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Dynamic self-assembly and patterns in electrostatically driven granular media.

M V Sapozhnikov1, Y V Tolmachev, I S Aranson

  • 1Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.

Physical Review Letters
|April 12, 2003
PubMed
Summary
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Metallic microparticles in a liquid self-assemble into novel phases like honeycombs and vortices under an electric field. These structures arise from interactions between charged particles and fluid flow.

Area of Science:

  • Soft Matter Physics
  • Complex Fluids
  • Electrohydrodynamics

Background:

  • Granular media exhibit complex behaviors when subjected to external fields.
  • Understanding self-assembly in multiphase systems is crucial for materials science.

Purpose of the Study:

  • To investigate the self-assembly of metallic microparticles in a poorly conducting liquid under a strong DC electric field.
  • To identify and characterize novel phases formed by these granular media.

Main Methods:

  • Experimental observation of microparticle behavior in an electric field.
  • Analysis of static and dynamic structures formed by the granular media.

Main Results:

  • Observed self-assembly into diverse novel phases, including static precipitates (honeycombs, Wigner crystals) and dynamic condensates (toroidal vortices, pulsating rings).

Related Experiment Videos

  • These structures result from the interplay between the charged granular gas and electrohydrodynamic convective flows.

    • Conclusions:

    • The study reveals a rich variety of self-assembled phases in electrically driven granular media.
    • Electrohydrodynamics and charged granular gas interactions are key mechanisms governing these complex structures.