Abstract：
Realizing jumping detachment of condensed droplets from solid surfaces at the smallest sizes possible is vital for applications such as antifogging/frosting and heat transfer. For instance, if droplets uniformly jump at sizes smaller than visible light wavelengths of 400-720 nm, antifogging issues could be resolved. In comparison, the smallest droplets experimentally observed so far to jump uniformly were around 16 μm in radius. Here, we show molecular dynamics (MD) simulations of persistent droplet jumping with a uniform radius down to only 3.6 nm on superhydrophobic thin-walled lattice (TWL) nanostructures integrated with superhydrophilic nanospots. The size cutoff is attributed to the preferential cross-lattice coalescence of island droplets. As an application, the MD results exhibit a 10× boost in the heat transfer coefficient (HTC), showing a -1 scaling law with the maximum droplet radius. We provide phase diagrams for jumping and wetting behaviors to guide the design of lattice structures with advanced antidew performance.
摘要：
实现冷凝液滴以最小尺寸从固体表面的跳跃分离对于诸如防雾/结霜和传热的应用至关重要。例如,如果液滴以小于400-720nm可见光波长的尺寸均匀跳跃，防雾问题可以解决。相比之下,迄今为止，通过实验观察到的均匀跳跃的最小液滴半径约为16μm。这里,我们显示了在超疏水薄壁晶格（TWL）纳米结构上与超亲水纳米点集成的均匀半径低至3.6nm的持续液滴跳跃的分子动力学（MD）模拟。尺寸截止归因于岛液滴的优先交叉晶格聚结。作为一个应用程序,MD结果显示传热系数(HTC)提高了10倍，显示最大液滴半径的-1缩放定律。我们提供了跳跃和润湿行为的相图，以指导具有高级防露性能的晶格结构的设计。
