  We explore the influence of particle shape on the behavior of evaporating
drops. A first set of experiments discovered that particle shape modifies
particle deposition after drying. For sessile drops, spheres are deposited in a
ring-like stain, while ellipsoids are deposited uniformly. Experiments
elucidate the kinetics of ellipsoids and spheres at the drop's edge. A second
set of experiments examined evaporating drops confined between glass plates. In
this case, colloidal particles coat the ribbon-like air-water interface,
forming colloidal monolayer membranes (CMMs). As particle anisotropy increases,
CMM bending rigidity was found to increase, which in turn introduces a new
mechanism that produces a uniform deposition of ellipsoids and a heterogeneous
deposition of spheres after drying. A final set of experiments investigates the
effect of surfactants in evaporating drops. The radially outward flow that
pushes particles to the drop's edge also pushes surfactants to the drop's edge,
which leads to a radially inward flow on the drop surface. The presence of
radially outward flows in the bulk fluid and radially inward flows at the drop
surface creates a Marangoni eddy, among other effects, which also modifies
deposition after drying.
