In contrast to passive Brownian motion its active counterpart has some sort of mechanism influencing the direction or speed of the particles. Examples of such particles range from synthetic janus swimmers which have a chemical propulsion in a certain direction to Bacteria which control their motion by transforming their body. With both passive kicks and active motion acting on the particles intriguing effects can be observed.
Soft Matter in Flow
The statistics of colloids change significantly when they enter a condensed phase. In a dense package one can observe numerous effects from anormal diffusion to phase transistions. We study the response to an external flow.