Emergent Phenomena in Far-From-Equilibrium Magnetic Granular Ensembles at a Liquid-Air Interface
Abstract
Remarkable nontrivially ordered self-assembled structures are formed in ensembles of magnetic microparticles suspended at a liquid/air interface and energized by an alternating magnetic field. These dynamic structures emerge as a result of a competition between magnetic and hydrodynamic forces. Each structure (snake) is accompanied by a hydrodynamic vortex quadrupole. Under certain conditions snakes spontaneously break the symmetry of surface flows and turn into swimmers. Observed phenomena have been successfully described by a phenomenological model.
- Publication:
-
Powders and Grains 2009
- Pub Date:
- June 2009
- DOI:
- 10.1063/1.3179849
- Bibcode:
- 2009AIPC.1145..143S
- Keywords:
-
- 81.20.Ev;
- 47.57.Gc;
- 41.20.Cv;
- 87.19.ru;
- Powder processing: powder metallurgy compaction sintering mechanical alloying and granulation;
- Granular flow;
- Electrostatics;
- Poisson and Laplace equations boundary-value problems;
- Locomotion