用于液滴产生和分选的热毛细管阀
Thermocapillary valve for droplet production and sorting
摘要：
如果可以实现对液滴的形成和运输的主动控制，则液滴是用作微流体反应器的天然候选物。我们在这里表明，激光局部加热可以阻止水-油界面的运动，作为两相流的微流体阀。一个理论模型来解释由于热毛细流动作用在液滴上的力，预测一个有利于小型化的标度律。最后，我们展示了如何将激光强制应用于分选液滴，从而展示了它如何集成在复杂的液滴微流体系统中。
英文摘要：
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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