Dynamic self-assembly and patterns in electrostatically driven granular   media
  We show that granular media consisting of metallic microparticles immersed in a poorly conducting liquid in strong DC electric field self-assemble a rich variety of novel phases. These phases include static precipitate: honeycombs and Wigner crystals; and novel dynamic condensate: toroidal vortices and pulsating rings. The observed structures are explained by the interplay between charged granular gas and electrohydrodynamic convective flows in the liquid. 
M. V. Sapozhnikov, Y. V. Tolmachev, I. S. Aranson and W.-K. Kwok