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Iron Oxide / Silica Nanocomposites

Published online by Cambridge University Press:  01 February 2011

Michael Kröll ,
Markus Pridöhl  and
Guido Zimmermann
Michael Kröll
Affiliation:
Degussa AG, Creavis Technologies & Innovation, Advanced Nanomaterials, Rodenbacher Chaussee 4 63457 Hanau, Germany
Markus Pridöhl
Affiliation:
Degussa AG, Creavis Technologies & Innovation, Advanced Nanomaterials, Rodenbacher Chaussee 4 63457 Hanau, Germany
Guido Zimmermann
Affiliation:
Degussa AG, Creavis Technologies & Innovation, Advanced Nanomaterials, Rodenbacher Chaussee 4 63457 Hanau, Germany
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Abstract

Nanoscaled Iron Oxide / Silica Nanocomposite particles are produced in a pyrogenic process. The iron oxide crystallites are separated from each other and covered with a silica layer. Their size can easily be controlled by adjusting the process parameters. The amount of iron oxide can also be controlled within certain limits. Due to their size these isolated magnetic particles show a superparamagnetic behaviour. The saturation magnetisation measured depends almost linearly on the size of the iron oxide crystallites showing an increase in the magnetisation with increasing particle size. Due to the composite structure the iron oxide is chemically stable. Furthermore it shows a thermal stability which is unusual for the given oxides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L4.3
Copyright
Copyright © Materials Research Society 2004

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References

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