Abstract In this study, the early stage of liquid droplet spreading on tunable nanostructures was investigated through high resolved and fast imaging visualization. It is well-known that the early stage of water droplet spreading on a solid surface features an inertia dominance on resistive droplet motion in a short period (~0.01 sec). The spreading dynamic law of this stage differs greatly from those of the classical spreading stage, after the inertia regime, being determined by the balance between a spreading force and viscous friction. The effect of triple line physics associated with the surface properties is generally underestimated in the early inertial regime by a relatively short period and strong inertia momentum, and such physics result in the nature of the spreading ( D t 1 / 2 ). Here, we designed tunable nanostructures that can modify the nature law of the early droplet spreading. The results suggest that the increase of initial spreading momentum attribute to the capillary wicking effect controlled by the nanostructure morphology.

中文翻译：

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液滴在可调纳米结构表面上扩散的早期阶段

摘要 在这项研究中，通过高分辨率和快速成像可视化研究了液滴在可调纳米结构上扩散的早期阶段。众所周知，水滴在固体表面上扩散的早期阶段在短时间内（~0.01 秒）内对阻力液滴运动具有惯性优势。这一阶段的铺展动力学规律与经典铺展阶段有很大不同，在惯性制度之后，由铺展力和粘性摩擦之间的平衡决定。与表面特性相关的三线物理效应在早期惯性状态中通常被相对较短的周期和强大的惯性动量低估，而这种物理导致了扩散的性质（D t 1 / 2 ）。这里，我们设计了可调节的纳米结构，可以改变早期液滴扩散的自然规律。结果表明，初始扩散动量的增加归因于由纳米结构形态控制的毛细管芯吸效应。