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http://elar.urfu.ru/handle/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://elar.urfu.ru/handle/10995/102189 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 84994104425 |
WOS ID: | 000399598600022 |
PURE ID: | 5b98a87d-f9cf-4aef-b187-90228517df3b 1691511 |
ISSN: | 3048853 |
DOI: | 10.1016/j.jmmm.2016.08.054 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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