MMN, UMR CNRS Gulliver 7083, PSL Research University, ESPCI ParisTech, 10 rue Vauquelin, Paris 75005, France.
Lab Chip. 2015 May 7;15(9):2133-9. doi: 10.1039/c5lc00110b.
We report on a versatile technique for microfluidic droplet manipulation that proves effective at every step: from droplet generation to propulsion to sorting, rearrangement or break-up. Non-wetting droplets are thermomechanically actuated in a microfluidic chip using local heating resistors. Controlled temperature variation induces local dilation of the PDMS wall above the resistor, which drives the droplet away from the hot (i.e. constricted) region (B. Selva, I. Cantat and M.-C. Jullien, Phys. Fluids, 2011, 23, 052002). Adapted placing and actuation of such resistors thus allow us to push forward, stop, store and release, or even break up droplets, at the price of low electric power consumption (<150 mW). We believe this technically accessible method to provide a useful tool for droplet microfluidics.
我们报告了一种多功能的微流控液滴操控技术，该技术在从液滴生成到推进、到分类、重新排列或分裂的每一个步骤都非常有效。使用局部加热电阻器，在微流控芯片中对非润湿液滴进行热机械驱动。通过控制温度变化，在电阻器上方的 PDMS 壁产生局部膨胀，从而将液滴从热（即收缩）区域驱离（B. Selva、I. Cantat 和 M.-C. Jullien，Phys. Fluids，2011，23，052002）。通过适当放置和驱动这种电阻器，我们可以推动、停止、存储和释放液滴，甚至可以将液滴分裂，而功耗却很低（<150 mW）。我们相信，这种技术上易于实现的方法为液滴微流控提供了一种有用的工具。
