Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/51182
Title: Haloing in bimodal magnetic colloids: The role of field-induced phase separation
Authors: Magnet, C.
Kuzhir, P.
Bossis, G.
Meunier, A.
Suloeva, L.
Zubarev, A.
Issue Date: 2012
Citation: Haloing in bimodal magnetic colloids: The role of field-induced phase separation / C. Magnet, P. Kuzhir, G. Bossis, A. Meunier, L. Suloeva, A. Zubarev // Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. — 2012. — Vol. 86. — № 1.
Abstract: If a suspension of magnetic micrometer-sized and nanosized particles is subjected to a homogeneous magnetic field, the nanoparticles are attracted to the microparticles and form thick anisotropic halos (clouds) around them. Such clouds can hinder the approach of microparticles and result in effective repulsion between them. In this paper, we present detailed experimental and theoretical studies of nanoparticle concentration profiles and of the equilibrium shapes of nanoparticle clouds around a single magnetized microsphere, taking into account interactions between nanoparticles. We show that at a strong enough magnetic field, the ensemble of nanoparticles experiences a gas-liquid phase transition such that a dense liquid phase is condensed around the magnetic poles of a microsphere while a dilute gas phase occupies the rest of the suspension volume. Nanoparticle accumulation around a microsphere is governed by two dimensionless parameters-the initial nanoparticle concentration (φ 0) and the magnetic-to-thermal energy ratio (α)-and the three accumulation regimes are mapped onto a α-φ 0 phase diagram. Our local thermodynamic equilibrium approach gives a semiquantitative agreement with the experiments on the equilibrium shapes of nanoparticle clouds. The results of this work could be useful for the development of the bimodal magnetorheological fluids and of the magnetic separation technologies used in bioanalysis and water purification systems. © 2012 American Physical Society.
URI: http://hdl.handle.net/10995/51182
https://elar.urfu.ru/handle/10995/51182
SCOPUS ID: 84863963261
WOS ID: 000306414700003
PURE ID: 1078709
ISSN: 1539-3755
1550-2376
DOI: 10.1103/PhysRevE.86.011404
CORDIS project card: 260073
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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