sol—gel processing of TMOS

Marek Wasiucionek , M.W. Breiter

Abstract

Measurements of water during acid-catalyzed sol—gel processing TMOS have been carried out. The compositions of the initial sols correspond to TMOS:H2O:MeOH=1:n:3, where n = 1, 2, 4, 6, 8, 15 and 25. Pyranine, a sensitive water photoprobe enables monitoring fast water content changes. Initial decrease of water content due to hydrolysis of TMOS was fast for sols corresponding to (n ≥ 15). A minimum was reached in about 1 min. For n ≤ 2 these changes were much slower. Subsequent increase of water was caused by condensation reactions. Changes of water content and mass which occur more rapidly after pin-holing the seals of cuvettes containing sols—gels are caused by evaporation of pore liquid. The results of the numerical fits of these changes suggest that this liquid consists mainly of H2O and MeOH.
Author Marek Wasiucionek (FP / SSID)
Marek Wasiucionek,,
- Solid State Ionics Division
, M.W. Breiter - [Technische Universitat Wien]
M.W. Breiter,,
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Journal seriesJournal of Non-Crystalline Solids, ISSN 0022-3093
Issue year1997
Vol220
No1
Pages52-57
ASJC Classification2505 Materials Chemistry; 3104 Condensed Matter Physics; 2503 Ceramics and Composites; 2504 Electronic, Optical and Magnetic Materials
DOIDOI:10.1016/S0022-3093(97)00233-0
URL http://www.sciencedirect.com/science/article/pii/S0022309397002330
Score (nominal)35
Score sourcejournalList
Publication indicators Scopus Citations = 11; WoS Citations = 11; GS Citations = 12.0; Scopus SNIP (Source Normalised Impact per Paper): 1999 = 0.956; WoS Impact Factor: 2006 = 1.362 (2) - 2007=1.494 (5)
Citation count*12 (2014-12-12)
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