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Kinetic Study of the Reactions of Chlorosilanes with Porous Vycor Glass

Kim, Soojin and Gavalas, George R. (1993) Kinetic Study of the Reactions of Chlorosilanes with Porous Vycor Glass. Journal of Colloid and Interface Science, 161 (1). pp. 6-18. ISSN 0021-9797.

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The alternating reactions of SiCl_4 and H_2O with the surface of Vycor glass have been studied by thermogravimetric analysis at 400-600°C. The results are interpreted by postulating two types of silanol groups (Si-OH) on the Vycor surface, paired and isolated. Reaction of SiCl_4 with paired silanols proceeds by competing steps which control the total extent of silylation. Upon reaction with H_2O, all surface Si-Cl groups are hydrolyzed, reproducing Si-OH. Simultaneous silanol-silanol and silanol-surface chloride condensations eliminate H_2O or HCl to form new Si-O-Si bridges with final product silica. A kinetic model incorporating the silylation, hydrolysis, and condensation steps describes well the TGA data.

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Gavalas, George R.0000-0003-1468-6835
Additional Information:© 1993 Academic Press. Received Mach 15, 1993; accepted June 22, 1993. The authors appreciate the funding of this work by the Department of Energy under the University Coal Research Program, Grant DE-FG22-92PC92525.
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Department of Energy (DOE)DE-FG22-92PC92525
Issue or Number:1
Record Number:CaltechAUTHORS:20151007-090428227
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Official Citation:Soojin Kim, George R. Gavalas, Kinetic Study of the Reactions of Chlorosilanes with Porous Vycor Glass, Journal of Colloid and Interface Science, Volume 161, Issue 1, November 1993, Pages 6-18, ISSN 0021-9797, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60852
Deposited By: George Porter
Deposited On:07 Oct 2015 17:40
Last Modified:03 Oct 2019 09:01

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