Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102189
Title: Magnetic filtration of phase separating ferrofluids: From basic concepts to microfluidic device
Authors: Kuzhir, P.
Magnet, C.
Ezzaier, H.
Zubarev, A.
Bossis, G.
Issue Date: 2017
Publisher: Elsevier B.V.
Citation: Magnetic filtration of phase separating ferrofluids: From basic concepts to microfluidic device / P. Kuzhir, C. Magnet, H. Ezzaier, et al. — DOI 10.1016/j.jmmm.2016.08.054 // Journal of Magnetism and Magnetic Materials. — 2017. — Vol. 431. — P. 84-90.
Abstract: In this work, we briefly review magnetic separation of ferrofluids composed of large magnetic particles (60 nm of the average size) possessing an induced dipole moment. Such ferrofluids exhibit field-induced phase separation at relatively low particle concentrations (∼0.8 vol%) and magnetic fields (∼10 kA/m). Particle aggregates appearing during the phase separation are extracted from the suspending fluid by magnetic field gradients much easier than individual nanoparticles in the absence of phase separation. Nanoparticle capture by a single magnetized microbead and by multi-collector systems (packed bed of spheres and micro-pillar array) has been studied both experimentally and theoretically. Under flow and magnetic fields, the particle capture efficiency Λ decreases with an increasing Mason number for all considered geometries. This decrease may become stronger for aggregated magnetic particles (Λ∝Ma−1.7) than for individual ones (Λ∝Ma−1) if the shear fields are strong enough to provoke aggregate rupture. These results can be useful for development of new magneto-microfluidic immunoassays based on magnetic nanoparticles offering a much better sensitivity as compared to presently used magnetic microbeads. © 2016 Elsevier B.V.
Keywords: FERROFLUID
MAGNETIC COLLOIDS
MAGNETIC SEPARATION
PHASE SEPARATION
AGGREGATES
MAGNETIC FIELDS
MAGNETIC FLUIDS
MAGNETIC SEPARATION
MAGNETISM
MICROFLUIDICS
NANOMAGNETICS
NANOPARTICLES
PACKED BEDS
PHASE SEPARATION
INDIVIDUAL NANOPARTICLES
INDUCED DIPOLE MOMENTS
MAGNETIC COLLOIDS
MAGNETIC FIELD GRADIENT
MAGNETIC NANO-PARTICLES
MICRO-FLUIDIC DEVICES
MICROFLUIDIC IMMUNOASSAY
PARTICLE CONCENTRATIONS
MAGNETIC BUBBLES
URI: http://hdl.handle.net/10995/102189
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84994104425
PURE ID: 1691511
5b98a87d-f9cf-4aef-b187-90228517df3b
ISSN: 3048853
DOI: 10.1016/j.jmmm.2016.08.054
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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