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Magnetic behavior of coated superparamagnetic iron oxide nanoparticles in ferrofluids

  • W. Voit (a1) (a2), D. K. Kim (a3), W. Zapka (a2), M. Muhammed (a3) and K. V. Rao (a1)
  • DOI:
  • Published online: 01 March 2011

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.

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