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Photomanipulation of a Droplet by the Chromocapillary Effect


  • We thank Profs. L. Jullien and K. Agladze for valuable discussions. This work was partially supported by the ICORP 2006 “Spatio-Temporal Order” project (Japan Science and Technology Agency), the Centre National de la Recherche Scientifique (CNRS), and the Agence Nationale pour la Recherche (ANR-07-blan-0340).


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Ace of hearts: Liquid droplets can be manipulated in a controlled fashion along trajectories of any desired shape (such as a heart, see picture) by using light to create a wavelength-dependent interfacial tension gradient at a liquid/liquid interface. In this new phenomenon, the “chromocapillary effect”, an interfacial flow generates droplet motion in the direction opposite to the gradient.

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