An Efficient Fog Collector Achieved by Optimal Hierarchical Surface Patterns and Wetting Gradient

With the decrease in fresh water resources, fog collection has become a promising way to obtain fresh water. This paper presents an efficient fog collector that combines wettability and spokes geometry. Water droplets move along a fixed route on the mist collector and can easily overcome the pinning effect at the end of the structure to detach from the surface and then be collected. Its fog collecting efficiency can be 1.82 times that of a planar zinc sheet, which provides a new idea for the design of subsequent fog collectors. In this communication, based on the lack of fresh water resources, the method of combining geometric structure with wettability to prepare a fog collector is proposed. And the high efficiency of fog collection is realized, which provides a new idea for the design of fog collector.