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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2007

Thermocapillary valve for droplet production and sorting

Résumé

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.
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Dates et versions

hal-00144332 , version 1 (02-05-2007)

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Charles N. Baroud, Jean-Pierre Delville, François Gallaire, Régis Wunenburger. Thermocapillary valve for droplet production and sorting. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2007, 75 (4), pp.046302(5). ⟨10.1103/PhysRevE.75.046302⟩. ⟨hal-00144332⟩
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