Directional transport of water droplet on curved track attracts considerable research interest in microfluidics. In this work, we first study the directional transport of water droplet on super-hydrophilic curved track. The water droplet can quickly move along the whole super-hydrophilic track without deviation. The speed of the water droplet on the super-hydrophilic track is 0.075 m/s. In theory, the van der Waals’ force existing in the super-hydrophilic track keeps the water droplet from deviating during rapid movement. In addition, we further study the influence of track geometry and water droplet size on the transport capacity of the super-hydrophilic track. Compared with track depth, the track width has a great effect. The water droplet deviates from the track with a width of 50 μm. But the water droplet can directionally move along the super-hydrophilic track with a width of 100 μm and 150 μm without deviation. In addition, for the same super-hydrophilic track, the larger the water droplet volume, the easier it is to deviate from the track. Finally, to demonstrate the application of super-hydrophilic track on superhydrophobic surface, we performed the rapid mixing and directional collection of water droplets. This strategy is of great significance for extending it to applications such as microchannels in microfluidics, water collection systems, and others.

水滴在弯曲轨道上的定向传输引起了微流体领域的大量研究兴趣。在这项工作中，我们首先研究水滴在超亲水曲线轨道上的定向传输。水滴可以在整个超亲水轨道上快速移动，而不会发生偏离。超亲水轨道上的水滴速度为0.075 m / s。从理论上讲，超亲水轨道中存在的范德华力使水滴在快速运动时不会偏离。此外，我们进一步研究了轨道几何形状和水滴尺寸对超亲水轨道的运输能力的影响。与轨道深度相比，轨道宽度具有很大的影响。水滴偏离轨道的宽度为50μm。但是水滴可以沿超亲水轨道定向移动，宽度为100μm和150μm，而不会发生偏离。另外，对于相同的超亲水轨道，水滴体积越大，越容易偏离轨道。最后，为演示超亲水径迹在超疏水表面上的应用，我们进行了水滴的快速混合和定向收集。该策略对于将其扩展到微流控中的微通道，集水系统等应用中具有重要意义。为了演示超疏水径迹在超疏水表面上的应用，我们进行了水滴的快速混合和定向收集。该策略对于将其扩展到微流控中的微通道，集水系统等应用中具有重要意义。为了演示超疏水径迹在超疏水表面上的应用，我们进行了水滴的快速混合和定向收集。该策略对于将其扩展到微流控中的微通道，集水系统等应用中具有重要意义。