Light-driven boats using asymmetrical convection flow

Self-propelled microrobots have been attracting much attention. In this study, we report that a light-driven boat using asymmetrical convection flow moves toward the colder end. Specifically, we demonstrated that a floating circular structure consisting of a light-reflecting semi-circular part and a light-absorbing semi-circular part moves toward the end of the light-reflecting part under light irradiation. In addition, by visualizing the flow field under the boat, we confirmed that the boat generated a convection flow toward the cold side and was moving to ride on the flow. Our device is useful for biomedical applications and water remediation. Published under an exclusive license by AIP Publishing.