Moving droplets on asymmetrically structured surfaces | Zendy

Olivier Sandre | Zendy; Laurence Talini | Zendy; Armand Ajdari | Zendy; J. Prost | Zendy; Pascal Silberzan | Zendy

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Moving droplets on asymmetrically structured surfaces

Author(s) -

Olivier Sandre,

Laurence Talini,

Armand Ajdari,

J. Prost,

Pascal Silberzan

Publication year - 1999

Publication title -

physical review. e, statistical physics, plasmas, fluids, and related interdisciplinary topics

Language(s) - English

Resource type - Journals

eISSN - 1095-3787

pISSN - 1063-651X

DOI - 10.1103/physreve.60.2964

Subject(s) - drop (telecommunication) , liquid drop , electric field , mechanics , miniaturization , contact angle , drop impact , materials science , nanotechnology , physics , classical mechanics , mechanical engineering , engineering , wetting , thermodynamics , quantum mechanics

It is shown theoretically and experimentally that a liquid droplet can move on a surface structured with a locally asymmetric pattern when a breathing of the drop is induced by external means. Two different situations can be envisioned: a drop whose volume is modulated and a drop whose equilibrium contact angle is switched between two extreme values. This last case was experimentally investigated using electric fields acting on water droplets in castor oil. The main trends of the theory are verified although a quantitative analysis would necessitate either a simpler experimental geometry or a more elaborate model. The results are discussed with a miniaturization of the setup in mind which would have important potential applications in the field of integrated analysis systems.

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