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Hierarchical Porous Silicas for Chromatographic Applications Obtained by Pseudomorphic Synthesis

Published online by Cambridge University Press:  01 February 2011

Anne Galarneau ,
Julien Iapichella ,
Carolina Petitto ,
Francesco Di Renzo  and
François Fajula
Anne Galarneau
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1, Institut Gerhardt. Ecole Nationale Supérieure de Chimie, 8, Rue de l'Ecole Normale 34296 Montpellier Cedex 5, Francefajula@cit.enscm.fr
Julien Iapichella
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1, Institut Gerhardt. Ecole Nationale Supérieure de Chimie, 8, Rue de l'Ecole Normale 34296 Montpellier Cedex 5, Francefajula@cit.enscm.fr
Carolina Petitto
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1, Institut Gerhardt. Ecole Nationale Supérieure de Chimie, 8, Rue de l'Ecole Normale 34296 Montpellier Cedex 5, Francefajula@cit.enscm.fr
Francesco Di Renzo
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1, Institut Gerhardt. Ecole Nationale Supérieure de Chimie, 8, Rue de l'Ecole Normale 34296 Montpellier Cedex 5, Francefajula@cit.enscm.fr
François Fajula
Affiliation:
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1, Institut Gerhardt. Ecole Nationale Supérieure de Chimie, 8, Rue de l'Ecole Normale 34296 Montpellier Cedex 5, Francefajula@cit.enscm.fr
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Abstract

Pseudomorphic transformation of pre-shaped silica beads into MCM-41 and MCM-48 is introduced as a new versatile procedure to independently control and finely tune the textural characteristics of advanced high-performance chromatographic supports at nano- and micrometer scale. The reaction takes place in the intergranular porosity of the parent silica-gel particle which acts as a nanoreactor. Because the resulting hybrid mesophase is metastable in its synthesis medium, the kinetics of each of the elementary steps – diffusion of hydroxide and surfactant, dissolution of parent silica, self-assembly, condensation of the new silica network-must be precisely controlled. In the paper examples are given of the preparation of discrete homodisperse spherical particles of MCM-41 and MCM-48, with pore sizes in the range 4 to 9 nm, form different silica sources.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE12.3
Copyright
Copyright © Materials Research Society 2005

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References

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