Capillary-induced movements
Manipulation of droplets using the chromocapillary effect: innovative example of the conversion of light energy into mechanical work
Research and innovation REF: IN123 V1
Capillary-induced movements
Manipulation of droplets using the chromocapillary effect: innovative example of the conversion of light energy into mechanical work

Authors : Antoine DIGUET, Arnaud SAINT-JALMES, Damien BAIGL

Publication date: January 10, 2011 | Lire en français

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3. Capillary-induced movements

3.1 Tension gradients and the Marangoni effect

So far, we've reasoned statically, assuming that the different voltages are uniform along the same interface (and therefore that q is the same along the triple line). However, it is quite possible to modify them in one part of the system. The dynamic phenomena that take place during the return to a state of equilibrium can be set in motion.

A simple example is the soap boat, in which a centimeter-sized object floating on water is moved by depositing a few drops of soap on one of its sides. As the surfactants are not evenly distributed over the surface of the bath, the float is subjected to a difference in surface tension. Surfactants diffuse towards areas of lower interfacial...

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