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A General Nonhydrolytic Sol‐Gel Route to Oxides

Published online by Cambridge University Press:  21 February 2011

Sylvie Acosta ,
Pascal Arnal ,
Robert J.P. Corriu ,
Dominique Leclercq ,
P. Hubert Mutin  and
Andre Vioux
Sylvie Acosta
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
Pascal Arnal
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
Robert J.P. Corriu
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
Dominique Leclercq
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
P. Hubert Mutin
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
Andre Vioux
Affiliation:
UMR 44, CNRS/ Rhône‐Poulenc/ Université Montpellier Π, case 007, Université Montpellier Π, Place E. Bataillon, 34095 Montpellier cedex 5, France.
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Abstract

A nonhydrolytic sol‐gel route based on the condensation between chlorides and oxygen donors such as ethers and alkoxides is presented. Four examples, silica, alumina, titania and binary oxides in the Al/Si system show that this is a general route. The mechanism of this condensation is completely different from the one of classical sol‐gel process, since it implies nucleophilic substitution at the carbon center instead of the metal center. As a consequence, the differences in reactivity between different metals are reduced. In addition, the structure of the precursors may be retained in the gel. Thus, the nonhydrolytic sol‐gel process is very efficient for the preparation of homogeneous bicomponent oxides. Futhermore, nonhydrated gels are formed, which allowed us to prepare amorphous aluminas with high surface areas.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 43
Copyright
Copyright © Materials Research Society 1998

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References

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