| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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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 |
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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.
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Received: 02 December 2021
Revised: 28 February 2022
Accepted manuscript online:
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PACS:
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68.08.Bc
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(Wetting)
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68.08.-p
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(Liquid-solid interfaces)
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| Fund: 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. |
Corresponding Authors:
Sheng Meng,E-mail:smeng@iphy.ac.cn
E-mail: smeng@iphy.ac.cn
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| About author: 2022-3-10 |
Cite this article:
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 2022 Chin. Phys. B 31 056801
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