期刊
ADVANCED MATERIALS INTERFACES
卷 7, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/admi.201902150
关键词
anisotropic wettability; capillary action; fog harvesting; nanoimprinting lithography
资金
- UC Irvine Mechanical and Aerospace Engineering Department Graduate Fellowship
- Water-Energy Nexus Center
- Soongsil University
The design of water collectors that capture atmospheric fogs has been challenging due to the reliability issue. In particular, the small openings of collecting surfaces are often clogged by large-size droplets. The additional hydraulic resistances added to the collecting surfaces prevent the fog pathways and further lower the overall performance coefficients by decreasing the shade coefficient of the collectors. The clogging issues can be addressed by modulating the fog harvesters' surface chemistry and surface structures to deliver water droplets efficiently and to prevent re-entrainment of droplets to the openings. Herein, the novel design of fog collectors that consist of both nanochannels and macrostripes is demonstrated. The combination of those two structures provides the anisotropic wettability and thereby directional spreading in the longitudinal direction to the nanochannels. The directional liquid spreading facilitates continuous liquid transport through the formation of a thin liquid film. As a result, the fog collector successfully enhances the fog harvesting performance by 50% compared to conventional mesh-like fog collectors.
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