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Precipitation of Spinel Iron Oxide : Nanoparticle Size Control

Published online by Cambridge University Press:  10 February 2011

J. P. Jolivet ,
L. Vayssieres ,
C. Chaneac  and
E. Tronc
J. P. Jolivet
Affiliation:
Chimie de Ia Matiére Condensée, CNRS URA 1466, Université P. et M. Curie4, Place Jussieu, T. 54 E. 5, 75 252 Paris Cedex 05, France
L. Vayssieres
Affiliation:
Chimie de Ia Matiére Condensée, CNRS URA 1466, Université P. et M. Curie4, Place Jussieu, T. 54 E. 5, 75 252 Paris Cedex 05, France
C. Chaneac
Affiliation:
Chimie de Ia Matiére Condensée, CNRS URA 1466, Université P. et M. Curie4, Place Jussieu, T. 54 E. 5, 75 252 Paris Cedex 05, France
E. Tronc
Affiliation:
Chimie de Ia Matiére Condensée, CNRS URA 1466, Université P. et M. Curie4, Place Jussieu, T. 54 E. 5, 75 252 Paris Cedex 05, France
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Abstract

The mean particle size of magnetite precipitated in aqueous solution can be adjusted and stabilized against ripening over a large nanometric range (1.5 to 12.5 nm) by controlling the pH and the ionic strength imposed by a non-complexing salt in the precipitation medium. The higher the pH and the ionic strength are, the smaller the particle size is. An explanation for this phenomenon is based on the lowering of the oxide-solution interracial tension due to the surface electrostatic charge increase. A critical pH value corresponding to the saturation of the interface is defined and calculated. When the precipitation is effected above this critical pH value, the spontaneous decrease in surface area by ripening is avoided and, for a given ionic strength, the particle size depends only on the acidity. This model correlates well with the experimental results. This provides the first experimental example of thermodynamic stabilization of oxide nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 145
Copyright
Copyright © Materials Research Society 1997

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