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Continuous hydrothermal crystallization of α–Fe2O3 and Co3O4 nanoparticles

Published online by Cambridge University Press:  31 January 2011

Yalin Hao  and
Amyn S. Teja
Yalin Hao
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100
Amyn S. Teja
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100
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Abstract

Iron oxide (α–Fe2O3) and cobalt oxide (Co3O4) were produced via precipitation reactions carried out in a continuous hydrothermal apparatus. The resulting particles were nanometer-sized because of the high supersaturations generated when metal nitrate solutions are combined with sodium hydroxide or with hot, compressed water. The average particle size increased with the metal nitrate feed concentration and with residence time. A logarithmic relationship was obtained between the particle size and feed concentration and between particle size and residence time in the apparatus. The production of nanoparticles with narrow size distribution was shown to require low metal nitrate feed concentrations and short residence times. In the range of temperatures studied in this work, temperature apparently had no effect on the size except when cobalt nitrate was contacted with supercritical water in the absence of sodium hydroxide. In this case, large cobalt oxide particles were obtained when the temperature was above the critical temperature of water.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 2 , February 2003 , pp. 415 - 422
Copyright
Copyright © Materials Research Society 2003

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