Abstract
We present experiments on pattern formation in a Brownian system of oppositely charged colloids
driven by an ac electric field. Using confocal laser scanning microscopy we observe complete segregation
of the two particle species into bands perpendicular to a field of sufficient strength when the frequency is
in a well-defined range. Because of its Brownian nature the system spontaneously returns to the
equilibrium mixture after the field is turned off. We show that band formation is linked to the time scale
associated with collisions between particles moving in opposite directions.
| Original language | English |
|---|---|
| Article number | 228303 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 106 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 2011 |