Dynamics of cluster formation in driven dipolar colloids dispersed on a   monolayer
  We report computer simulation results on the cluster formation of dipolar colloidal particles driven by a rotating external field in a quasi-two-dimensional setup. We focus on the interplay between permanent dipolar and hydrodynamic interactions and its influence on the dynamic behavior of the particles. This includes their individual as well as their collective motion. To investigate these characteristics, we employ Brownian dynamics simulations of a finite system with and without hydrodynamic interactions. Our results indicate that particularly the translation-rotation coupling from the hydrodynamic interactions has a profound impact on the clustering behavior. 
Sebastian J\"ager, Holger Stark, and Sabine H. L. Klapp
cond-mat.soft