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Issue 22, 2014
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Tunable interactions between paramagnetic colloidal particles driven in a modulated ratchet potential

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Abstract

We study experimentally and theoretically the interactions between paramagnetic particles dispersed in water and driven above the surface of a stripe patterned magnetic garnet film. An external rotating magnetic field modulates the stray field of the garnet film and generates a translating potential landscape which induces directed particle motion. By varying the ellipticity of the rotating field, we tune the inter-particle interactions from net repulsive to net attractive. For attractive interactions, we show that pairs of particles can approach each other and form stable doublets which afterwards travel along the modulated landscape at a constant mean speed. We measure the strength of the attractive force between the moving particles and propose an analytically tractable model that explains the observations and is in quantitative agreement with experiment.

Graphical abstract: Tunable interactions between paramagnetic colloidal particles driven in a modulated ratchet potential

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Publication details

The article was received on 17 Jan 2014, accepted on 14 Feb 2014 and first published on 14 Feb 2014


Article type: Paper
DOI: 10.1039/C4SM00132J
Citation: Soft Matter, 2014,10, 3915-3925
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    Tunable interactions between paramagnetic colloidal particles driven in a modulated ratchet potential

    A. V. Straube and P. Tierno, Soft Matter, 2014, 10, 3915
    DOI: 10.1039/C4SM00132J

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