Dynamics of colloidal particles sticking to an oil-water interface

We observe micron sized colloids as they adsorb to an oil-water interface.~ We make a flat oil-water interface and can use an optical trap to bring particles from either phase to the interface.~ Using digital holographic microscopy, colloids are tracked as they encounter and stick to the interface.~ We observe particles slowly adsorbing to the interface over the course of seconds.~ We also observe the dynamics of stuck particles and track their out-of-plane motion.