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Nanometer-Scale Iron Oxide Magnetic Particles: Synthesis and Magnetic Properties

Published online by Cambridge University Press:  28 February 2011

John K. Vassiliou ,
Vivek Mehrotra ,
Michael W. Russell  and
Emmanuel P. Giannelis
John K. Vassiliou
Affiliation:
Dep. of Physics, Villanova University, Villanova, PA
Vivek Mehrotra
Affiliation:
Materials Science Center and Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
Michael W. Russell
Affiliation:
Materials Science Center and Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
Emmanuel P. Giannelis
Affiliation:
Materials Science Center and Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853
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Abstract

Nanometer-scale iron oxide magnetic particles have been formed in the porous network of a cross-linked polymer matrix by ion exchange and subsequent hydrolysis. The oxide particles are uniform, well-dispersed and spherical with a diameter ranging between 30 and 1200 Å depending on the synthesis conditions. The DC magnetic susceptibility, measured between 4 and 300 K, continuously increases with decreasing temperature and tends to saturate at low temperatures. Composites containing iron oxide particles with an average diameter of 80 Å exhibit superparamagnetism while those on the order of 1000 Å undergo an antiferromagnetic-type transition at 33 K. The magnetic susceptibility is critically dependent upon the particle size and the strength of the magnetic field.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 561
Copyright
Copyright © Materials Research Society 1991

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References

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