  We study the influence of particle shape on growth processes at the edges of
evaporating drops. Aqueous suspensions of colloidal particles evaporate on
glass slides, and convective flows during evaporation carry particles from drop
center to drop edge, where they accumulate. The resulting particle deposits
grow inhomogeneously from the edge in two-dimensions, and the deposition front,
or growth line, varies spatio-temporally. Measurements of the fluctuations of
the deposition front during evaporation enable us to identify distinct growth
processes that depend strongly on particle shape. Sphere deposition exhibits a
classic Poisson like growth process; deposition of slightly anisotropic
particles, however, belongs to the Kardar-Parisi-Zhang (KPZ) universality
class, and deposition of highly anisotropic ellipsoids appears to belong to a
third universality class, characterized by KPZ fluctuations in the presence of
quenched disorder.
