期刊
SOFT MATTER
卷 9, 期 29, 页码 6757-6760出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3sm00136a
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- U.S. DOE, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE AC02-06CH11357]
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.
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