We demonstrate the phototactic behavior of self-propelled micrometer-sized oil droplets in the presence of azobenzene-containing surfactants. These droplets respond sensitively to UV light irradiation due to a variation in the interfacial tension at the droplet surface induced by the molecular conversion of the azobenzene-containing surfactants.
S. Kaneko, K. Asakura and T. Banno, Chem. Commun., 2017, 53, 2237 DOI: 10.1039/C6CC09236E
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