4.8 Article

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

期刊

NANO RESEARCH
卷 15, 期 5, 页码 4732-4738

出版社

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4093-0

关键词

self-cleaning; electric field; low humidity; electro-aggregation; superhydrophobic nanostructured surface

资金

  1. National Natural Science Foundation of China [51837009, 51907168]

向作者/读者索取更多资源

This study proposes a method to achieve self-cleaning at low humidity. By electro-aggregating and electric field driving, pollutants are aggregated and cleaned on a large scale. The cleaning efficiency of this method is higher than water droplet roll-off and does not produce pollution bands. Simulation results match experimental results, and this method realizes the self-cleaning of superhydrophobic nanostructured surfaces in low humidity for the first time.
Self-cleaning is the key factor that makes superhydrophobic nanostructured materials have wide applications. The self-cleaning effect, however, strongly depends on formations and movement of water droplets on superhydrophobic nanostructured surfaces, which is greatly restricted at low humidity (< 7.6 g center dot kg(-1)). Therefore, we propose a self-cleaning method at low humidity in which the pollution is electro-aggregated and driven in the electric field to achieve the aggregation and cleaning large areas. The cleaning efficiency of this method is much higher than that of water droplet roll-off, and will not produce pollution bands. A simplified numerical model describing pollution movements is presented. Simulation results are consistent with experimental results. The proposed method realizes the self-cleaning of superhydrophobic nanostructured surfaces above dew point curve for the first time, which extends applications of superhydrophobic nanostructured materials in low humidity, and is expected to solve self-cleaning problems of outdoor objects in low humidity areas (< 5.0 g center dot kg(-1)).

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