National Center for Nanoscience and Technology , Beijing 100190, People's Republic of China.
Shanghai Institute of Optics and Fine Mechanics , Shanghai 201800, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Aug 30;9(34):29248-29254. doi: 10.1021/acsami.7b08116. Epub 2017 Aug 18.
Directional water collection has stimulated a great deal of interest because of its potential applications in the field of microfluidics, liquid transportation, fog harvesting, and so forth. There have been some bio or bioinspired structures for directional water collection, from one-dimensional spider silk to two-dimensional star-like patterns to three-dimensional Nepenthes alata. Here we present a simple way for the accurate design and highly controllable driving of tiny droplets: by laser direct writing of hierarchical patterns with modified wettability and desired geometry on a superhydrophobic film, the patterned film can precisely and directionally drive tiny water droplets and dramatically improve the efficiency of water collection with a factor of ∼36 compared with the original superhydrophobic film. Such a patterned film might be an ideal platform for water collection from humid air and for planar microfluidics without tunnels.
由于在微流控、液体输送、雾收集等领域的潜在应用，定向集水受到了极大的关注。已经有一些生物或仿生结构用于定向集水，从一维的蜘蛛丝到二维的星形图案到三维的猪笼草。在这里，我们提出了一种简单的方法，可以精确设计和高度控制微小液滴的运动：通过激光直写具有修改润湿性和所需几何形状的分层图案，在超疏水膜上，可以精确和定向地驱动微小水滴，并将集水效率提高约 36 倍，与原始超疏水膜相比。这种图案化薄膜可能是从潮湿空气中收集水的理想平台，也是没有隧道的平面微流控的理想平台。
