Combining a stimulus-responsive material and the Marangoni effect, a smart microactuator consisting of UV-responsive photoresist and surfactant was fabricated. The locomotion of a device loaded with the microactuator was initiated upon irradiation with 365-nm UV light, stopped when the light was turned off, and restarted when the light was turned back on. This work is the first example using the chemical Marangoni effect to produce photoresponsive motion on a water surface.
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