Water contact angles on charged surfaces in aerosols

doi:10.1088/1674-1056/ac5c2f

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 56801-056801.doi: 10.1088/1674-1056/ac5c2f

Water contact angles on charged surfaces in aerosols

Yu-Tian Shen(申钰田)^1,2, Ting Lin(林挺)², Zhen-Ze Yang(杨镇泽)², Yong-Feng Huang(黄永峰)^1,2, Ji-Yu Xu(徐纪玉)^1,2, and Sheng Meng(孟胜)^1,2,†

1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2021-12-02 修回日期:2022-02-28 出版日期:2022-05-14 发布日期:2022-04-29
通讯作者: Sheng Meng,E-mail:smeng@iphy.ac.cn E-mail:smeng@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.12025407,11934003,91850120,and 11774328),the Key R&D Program of China (Grant No.2016YFA0300902),and the Chinese Academy of Sciences.

Water contact angles on charged surfaces in aerosols

Yu-Tian Shen(申钰田)^1,2, Ting Lin(林挺)², Zhen-Ze Yang(杨镇泽)², Yong-Feng Huang(黄永峰)^1,2, Ji-Yu Xu(徐纪玉)^1,2, and Sheng Meng(孟胜)^1,2,†

1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-12-02 Revised:2022-02-28 Online:2022-05-14 Published:2022-04-29
Contact: Sheng Meng,E-mail:smeng@iphy.ac.cn E-mail:smeng@iphy.ac.cn
About author:2022-3-10
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.12025407,11934003,91850120,and 11774328),the Key R&D Program of China (Grant No.2016YFA0300902),and the Chinese Academy of Sciences.

摘要/Abstract

摘要： Interactions between water and solid substrates are of fundamental importance to various processes in nature and industry. Electric control is widely used to modify interfacial water, where the influence of surface charges is inevitable. Here we obtain positively and negatively charged surfaces using LiTaO₃ crystals and observe that a large net surface charge up to 0.1 C/m² can nominally change the contact angles of pure water droplets comparing to the same uncharged surface. However, even a small amount of surface charge can efficiently increase the water contact angle in the presence of aerosols. Our results indicate that such surface charges can hardly affect the structure of interfacial water molecular layers and the morphology of the macroscopic droplet, while adsorption of a small amount of organic contaminants from aerosols with the help of Coulomb attraction can notably decrease the wettability of solid surface. Our results not only provide a fundamental understanding of the interactions between charged surfaces and water, but also help to develop new techniques on electric control of wettability and microfluidics in real aerosol environments.

关键词: water contact angle, charged surface, aerosols

Abstract: Interactions between water and solid substrates are of fundamental importance to various processes in nature and industry. Electric control is widely used to modify interfacial water, where the influence of surface charges is inevitable. Here we obtain positively and negatively charged surfaces using LiTaO₃ crystals and observe that a large net surface charge up to 0.1 C/m² can nominally change the contact angles of pure water droplets comparing to the same uncharged surface. However, even a small amount of surface charge can efficiently increase the water contact angle in the presence of aerosols. Our results indicate that such surface charges can hardly affect the structure of interfacial water molecular layers and the morphology of the macroscopic droplet, while adsorption of a small amount of organic contaminants from aerosols with the help of Coulomb attraction can notably decrease the wettability of solid surface. Our results not only provide a fundamental understanding of the interactions between charged surfaces and water, but also help to develop new techniques on electric control of wettability and microfluidics in real aerosol environments.

Key words: water contact angle, charged surface, aerosols

中图分类号: (Wetting)

68.08.Bc

68.08.-p (Liquid-solid interfaces)

Yu-Tian Shen(申钰田), Ting Lin(林挺), Zhen-Ze Yang(杨镇泽), Yong-Feng Huang(黄永峰), Ji-Yu Xu(徐纪玉), and Sheng Meng(孟胜). Water contact angles on charged surfaces in aerosols[J]. 中国物理B, 2022, 31(5): 56801-056801.

Yu-Tian Shen(申钰田), Ting Lin(林挺), Zhen-Ze Yang(杨镇泽), Yong-Feng Huang(黄永峰), Ji-Yu Xu(徐纪玉), and Sheng Meng(孟胜). Water contact angles on charged surfaces in aerosols[J]. Chin. Phys. B, 2022, 31(5): 56801-056801.

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Water contact angles on charged surfaces in aerosols

Water contact angles on charged surfaces in aerosols

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