Thermocapillary valve for droplet production and sortingReport as inadecuate

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* Corresponding author 1 LadHyX - Laboratoire d-hydrodynamique 2 CPMOH - Centre de physique moléculaire optique et hertzienne 3 JAD - Laboratoire Jean Alexandre Dieudonné

Abstract : Droplets are natural candidates for use as microfluidic reactors, if active control of their formation and transport can be achieved. We show here that localized heating from a laser can block the motion of a water-oil interface, acting as a microfluidic valve for two-phase flows. A theoretical model is developed to explain the forces acting on a drop due to thermocapillary flow, predicting a scaling law that favors miniaturization. Finally, we show how the laser forcing can be applied to sorting drops, thus demonstrating how it may be integrated in complex droplet microfluidic systems.

Author: Charles Baroud - Jean-Pierre Delville - François Gallaire - Régis Wunenburger -



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