Issue 29, 2013

Emergent coherent states and flow rectification in active magnetic colloidal monolayers

Abstract

We report on an emergent coherent behavior of a ferromagnetic colloidal monolayer suspended at a liquid–air interface and powered by a single-axis alternating in-plane magnetic field. Large-scale coherent states are manifested by formation of dynamic vortex arrays within the colloidal monolayer. Emergence of the dynamic coherence and self-organized patterns in this non-equilibrium colloidal system is attributed to a spontaneous symmetry breaking due to subtle interplay between magnetic, steric, and hydrodynamic forces acting on individual colloidal particles. Collective response of the magnetic colloidal monolayer induces in-plane rectified hydrodynamic surface flows which in turn entrains the particles, resulting in a variety of coherent states.

Graphical abstract: Emergent coherent states and flow rectification in active magnetic colloidal monolayers

Supplementary files

Article information

Article type
Communication
Submitted
12 Jan 2013
Accepted
01 Mar 2013
First published
12 Mar 2013

Soft Matter, 2013,9, 6757-6760

Emergent coherent states and flow rectification in active magnetic colloidal monolayers

G. Kokot, A. Snezhko and I. S. Aranson, Soft Matter, 2013, 9, 6757 DOI: 10.1039/C3SM00136A

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