Wu Yuhao, Ma Zeyu, Wang Zeyuan, Lu Shan, Qin Liguo, Zheng Tengfei, Dong Guangneng
Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Institute of Design Science and Basic Components, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.
School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.
Langmuir. 2024 Sep 17;40(37):19853-19860. doi: 10.1021/acs.langmuir.4c02788. Epub 2024 Sep 4.
Investigating droplet wetting and icing behavior is crucial for comprehending the principles of surface icing and the design of anti-icing surfaces. In this study, we present the evidence from molecular dynamics (MD) simulations that reveal a hitherto unreported behavior of droplet wetting and icing adhesion on surfaces with lattice constants from 2.7 to 4.5 Å. Here, we observe that the contact angles (CA) of droplets on a face-centered cubic (FCC) lattice surface consistently correlate positively with the lattice constant. Further examination of droplet behavior on an idealized crystal surface reveals that hydrophilic surfaces (e.g., CA = 85°) inhibit freezing more effectively than hydrophobic surfaces (e.g., CA = 97°). This finding contradicts the conventional explanation that hydrophobic surfaces reduce heterogeneous nucleation, thereby delaying icing. This study introduces a mechanistic explanation for the promotion of water icing by hydrophobic surfaces and offers a novel design concept for the development of anti-ice surfaces in future applications.
研究液滴的润湿和结冰行为对于理解表面结冰原理和防冰表面设计至关重要。在本研究中，我们展示了分子动力学（MD）模拟的证据，这些证据揭示了在晶格常数为2.7至4.5 Å的表面上，液滴润湿和结冰粘附存在一种迄今未报道的行为。在此，我们观察到液滴在面心立方（FCC）晶格表面上的接触角（CA）与晶格常数始终呈正相关。对理想化晶体表面上液滴行为的进一步研究表明，亲水性表面（例如，CA = 85°）比疏水性表面（例如，CA = 97°）更有效地抑制结冰。这一发现与传统观点相悖，传统观点认为疏水性表面会减少异质形核，从而延迟结冰。本研究为疏水性表面促进水结冰现象引入了一种机理解释，并为未来应用中防冰表面的开发提供了一种新颖的设计理念。
