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|Title:||Closed-loop magnetic separation of nanoparticles on a packed bed of spheres|
Wereley, N. M.
|Publisher:||American Institute of Physics Inc.|
|Citation:||Closed-loop magnetic separation of nanoparticles on a packed bed of spheres / C. Magnet, M. Akouala, P. Kuzhir, et al. — DOI 10.1063/1.4913938 // Journal of Applied Physics. — 2015. — Vol. 117. — Iss. 17. — 17C719.|
|Abstract:||In this work, we consider magnetic separation of iron oxide nanoparticles when a nanoparticle suspension (diluted ferrofluid) passes through a closed-loop filter composed of a packed bed of micro-beads magnetized by an externally applied magnetic field. We show that the capture of nanoparticles of a size as small as 60 nm is easily achieved at low-to-moderate magnetic fields (16-32 kA/m) thanks to relatively strong magnetic interactions between them. The key parameter governing the capture process is the Mason number - the ratio of hydrodynamic-to-magnetic forces exerted to nanoparticles. The filter efficiency, Λ, defined through the ratio of the inlet-to-outlet concentration shows a power-law dependency on Mason number, Λ∞Ma-0.83, in the range of 102<Ma<104. The proposed theoretical model allows a correct prediction of the Mason number dependency of the filter efficiency. The obtained results could be of potential interest for water purification systems based on chemical adsorption of micro-pollutants on magnetic nanoparticles, followed by magnetic separation of the nanoparticles. © 2015 AIP Publishing LLC.|
APPLIED MAGNETIC FIELDS
IRON OXIDE NANOPARTICLE
PACKED BED OF SPHERES
WATER PURIFICATION SYSTEMS
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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