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Iron-silica and nickel-silica nanocomposites prepared by high energy ball milling

Published online by Cambridge University Press:  31 January 2011

Anna Corrias ,
Guido Ennas ,
Anna Musinu ,
Giorgio Paschina  and
Daniela Zedda
Anna Corrias
Affiliation:
Dipartimento di Scienze Chimiche, Università di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
Guido Ennas
Affiliation:
Dipartimento di Scienze Chimiche, Università di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
Anna Musinu
Affiliation:
Dipartimento di Scienze Chimiche, Università di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
Giorgio Paschina
Affiliation:
Dipartimento di Scienze Chimiche, Università di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
Daniela Zedda
Affiliation:
Dipartimento di Scienze Chimiche, Università di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
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Abstract

Metal-silica nanocomposites with different metal volume fractions have been prepared via solid state exchange reactions induced by ball milling followed by a reduction treatment in H2 flux. In nickel-containing mixtures oxygen transfers directly from NiO to Si while NiO is reduced to Ni. When NiO is present in a large ratio, its excess can be reduced by a thermal treatment in H2 flux. Nickel crystallites are obtained with nanometer size in the milling process and there is no significant growth during thermal treatment. Similar process conditions applied to Fe-containing mixtures give rise to a more complex reaction path which prevents the complete conversion of Fe(III) to Fe. Nickel-silica and iron-silica nanocomposites are also produced by ball milling mixtures of either nickel or iron with amorphous silica.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2767 - 2772
Copyright
Copyright © Materials Research Society 1997

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