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We report the generation of directed self-propelled motion of a droplet ofaniline oil with a velocity on the order of centimeters per second on anaqueous phase. It is found that, depending on the initial conditions, thedroplet shows either circular or beeline motion in a circular Petri dish. Themotion of a droplet depends on volume of the droplet and concentration ofsolution. The velocity decreases when volume of the droplet and concentrationof solution increase. Such unique motion is discussed in terms ofMarangoni-driven spreading under chemical nonequilibrium. The simulationreproduces the mode of motion in a circular Petri dish.

Self-Propelled Motion of a Droplet Induced by Marangoni-driven Spreading