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Behavior of Nanoparticle Clouds Around a Magnetized Microsphere Under Magnetic and Flow Fields by Magnet, Cécilia; Kuzhir, Pavel; Bossis, Georges; Meunier, Alain; Nave, Sebastien; Zubarev, Andrey; Lomenech, Claire; Bashtovoi, Victor is a scholarly article available to read on EtoBox.

What is Behavior of Nanoparticle Clouds Around a Magnetized Microsphere Under Magnetic and Flow Fields about?

When a micron-sized magnetizable particle is introduced into a suspension of nanosized magnetic particles, the nanoparticles accumulate around the microparticle and form thick anisotropic clouds extended in the direction of the applied magnetic field. This phenomenon promotes colloidal stabilization of bimodal magnetic suspensions and allows efficient magnetic separation of nanoparticles used in bioanalysis and water purification. In the present work, size and shape of nanoparticle clouds under the simultaneous action of an external uniform magnetic field and the flow have been studied in details. In experiments, dilute suspension of iron oxide nanoclusters (of a mean diameter of 60 nm) was pushed through a thin slit channel with the nickel microspheres (of a mean diameter of 50$\mu$m) attached to the channel wall. The behavior of nanocluster clouds was observed in the steady state using an optical microscope. In the presence of strong enough flow, the size of the clouds monotonically decreases with increasing flow speed in both longitudinal and transverse magnetic fields. This is qualitatively explained by enhancement of hydrodynamic forces washing the nanoclusters away from the c

Author

Magnet, Cécilia; Kuzhir, Pavel; Bossis, Georges; Meunier, Alain; Nave, Sebastien; Zubarev, Andrey; Lomenech, Claire; Bashtovoi, Victor

Published

2014

Language

EN