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Monodisperse magnetic nanoparticles: Preparation and dispersion in water and oils

Published online by Cambridge University Press:  31 January 2011

S. Lefebure ,
E. Dubois ,
V. Cabuil ,
S. Neveu  and
R. Massart
S. Lefebure
Affiliation:
Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe “Colloïdes Magnétiques,”Université Pierre et Marie Curie, Paris, France
E. Dubois
Affiliation:
Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe “Colloïdes Magnétiques,”Université Pierre et Marie Curie, Paris, France
V. Cabuil*
Affiliation:
Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe “Colloïdes Magnétiques,”Université Pierre et Marie Curie, Paris, France
S. Neveu
Affiliation:
Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe “Colloïdes Magnétiques,”Université Pierre et Marie Curie, Paris, France
R. Massart
Affiliation:
Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe “Colloïdes Magnétiques,”Université Pierre et Marie Curie, Paris, France
*
a) Author to whom correspondence should be sent.
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Abstract

Nanometric maghemite and cobalt ferrite particles are chemically synthesized. The process produces particles polydisperse in size. The positive charges of their surface allow one to disperse them in aqueous acidic solutions and to obtain dispersions stabilized through electrostatic repulsions. Increasing acid concentration (in the range 0.1 to 0.5 mol.L−1), interparticles repulsions are screened and phase transitions are induced. Using this phenomenon, we describe a two-step size sorting process, in order to get significant amounts of nanometric monosized particles (with diameters monitored between typically 6 and 13 nm). As the surface of the latter is not modified by the size sorting process, usual procedures are used to disperse them in several aqueous or oily media.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2975 - 2981
Copyright
Copyright © Materials Research Society 1998

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