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Active drops refer to drops with the ability to self-migrate: these dropstypically attain this ability by virtue of containing of active particles thatderive energy from their environment and undergo directed motion inside thedrops, thereby creating intricate stress distribution within these drops. Herewe describe the evaporation dynamics of a slender active nematic drop. Thestresses induced by active nematic particles present within the drop enablesfascinating drop evaporation dynamics, consisting of an initial pinned stageand a late runaway stage. Unlike regular drops, during the pinned stage (forextensile drops) the drops encounter puncturing at their centers, followed by areceding motion of the newly formed inner contact line with the liquid fluxpushing the (nematic) particles towards the inner and the outer contact lines:the result is the formation of a unique ring-galaxy-like particle depositionpattern. We identify three non-dimensional parameters, representing theactivity, the aspect ratio, and the receding contact angle, which dictate theoccurrence of puncturing, the overall evaporation time, and the possibledeposit patterns for the extensile drops and the contractile drops. Finally, weargue that such unique evaporation and particle deposition dynamics can beleveraged for altering lifetime of drops for cooling and bio-applications andcreating customized thin film deposits with potential 3D printing applications.

Evaporation of Active Drops: Dynamics of Punctured Drops and Particle Deposits of Ring Galaxy Patterns