Splash, one of the most visually apparent droplet dynamics, can manifest on any surface above a certain impact velocity, regardless of surface wettability. Previous studies demonstrate that elevating the substrate temperature can suppress droplet splash, which is unfavorable for many practical applications, such as spray cooling and combustion. Here, we report that the suppression effect of substrate temperature on splash is nullified by utilizing surfaces with nanostructures. By manipulating air evacuation time through surface nanostructures, we have identified a pathway for precise control over the splash threshold and the ability to tailor the dependence of the splash onset on surface temperature. We further propose a theoretical criterion to determine different splash regimes by considering the competition between air evacuation and the development of flow instabilities. Our findings underscore the crucial role of nanostructures in splash dynamics, offering valuable insights for the control of splash in various industrial scenarios.

中文翻译：

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表面纳米结构促进液滴飞溅在热基材上

飞溅是视觉上最明显的液滴动力学之一，无论表面润湿性如何，都可以在高于一定冲击速度的任何表面上显现。先前的研究表明，提高基底温度可以抑制液滴飞溅，这对于许多实际应用（例如喷雾冷却和燃烧）是不利的。在这里，我们报告说，通过利用具有纳米结构的表面，基底温度对飞溅的抑制作用被抵消。通过表面纳米结构操纵空气排出时间，我们已经确定了精确控制飞溅阈值的途径以及定制飞溅开始对表面温度的依赖性的能力。我们进一步提出了一个理论标准，通过考虑空气疏散和流动不稳定性的发展之间的竞争来确定不同的飞溅状态。我们的研究结果强调了纳米结构在飞溅动力学中的关键作用，为各种工业场景中的飞溅控制提供了宝贵的见解。