Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-13T13:28:56.805Z Has data issue: false hasContentIssue false
  • English
  • Français

Cross-Condensation Kinetics of Organically Modified Silica Sols+

Published online by Cambridge University Press:  10 February 2011

S. Prabakar  and
R. A. Assink
S. Prabakar
Affiliation:
Advanced Materials Laboratory, 1001 University Blvd., SE., #100, Albuquerque, NM 87106.
R. A. Assink
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185–1407.
Get access

Abstract

The hydrolysis and self- and cross-condensation kinetics of the hybrid sol tetraethoxysilane and ethyltriethoxysilane were investigated by high resolution 29 Si NMR spectroscopy. A kinetic model in which hydrolysis is reversible and condensation is irreversible was developed. We found excellent agreement between the product distributions measured by 29Si NMR spectroscopy and calculated by the model. The cross-condensation rates for each of the sols were intermediate to the condensation rates of the individual components. Calculations show that for these sols, the concentration of cross-condensed species is a weak function of the relative rates of self-condensation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 345
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

+

This work was supported by the United States Department of Energy under contract DE-AC04-94AL8500

References

1 Brinker, C.J. and Scherer, G.W., Sol-gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic, San Diego, 1990) p. 166, 840.Google Scholar
2 Sanchez, C. and Ribot, F., New J. Chem. 18, 1007 (1994).Google Scholar
3 Babonneau, F., New J. Chem. 18, 1065 (1994).Google Scholar
4 Prabakar, S., Assink, R-A., Raman, N.K., Myers, S.A. and Brinker, C.J. J. Non-Cryst. Solids (In Press).Google Scholar
5 Prabakar, S., Assink, R.A., Raman, N.K. and Brinker, C.J.. Mat. Res. Symp. Proc. 346, 979(1994).Google Scholar
6 Assink, R.A. and Kay, B.D., J. Non-Cryst. Solids 99, 359. (1988)Google Scholar
7 Prabakar, S. and Assink, R.A., J. Non-Cryst. Solids (Submitted)Google Scholar
8 Assink, R.A. and Kay, B.D., Colloids and Surfaces A: Physicochemical and Engineering Aspects 74, 1 (1993).Google Scholar