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Sol-gel synthesis of silica–based mesoporous powders

Published online by Cambridge University Press:  01 February 2011

Lidia Armelao ,
Gregorio Bottaro ,
Renzo Campostrini ,
Stefano Gialanella ,
Marco Ischia ,
Fabrizia Poli  and
Eugenio Tondello
Lidia Armelao
Affiliation:
ISTM-CNR and INSTM - Department of Chemistry - University of Padova -, Italy
Gregorio Bottaro
Affiliation:
ISTM-CNR and INSTM - Department of Chemistry - University of Padova -, Italy
Renzo Campostrini
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, Italy
Stefano Gialanella
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, Italy
Marco Ischia
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, Italy
Fabrizia Poli
Affiliation:
Department of Chemistry and INSTM - University of Padova - Italy
Eugenio Tondello
Affiliation:
Department of Chemistry and INSTM - University of Padova - Italy
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Abstract

Mesoporous silica powders have been synthesized starting from aqueous solutions of Si(OCH2CH3)4 (TEOS) under acidic conditions, using non-ionic alkyl poly(ethylene oxide) oligomer (Brij76) as a structure-directing agent. Template removal was performed by thermal treatment in air as well as by ethanol extraction. The annealing process (400 - 600°C) resulted in more efficient elimination of the organic molecules, thus yielding hexagonal (p6mm) mesopor-ous materials with pore volume and specific surface area ranging between 0.58 – 0.41 cm3/g and 900 – 700 m2/g, respectively. The systems were characterized by X-Ray Diffraction (XRD), N2 BET adsorption, Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). Particular attention was focused on the evolution of the system mesostructural and porous features as a function of the template removal procedure. The obtained mesoporous networks are suitable as matrices for the development of nanocomposite systems in which the dispersion or the growth of various guest species (clusters, molecules…) can be addressed into the host mesopores.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF1.5
Copyright
Copyright © Materials Research Society 2005

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References

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