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Sol-To-Gel Transition in Reversed Micelles Microemulsions I. A New Route to Produce Monolithic Metal-Organic Derived Gels

Published online by Cambridge University Press:  25 February 2011

C. Guizard ,
M. Stitou ,
A. Larbot ,
L. Cot  and
J. Rouviere
C. Guizard
Affiliation:
Laboratoire de Physicochimie des Matériaux CNRS UA 407, ENSCM, 8 rue de L'Ecole Normale 34000-MONTPELLIER, (France)
M. Stitou
Affiliation:
Laboratoire de Physicochimie des Matériaux CNRS UA 407, ENSCM, 8 rue de L'Ecole Normale 34000-MONTPELLIER, (France)
A. Larbot
Affiliation:
Laboratoire de Physicochimie des Matériaux CNRS UA 407, ENSCM, 8 rue de L'Ecole Normale 34000-MONTPELLIER, (France)
L. Cot
Affiliation:
Laboratoire de Physicochimie des Matériaux CNRS UA 407, ENSCM, 8 rue de L'Ecole Normale 34000-MONTPELLIER, (France)
J. Rouviere
Affiliation:
Laboratoire de Physicochimie des Systèmes Polyphasés CNRS UA 330, USTL, Place Eugène Bataillon 34000-MONTPELLIER, (France).
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Abstract

A new versatile method to prepare monolithic metal-organic derived gels is presented in which the sol-to-gel transition is achieved through hydrolysis and condensation reactions in a reversed micelles microemulsion. C7 to C10 alkanes were used as solvents for the reaction and water molecules were solubilized using a non ionic surfactant. The general rules governing the sol-to-gel transition for several alkoxides such as Ti (OPri)4, Ti(OBut)4 and Fe(OPri)3 have been laid down and the exchange of water between reversed micelles related to hydrolysis and condensation rates has been investigated. Hydrolysis and condensation kinetics were monitored for different water/surfactant ratio u-sing gas chromatography. At the sol state growing of colloidal particles is mainly affected by the structure of the water inside the reversed micelles. It has been demonstrated using light scattering measurements that gelation times depend on the particle size evolution into the sol.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 115
Copyright
Copyright © Materials Research Society 1988

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References

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