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APS » Journals » Phys. Rev. Lett. » Volume 90 » Issue 11
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Phys. Rev. Lett. 90, 114301 (2003) [4 pages]

Dynamic Self-Assembly and Patterns in Electrostatically Driven Granular Media

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M. V. Sapozhnikov1,2, Y. V. Tolmachev1, I. S. Aranson1, and W.-K. Kwok1
1Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
2Institute for Physics of Microstructures, Russian Academy of Sciences, GSP-105, Nizhny Novgorod 603000, Russia

Received 14 October 2002; revised 30 January 2003; published 19 March 2003

We show that granular media, consisting of metallic microparticles immersed in a poorly conducting liquid in a strong dc electric field, self-assemble into a rich variety of novel phases. These phases include static precipitates: honeycombs and Wigner crystals; and novel dynamic condensates: toroidal vortices and pulsating rings. The observed structures are explained by the interplay between charged granular gas and electrohydrodynamic convective flows in the liquid.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.114301
DOI:
10.1103/PhysRevLett.90.114301
PACS:
45.70.Qj, 05.65.+b, 47.15.Cb, 47.55.Kf
 
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