纳米液滴在化学不均匀性附近的运动
Motion of nanodroplets near chemical heterogeneities
摘要：
我们研究了纳米级液滴在化学步骤附近的动力学，该化学步骤将具有不同润湿性的基板的部分分开。由于长程分散力，位于台阶一侧的纳米液滴即使在距离台阶一定距离处也会感知到另一侧的不同特性，从而导致动态响应。这种液滴的随后运动的方向不仅取决于这两个部分上的平衡接触角之间的差，而且特别取决于相应的Hamaker常数之间的差。因此，运动不一定指向更靠近的一侧，并且也可以与跨越台阶的液滴的运动不同。
英文摘要：
We investigate the dynamics of nanoscale droplets in the vicinity of chemical steps which separate parts of a substrate with different wettabilities. Due to long-ranged dispersion forces, nanodroplets positioned on one side of the step perceive the different character of the other side even at some distances from the step, leading to a dynamic response. The direction of the ensuing motion of such droplets does not only depend on the difference between the equilibrium contact angles on these two parts but in particular on the difference between the corresponding Hamaker constants. Therefore the motion is not necessarily directed towards the more wettable side and can also be different from that of droplets which span the step.
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