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Formation of hybrid colloids by suspension polycondensation in the presence of hydrophilic block copolymers

Published online by Cambridge University Press:  01 February 2011

Corine Gerardin ,
Valérie Buissette ,
François Gaudemet ,
Olivier Anthony ,
Nicolas Sanson ,
Francesco Direnzo  and
François Fajula
Corine Gerardin
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS ENSCM, 8, rue de l'Ecole Normale, 34296 Montpellier cedex 5, France. CNRS Rhodia Complex Fluids Laboratory, Rhodia Inc., Cranbury, NJ 08512, USA.
Valérie Buissette
Affiliation:
CNRS Rhodia Complex Fluids Laboratory, Rhodia Inc., Cranbury, NJ 08512, USA.
François Gaudemet
Affiliation:
CNRS Rhodia Complex Fluids Laboratory, Rhodia Inc., Cranbury, NJ 08512, USA.
Olivier Anthony
Affiliation:
CNRS Rhodia Complex Fluids Laboratory, Rhodia Inc., Cranbury, NJ 08512, USA.
Nicolas Sanson
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS ENSCM, 8, rue de l'Ecole Normale, 34296 Montpellier cedex 5, France.
Francesco Direnzo
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS ENSCM, 8, rue de l'Ecole Normale, 34296 Montpellier cedex 5, France.
François Fajula
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS ENSCM, 8, rue de l'Ecole Normale, 34296 Montpellier cedex 5, France.
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Abstract

Double hydrophilic block copolymers were used to control the growth of inorganic particles and directly prepare hybrid colloidal suspensions. Colloids of metal hydrous oxides were obtained by forced hydrolysis of metal ions in presence of the copolymers. The block copolymers contain a metal-complexing polyelectrolyte block and a stabilizing neutral block. The role of the first block is to ensure a controlled growth of the inorganic phase, while simultaneously, the second block ensures the colloidal stabilization. Phase diagrams presenting the conditions under which precipitation is inhibited are established. The nanoparticles are then characterized in terms of sizes, morphologies and surface charges. The main parameters controlling the size were identified: the copolymer-to-metal ratio and the metal prehydrolysis ratio. The synthesis steps were characterized. First, a key step of induced micellization of the hydrophilic copolymers leads to hybrid core-shell assemblies. The second step consists in mineralization of the micellar core. The suspension polycondensation leads to hairy particles whose morphologies depend on the nature of the metal and on synthesis parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 726: Symposium Q – Hybrid Organic-Inorganic Materials , 2002 , Q7.5
Copyright
Copyright © Materials Research Society 2002

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