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Influence of reduction mechanism on the morphology of cobalt nanoparticles in a silica-gel matrix

Published online by Cambridge University Press:  31 January 2011

A. Basumallick ,
G. C. Das  and
S. Mukherjee
A. Basumallick
Affiliation:
Department of Metallurgical Engineering, Bengal Engineering College (D.U.), Howrah-711 103, India
G. C. Das
Affiliation:
Department of Metallurgical Engineering, Jadavpur University, Calcutta-700 032, India
S. Mukherjee
Affiliation:
Department of Metallurgical Engineering, Jadavpur University, Calcutta-700 032, India
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Extract

Cobalt-chloride- and dextrose-containing silica gels were reduced in situ under nitrogen atmosphere in the temperature range of 600 to 950 °C. Analysis of kinetic data on the in situ reduction shows that, in the temperature range of 600 to 750 °C, the contracting geometry type and, in the temperature range of 800 to 950 °C, the nucleation and growth type of mechanisms remain operative. The shape and size of the reduced cobalt nanoparticles in the silica matrix was studied by examining the transmission electron micrographs of the reduced Co/SiO2 samples. The morphology of the reduced metallic particles was found to be influenced by the change in reduction mechanism.

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Articles
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Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 102 - 106
Copyright
Copyright © Materials Research Society 2000

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References

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