State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, People's Republic of China.
Sci Rep. 2013;3:1944. doi: 10.1038/srep01944.
Dynamic wetting on the flexible hydrophilic pillar-arrays is studied using large scale molecular dynamics simulations. For the first time, the combined effect of the surface topology, the intrinsic wettability and the elasticity of a solid on the wetting process is taken into consideration. The direction-dependent dynamics of both liquid and pillars, especially at the moving contact line (MCL), is revealed at atomic level. The flexible pillars accelerate the liquid when the liquid approaches, and pin the liquid when the liquid passes. The liquid deforms the pillars, resulting energy dissipation at the MCL. Scaling analysis is performed based on molecular kinetic theory and validated by our simulations. Our results may expand our knowledge of wetting on pillars and assisting the future design of active control of wetting in practical applications.
使用大规模分子动力学模拟研究了柔性亲水柱阵列上的动态润湿。首次考虑了固体表面拓扑结构、固有润湿性和弹性对润湿过程的综合影响。在原子水平上揭示了液体和柱子的方向相关动力学，特别是在移动接触线（MCL）处。当液体接近时，柔性柱子会加速液体，而当液体通过时，柱子会固定液体。液体使柱子变形，导致在 MCL 处能量耗散。基于分子动理论进行了标度分析，并通过模拟进行了验证。我们的结果可能会扩展我们对在柱子上润湿的认识，并有助于未来在实际应用中主动控制润湿的设计。
