Published 13/11/2013
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Optimizing the magnetic response of suspensions by tailoring the spatial distribution of the particle magnetic material

G.Bossis , P.Kuzhir , M.Lopez-Lopez , L.Rodriguez , J.Duran

Keywords
Introduction
Resume
We report an experimental enhancement of the magnetic susceptibility of suspensions of particles, related to the spatial distribution of the magnetic phase in the particles. At low field the susceptibility of suspensions of nickel-coated diamagnetic spheres was approximately 75% higher than that of suspensions of solid nickel spheres with the same nickel content. This result was corroborated by magnetostatics theory and simulation. The distribution of the magnetic phase in a shell also led to an improvement of the field-induced rheological response of the suspensions.
Method
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Results
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Conclusion
The distribution of the magnetic phase in a shell also led to an improvement of the field-induced rheological response of the suspensions. In particular, we demonstrate both experimental and theoretically, that the magnetic susceptibility of a suspension of hollow magnetic spheres i. e. diamagnetic-coreferromagnetic-shell particles, is enhanced in comparison to that of a suspension of solid ferromagnetic spheres with the same total amount of magnetic material.
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