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

作　　者：Yijie Liu Yujun Guo Xueqin Zhang Guoqiang Gao Chaoqun Shi Guizao Huang Pengli Li Qi Kang Xingyi Huang Guangning Wu 

机构地区：[1]College of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China [2]Department of Polymer Science and Engineering,Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing,State Key laboratory of Metal Matrix Composites,Shanghai Jiaotong University,Shanghai 200240,China

出　　处：《Nano Research》2022年第5期4732-4738,共7页纳米研究（英文版）

基　　金：The authors are grateful to the supporting program of the National Natural Science Foundation of China(Nos.51837009 and 51907168).

摘　　要：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·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·kg^(-1)).

关 键 词：SELF-CLEANING electric field low humidity electro-aggregation superhydrophobic nanostructured surface 

分 类 号：TB383[一般工业技术—材料科学与工程]