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Issue 46, 2016
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Non reciprocal skewed rolling of a colloidal wheel due to induced chirality

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Abstract

We use a rotating magnetic field to assemble an oblate cluster of paramagnetic colloidal particles. If the field is rotating about a horizontal axis, the cluster acts as a colloidal wheel rolling across the supporting glass surface. The motion is reversible upon switching the direction of rotation. Surprisingly, the reversibility is lost if the axis of field rotation is tilted with respect to the surface. The wheel then rolls in a direction that is not perpendicular to the field rotation axis. We explain the skewed rotation with an interplay between a magnetic driving torque, magnetic anisotropy and an anisotropy in the hydrodynamic mobility tensor in the vicinity of a surface. The opposing forward and backward drive induce opposite chirality in the degrees of freedom of the mechanically achiral colloidal wheel.

Graphical abstract: Non reciprocal skewed rolling of a colloidal wheel due to induced chirality

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Publication details

The article was received on 20 Sep 2016, accepted on 15 Oct 2016, published on 17 Oct 2016 and first published online on 17 Oct 2016


Article type: Paper
DOI: 10.1039/C6SM02143C
Citation: Soft Matter, 2016,12, 9314-9320
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    Non reciprocal skewed rolling of a colloidal wheel due to induced chirality

    F. J. Maier, T. Lachner, A. Vilfan, T. O. Tasci, K. B. Neeves, D. W. M. Marr and T. M. Fischer, Soft Matter, 2016, 12, 9314
    DOI: 10.1039/C6SM02143C

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