微液滴的非机械驱动

微液滴的非机械驱动是操纵微小尺雨液体流动的新方法。本文介绍当前有关微液滴非机械驱动的研究进展，包括：利用电化学方法产生并消耗表面活性分子来产生表面张力梯度；把表面浸润性梯度和温度梯度相结合；通过光敏化合物偶氮部分顺反异构的转换导致表面自由能的变化，最后由光照来驱动微液滴，以及利用固体基片上的亲水疏水条纹构建微芯片上实验室的液体非机械输送网络。

Non mechanical Driving of Micro drop Liquids

Using non mechanical means to pump and position liquid micro drops is a novel way to control fluids in sub millimeter scale.In this paper,the recent developments of technologies in non mechanical liquid controlling and driving are reviewed.They are liquid motion driven by surface tension gradient through the electrochemical generation and depletion of surface active molecules,by surface free energy gradient through the %trans cis% transition of the azobenzene group of a photoresponsive surface,by the combination of temperature gradient and sufrace wettability gradient,and by using hydrophilic and hydrophobic strips on solid substrates to construct non mechanical liquid transport net of microchips.