文献类型：期刊文献

英文题名：Enhanced contact angle hysteresis of salt aqueous solution on graphite surface by a tiny amount of cation

作者：Yang, Haijun[1,3]; Wang, Yangjie[3,6]; Huang, Yingying[1]; Wang, Shuai[3,4]; Lü, Qiufeng[5]; Lei, Xiaoling[1,2]; Fang, Haiping[1,2,3]

机构：[1] Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, [SSRF, ZJLab], Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China; [2] Department of Physics, East China University of Science and Technology, Shanghai, 200237, China; [3] Division of Interfacial Water, CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China; [4] School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China; [5] College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350116, China; [6] University of Chinese Academy of Sciences, Beijing, 100049, China

年份：2020

外文期刊名：arXiv

收录：EI(收录号：20200470478)

语种：英文

外文关键词：Carbon nanotubes - Contact angle - Graphite - Hysteresis - Liquefied gases - Lithium compounds - Magnesium compounds - Molecular dynamics - Phase interfaces - Potassium compounds - Sodium chloride

摘要：We experimentally observed the enhanced contact angle hysteresis (CAH) of dilute aqueous salt solution on graphite surface, i.e., 40.6±0.6o, 34.6±1.4o, and 27.8±0.6o, for LiCl, NaCl, and KCl, indicating the effective tuning of the CAHs by cations. Molecular dynamics simulations reveal that the preferential adsorption of cations on the HOPG surface due to the cation-π interaction pins the water at the backward liquid-gas-solid interfaces, reducing the receding contact angle and hence enhancing the CAH. This finding provides a simple method to control the contact angle and the CAH of aqueous drops on graphitic surfaces such as graphene, carbon nanotube, biomolecules, and airborne pollutants. Copyright ? 2020, The Authors. All rights reserved.