科研之友
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摘要
Precisely manipulating small amounts of liquids has been widely applied in industry, ranging from biomedical devices to liquid transfer. Currently, direct light-driven manipulation of liquids, especially those triggered by light-induced capillary forces has drawn an increasing attention, because it requires neither special optical set-up nor complex microfabrication steps. However, the capillary force arising from wettability gradient is too small to overcome the effect of contact line pinning, and the motion is thus limited to specific liquids with a relatively short distance, simple linear trajectories, and low speed, Here, Yu et al. at Fudan University reported a new strategy to precisely manipulate liquids by photo-induced asymmetric deformation of tubular microactuators, which is a novel principle to induce capillary forces. These microactuators exhibit the unique capabilities to propel a wide diversity of liquids over a long distance with desirable velocity and controllable direction. Application in areas such as micro-opto-mechanical systems and optofluidics is highly anticipated.
- 出版日期2016-10-20
- 单位清华大学
