Magnetophoresis of nonmagnetic particles in ferrofluids

Details Magnetophoresis of nonmagnetic particles in ferrofluids Magnetophoresis of nonmagnetic particles in ferrofluids

2006-11-15

arxiv.org/abs/physics/0611151v2

J. Phys. Chem. C 111, 10785 (2007)

Physics

Chemical Physics

24 pages, 7 figures

Scientific paper

Ferrofluids containing nonmagnetic particles are called inverse ferrofluids. On the basis of the Ewald-Kornfeld formulation and the Maxwell-Garnett theory, we theoretically investigate the magnetophoretic force exerting on the nonmagnetic particles in inverse ferrofluids due to the presence of a nonuniform magnetic field, by taking into account the structural transition and long-range interaction. We numerically demonstrate that the force can be adjusted by choosing appropriate lattices, volume fractions, geometric shapes, and conductivities of the nonmagnetic particles, as well as frequencies of external magnetic fields.

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