Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 444, Issue -, Pages 467-471Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.08.057
Keywords
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Funding
- Universidad Nacional de General Sarmiento
- CONICET [PIO CONICET UNGS-144-20140100016-CO, PIP 536]
- ANPCyT [PICT2013-160]
- Universidad de Buenos Aires [UBAcyt 661]
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We study the propulsion of superparamagnetic particles dispersed in a viscous fluid upon the application of an elliptically polarized rotating magnetic field. Reducing the fluid surface tension the particles sediment due to density mismatch and rotate close to the low recipient confining plate. We study the net translational motion arising from the hydrodynamic coupling with the plate and find that, above a cross over magnetic field, magnetically assembled doublets move faster than single particles. In turn, particles are driven in complex highly controlled trajectories by rotating the plane containing the magnetic field vector. The effect of the field rotation on long self assembled chains is discussed and the alternating breakup and reformation of the particle chains is described. (C) 2017 Elsevier B.V. All rights reserved.
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