1 Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 School of Physics, Shandong University, Jinan 250100, China; 4 School of Arts and Sciences, Shanghai Dianji University, Shanghai 201306, China; 5 Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China; 6 Department of Physics, East China University of Science and Technology, Shanghai 200237, China; 7 College of Physical Science and Technology, Yangzhou University, Jiangsu 225009, China
Abstract Using molecular dynamics simulations, we have revealed a novel wetting phenomenon with a droplet on composite structures formed by embedded water into (111) surface of β-cristobalite hydroxylated silica. This can be attributed to the formation of a composite structure composed of embedded water molecules and the surface hydroxyl (-OH) groups, which reduces the number of hydrogen bonds between the composite structure and the water droplet above the composite structure. Interestingly, a small uniform strain ( 3%) applied to the crystal lattice of the hydroxylated silica surface can result in a notable change of the contact angles (>40°) on the surface. The finding provides new insights into the correlation between the molecular-scale interfacial water structures and the macroscopic wettability of the hydroxylated silica surface.
(Other topics in statistical physics, thermodynamics, and nonlinear dynamical systems)
Fund: Project supported by the National Natural Science Foundation of China (Grant No.11674345), the Key Research Program of Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH019), and the Fundamental Research Funds for the Central Universities, China.
Corresponding Authors: † These authors contributed equally to this work. ‡ Corresponding author. E-mail: leixiaoling@ecust.edu.cn §Corresponding author. E-mail: zhaoliang@yzu.edu.cn ¶Corresponding author. E-mail: wangchunlei@zjlab.org.cn
Cite this article:
Hanqi Gong(龚菡琪), Chonghai Qi(齐崇海), Junwei Yang(杨俊伟), Jige Chen(陈济舸), Xiaoling Lei(雷晓玲), Liang Zhao(赵亮), and Chunlei Wang(王春雷) Stable water droplets on composite structures formed by embedded water into fully hydroxylated β-cristobalite silica 2021 Chin. Phys. B 30 010503
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