Ferrofluids investigated along for about five decades are ultrastable colloidal suspensions of
magnetic nanoparticles, which manifest simultaneously fluid and magnetic properties. Their …

Microrotors are microscopic objects that convert energy stored in the environment into
spontaneous rotation, in the form of spinning along an axis, rolling on a surface, or orbiting …

Chiral active matter comprises particles which can self-propel and self-rotate. Examples
range from sperm cells and bacteria near walls to autophoretic L-shaped colloids. In this …

There is currently a strong interest in the collective behavior of chiral active particles that can
propel and rotate themselves. In the presence of alignment interactions for many chiral …

At the microscale, coupled physical interactions between collectives of agents can be
exploited to enable self-organization. Past systems typically consist of identical agents; …

Broken time-reversal and parity symmetries in active spinner fluids imply a nondissipative
“odd viscosity,” engendering phenomena unattainable in traditional passive or active fluids …

A first-principles approach for active chiral hard disks is presented, that explicitly accounts
for steric interactions on the two-body level. We derive an effective one-body equation for the …

Odd viscosity is a property of chiral active fluids with broken time-reversal and parity
symmetries. We show that the flow of such a fluid around a rotating axisymmetric body is …

Vortical flows of rotating particles describe interactions ranging from molecular machines to
atmospheric dynamics. Yet to date, direct observation of the hydrodynamic coupling …

Magnetorheological fluids structured under precession fields are thoroughly investigated.
Having complete dynamic triaxial magnetic field control, we are able to study both the …