One characteristic feature of soft matter systems is their strong response to external stimuli.
As a consequence they are comparatively easily driven out of their ground state and out of …

Conspectus The ability to navigate in chemical gradients, called chemotaxis, is crucial for
the survival of microorganisms. It allows them to find food and to escape from toxins. Many …

Active colloids are microscopic particles, which self-propel through viscous fluids by
converting energy extracted from their environment into directed motion. We first explain …

We study the collective motion of confined spherical microswimmers such as active colloids
which we model by so-called squirmers. To simulate hydrodynamic flow fields including …

The past two decades have seen a remarkable progress in the development of synthetic
colloidal agents which are capable of creating directed motion in an unbiased environment …

Algae are ubiquitous in the marine environment, and the ways in which they interact with
bacteria are of particular interest in the field of marine ecology. The interactions between …

We analyze the collective dynamics of self-propelled particles in the large-density regime
where passive particles undergo a kinetic arrest to an amorphous glassy state. We capture …

A common feature of biological self-organization is how active agents communicate with
each other or their environment via chemical signaling. Such communications, mediated by …

After colliding with a surface, microswimmers reside there during the detention time. They
accumulate and may form complex structures such as biofilms. We introduce a general …

We study theoretically an active colloid whose polar axis of self-propulsion rotates to point
parallel (antiparallel) to an imposed chemical gradient. We show that the coupling of this …