论文标题
通用快速模式和润湿动力学的潜在依赖性方案
Universal Fast Mode and Potential-dependent Regimes in Wetting Kinetics
论文作者
论文摘要
我们从润湿表面上不稳定的对称二元混合物中表面定向的旋缺链分解（SDSD）进行了全面的分子动力学（MD）研究，提出了模拟结果。我们考虑长期且较短的地表场，以研究早期润湿动力学。长期潜力的有吸引力的部分是$ v（z）\ sim z^{ - n} $的表格，其中$ z $是距表面的距离，而$ n $是power-law offenent。我们发现，在很早的时候，湿层厚度$ r_1（t）$表现出幂律增长，指数$α= 1/（n+2）$。然后，它越过$α= 3/2 $的通用快速模式。相比之下，对于短距离的表面电势，在初始时间观察到$ r_1（t）$中的对数行为。值得注意的是，在这种情况下，也可以看到类似的快速增长。我们提供现象学论据来理解这些增长法。我们的MD结果牢固地确定了通用快速动力学的存在并解决相关的争议。
We present simulation results from a comprehensive molecular dynamics (MD) study of surface-directed spinodal decomposition (SDSD) in unstable symmetric binary mixtures at wetting surfaces. We consider long-ranged and short-ranged surface fields to investigate the early-stage wetting kinetics. The attractive part of the long-ranged potential is of the form $V(z) \sim z^{-n}$, where $z$ is the distance from the surface and $n$ is the power-law exponent. We find that the wetting-layer thickness $R_1(t)$ at very early times exhibits a power-law growth with an exponent $α= 1/(n+2)$. It then crosses over to a universal fast-mode regime with $α=3/2$. In contrast, for the short-ranged surface potential, a logarithmic behavior in $R_1(t)$ is observed at initial times. Remarkably, similar rapid growth is seen in this case too. We provide phenomenological arguments to understand these growth laws. Our MD results firmly establish the existence of universal fast-mode kinetics and settle the related controversy.
