Light-driven motion of liquids on a photoresponsive surface

  title={Light-driven motion of liquids on a photoresponsive surface},
  author={Ichimura and Oh and Nakagawa},
  volume={288 5471},
The macroscopic motion of liquids on a flat solid surface was manipulated reversibly by photoirradiation of a photoisomerizable monolayer covering the surface. When a liquid droplet several millimeters in diameter was placed on a substrate surface modified with a calix[4]resorcinarene derivative having photochromic azobenzene units, asymmetrical photoirradiation caused a gradient in surface free energy due to the photoisomerization of surface azobenzenes, leading to the directional motion of… 

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