Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-20T00:47:13.486Z Has data issue: false hasContentIssue false
  • English
  • Français

A Comparison of Tio2-Sio2 Aerogels and Xerogels

Published online by Cambridge University Press:  28 February 2011

G. Cogliati ,
M. Guglielmi ,
T.M. Che  and
T.J. Clark
G. Cogliati
Affiliation:
TEMAV, Laboratori di Medicina, Bologna, Italy.
M. Guglielmi
Affiliation:
Universita di Padova, Dipartimento di Ingegneria Meccanica, Padova, Italy.
T.M. Che
Affiliation:
Enimont America Inc., Advanced Materials Department, Monmouth Junction, N.J. 08852
T.J. Clark
Affiliation:
Enimont America Inc., Advanced Materials Department, Monmouth Junction, N.J. 08852
Get access

Abstract

Titania-silica gels containing up to 30% titania have been obtained from silicon and titanium alkoxides and from silicon alkoxides and TiCl4. These gels were then processed by normal drying and by hypercritical methods. The thermal evolution of these gel/glass systems, specifically with respect to crystallization behavior has been followed using x-ray diffraction and Raman spectroscopy. From these studies, it was found that not only the different chemistries, but also the different processing methods significantly affect the microstructure of these titania-silica systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 329
Copyright
Copyright © Materials Research Society 1990

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.)

References

REFERENCES

(1) Schultz, P.C. and Smyth, H.T. in Amorphous Materials, edited by Douglas, and Ellis, (Wiley, New York, 1972) p. 453.Google Scholar
(2) Kamiya, K. and Sakka, S., J. Non-Cryst. Solids 52, 357 (1982).Google Scholar
(3) Brinker, C.J. and Harrington, M.S., Solar Energy Materials 5, 159 (1981).Google Scholar
(4) Melpolder, S.M., West, A.W., Barnes, C.L., and Blanton, T.N., “A study of phase transformations in TiO2/SiO2 sol-gel films as a function of compositions and heat treatment. ” (to be published In J. Mater. Sci.)Google Scholar
(5) Kamiya, K. and Sakka, S., J. Mater. Sci., 15, 2937 (1980).Google Scholar
(6) Yoldas, B. E., J. Non-Cryst. Solids 38&39, 81 (1980);Google Scholar
U.S. Patent 4,278,632 (July 14, 1981).Google Scholar
(7) Gonzalez-Oliver, C.J.R., James, P.F. and Rawson, H., J. Non-Cryst. Solids 48, 129 (1982).Google Scholar
(8) Deng, Z., Breval, E. and Pantano, C. G., J. Non-Cryst. Solids, 100, 364 (1988).Google Scholar
(9) Cheng, Y.C. and Hench, L.L., in Better Ceramics Through Chemistry III, edited by Brinker, C.J., Clark, D.E. and Ulrich, D.R. (Mater. Res. Soc. Proc. 121, Pittsburgh, PA 1988) pp. 596;Google Scholar
In the Proceedings of the 4th Intn'l Conf. on Ultrastructure Processing of Ceramics, Glasses and Composites held Feb 1989 (to be published).Google Scholar
(10) Zarzycki, J. in Ultrastructure Processing of Ceramic Glasses and Composites, edited by Hench, L.L. and Ulrich, D.R. (Wiley, New York, 1984) pp. 27–42.Google Scholar
(11) Che, T.M., Rafalko, J.J. and Dorain, P.B., in Ultrastructure Processing of Advanced Ceramics, edited by Mackenzie, J.D. and Ulrich, D.R. (J. Wiley and Sons, Inc., New York, 1988), p. 827.Google Scholar
(12) Dorain, P.B., Rafalko, J.J., Feeney, J.E., Forbes, C.E., Carney, R.V. and Che, T.M., in Better Ceramics Through Chemistry III. edited by Brinker, C.J., Clark, D.E. and Ulrich, D.R. (Mater. Res. Soc. Proc. 121, Pittsburgh, PA 1988) pp. 523–526.Google Scholar
(13) Cogliati, G. and Bezzi, G., Italian Pat. 19403A/89 (Feb. 10, 1989).Google Scholar
(14) Exarhos, G. J. and Pawlewicz, W. T., Applied Optics 23 (12), 1986 (1984).Google Scholar
(15) Pawlewicz, W.T., Exarhos, G.J., and Conaway, W.E., Applied Optics 22 (12), 1837 (1983).Google Scholar
(16) Best, M.F. and Condrate, R.A. Sr., J. Mater. Sci. Letts. 4, 994 (1985).Google Scholar