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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 chloridesand oxygen donors such as ethers and alkoxides is presented. Four examples,silica, alumina, titania and binary oxides in the Al/Si system show thatthis is a general route. The mechanism of this condensation is completelydifferent from the one of classical sol‐gel process, since it impliesnucleophilic substitution at the carbon center instead of the metal center.As a consequence, the differences in reactivity between different metals arereduced. In addition, the structure of the precursors may be retained in thegel. Thus, the nonhydrolytic sol‐gel process is very efficient for thepreparation of homogeneous bicomponent oxides. Futhermore, nonhydrated gelsare formed, which allowed us to prepare amorphous aluminas with high surfaceareas.

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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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