We study the motion of active Janus colloids in an optical trap using experiments, theory and
numerical simulations. To achieve isotropic and harmonic confinement, we prototype …

Using simulations and experiments, we demonstrate that the effective interaction between
passive particles in an active bath substantially depends on an external constraint suffered …

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 …

Typically, patchy systems are characterized by the formation of a small number of
directional, possibly selective, bonds due to the presence of attractive regions on the surface …

We describe a facile and flexible approach for synthesizing uniform non-spherical micron
sized PMMA (poly (methyl methacrylate)) colloids with well-controlled protrusions. When …

Optical tweezers are highly versatile laser traps for neutral microparticles, with fundamental
applications in physics and in single molecule cell biology. Force measurements are …

The aggregation behavior of particles in nonpolar media is studied with time-resolved light
scattering. At low surfactant concentrations particles are weakly charged and suspensions …

At low ionic strength the interaction between any two charged colloids in a concentrated
charge-stabilized suspension is strongly influenced by the charge distributions of other …

Colloidal dispersions composed of polymethylmetacrylate particles dispersed in a mixture of
cyclohexyl bromide and decalin find widespread use as model systems in optical …

Stress relaxation in crystalline solids is mediated by the formation and diffusion of defects.
Although it is well established how externally generated stresses relax, through the …