  Active drops refer to drops with the ability to self-migrate: these drops
typically attain this ability by virtue of containing of active particles that
derive energy from their environment and undergo directed motion inside the
drops, thereby creating intricate stress distribution within these drops. Here
we describe the evaporation dynamics of a slender active nematic drop. The
stresses induced by active nematic particles present within the drop enables
fascinating drop evaporation dynamics, consisting of an initial pinned stage
and a late runaway stage. Unlike regular drops, during the pinned stage (for
extensile drops) the drops encounter puncturing at their centers, followed by a
receding motion of the newly formed inner contact line with the liquid flux
pushing the (nematic) particles towards the inner and the outer contact lines:
the result is the formation of a unique ring-galaxy-like particle deposition
pattern. We identify three non-dimensional parameters, representing the
activity, the aspect ratio, and the receding contact angle, which dictate the
occurrence of puncturing, the overall evaporation time, and the possible
deposit patterns for the extensile drops and the contractile drops. Finally, we
argue that such unique evaporation and particle deposition dynamics can be
leveraged for altering lifetime of drops for cooling and bio-applications and
creating customized thin film deposits with potential 3D printing applications.
