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Kinetics of doublet formation in bicomponent magnetic suspensions: The role of the magnetic permeability anisotropy

Lopez-Lopez, MT; Nogueras-Lara, F; Rodriguez-Arco, L; Guigo, N; Sbirrazzuoli, N; Zubarev, AY; Lacis, S; (2017) Kinetics of doublet formation in bicomponent magnetic suspensions: The role of the magnetic permeability anisotropy. Physical Review E , 96 (6) , Article 062604. 10.1103/PhysRevE.96.062604. Green open access

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Abstract

Micron-sized particles (microbeads) dispersed in a suspension of magnetic nanoparticles, i.e., ferrofluids, can be assembled into different types of structures upon application of an external magnetic field. This paper is devoted to theoretical modeling of a relative motion of a pair of microbeads (either soft ferromagnetic or diamagnetic) in the ferrofluid under the action of applied uniform magnetic field which induces magnetic moments in the microbeads making them attracting to each other. The model is based on a point-dipole approximation for the magnetic interactions between microbeads mediated by the ferrofluid; however, the ferrofluid is considered to possess an anisotropic magnetic permeability thanks to field-induced structuring of its nanoparticles. The model is tested against experimental results and shows generally better agreement with experiments than the model considering isotropic magnetic permeability of ferrofluids. The results could be useful for understanding kinetics of aggregation of microbeads suspended in a ferrofluid. From a broader perspective, the present study is believed to contribute to a general understanding of particle behaviors in anisotropic media.

Type: Article
Title: Kinetics of doublet formation in bicomponent magnetic suspensions: The role of the magnetic permeability anisotropy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevE.96.062604
Publisher version: https://doi.org/10.1103/PhysRevE.96.062604
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Interparticle interactions, Ferrofluids, Condensed Matter & Materials Physics, Fluid Dynamics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10049250
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