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Growth and Structure of Alumino-Silicate Polymers

Published online by Cambridge University Press:  25 February 2011

J. P. Boilot ,
J. C. Pouxviel ,
A. Dauger  and
A. Wright
J. P. Boilot
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, 91128 Palaiseau Cedex, (FRANCE)
J. C. Pouxviel
Affiliation:
Groupe de Chimie du Solide, Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, 91128 Palaiseau Cedex, (FRANCE)
A. Dauger
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, 87065 Limoges Cedex, (FRANCE)
A. Wright
Affiliation:
Institut Laue-Langevin, 156X. 38042 Grenoble Cedex, (FRANCE)
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Abstract

Gels have been prepared in the H2O, HOiPr, (BuO)2Al-O-Si(OEt)3 ternary phase diagram in a large range of oxide concentrations. The gelation time is governed by the initial water concentration, showing that the hydrolysis of Si-OR groups is the rate-determining process for the gelation.

The structure of clusters and the kinetics of aggregation have been studied by SANS. We observe mass-fractal particles characterized by a fractal dimension of 1.9, in agreement with the existence of a cluster-cluster aggregation mechanism during the gelation. The scattering curves exhibit a maximum intensity corresponding to interparticle correlations due to purely excluded-volume effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 121
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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