Abstract

Recently, photo-driven directional motion of glycerol droplets on the surface of a liquidcrystal doped with photochromic azobenzene derivatives has been reported. We present atheoretical model for this phenomenon. The motion of droplets is induced by a gradient insurface tension, which is produced by the combined effect of photo-isomerization anddiffusion of surface azobenzenes. The theoretical relation between the surface tensionand the surface concentration of cis isomers is proposed. The experimentallyobserved depletion zone of droplets can be reasonably well explained in termsof diffusion of droplets in the presence of the gradient in the surface tension.

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