Thermocapillary valve for droplet production and sorting

Details Thermocapillary valve for droplet production and sorting Thermocapillary valve for droplet production and sorting

2006-11-17

arxiv.org/abs/physics/0611170v1

Physics

Fluid Dynamics

Five pages, four figures

Scientific paper

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 which 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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