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Magnetic behavior of coated superparamagnetic iron oxide nanoparticles in ferrofluids

Published online by Cambridge University Press:  21 March 2011

W. Voit ,
D. K. Kim ,
W. Zapka ,
M. Muhammed  and
K. V. Rao
W. Voit
Affiliation:
Engineering Materials Physics Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden XaarJet AB, SE-175 26 Järfälla, Sweden
D. K. Kim
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
W. Zapka
Affiliation:
XaarJet AB, SE-175 26 Järfälla, Sweden
M. Muhammed
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
K. V. Rao
Affiliation:
Engineering Materials Physics Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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Abstract

We present a study on the magnetic behavior of nanosized iron oxide particles coated with different surfactants (sodium oleate, PVA and starch) in a ferrofluid. The effect of the coating material, and different particle concentrations in the ferrofluid have been magnetically investigated to determine the effective magnetic particle size and possible interaction. The superparamagnetic iron oxide particles, synthesized by a controlled co-precipitation technique, are found to contain magnetite (Fe3O4) as a main phase with a narrow physical particle size distribution between 6 and 8 nm. The mean effective magnetic size of the particles in different ferrofluid systems are estimated to be around 4-5 nm which is smaller than the physical particle size. On a 10% dilution in the starch coated ferrofluid we observe a decrease in the blocking temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y7.8
Copyright
Copyright © Materials Research Society 2001

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References

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