Directional transportation of water flow, which is frequently seen in nature, is of not only great importance to organisms but also crucial demand for advanced science and technologies. Numerous contributions have been dedicated to the motion manipulation of single drops on chemically heterogeneous surfaces, which have hydrophilic/superhydrophobic patterns in general. Drop retention is therefore difficult to avoid due to the hydrophilic regions, and continuous transportation of water flow still remains a challenge. Here, a hydrophobic/superhydrophobic patterned surface, featured with chemical homogeneity, is developed via a simple coating on a morphologically heterogeneous surface. Such surface can guide the continuous water motions, and relationship between the surface patterns and the motion controllability is clarified. Additionally, the potential application of the patterned films is explored as a micro-mixing device for different drops. The finding and results are essential for advancing more applications of microfluidics and microchips.

在自然界中经常看到的水的定向输送不仅对生物非常重要，而且对先进科学和技术也有至关重要的需求。对于化学异质表面上的单滴的运动操纵已做出了许多贡献，这些化学异质表面通常具有亲水性/超疏水性图案。因此，由于亲水区域而难以避免液滴保持，并且水流的连续运输仍然是一个挑战。在此，通过在形态上异质的表面上进行简单的涂层处理，就形成了具有化学均一性的疏水/超疏水图案化表面。这样的表面可以引导连续的水运动，并且阐明了表面图案与运动可控制性之间的关系。此外，探索了图案化薄膜的潜在应用，将其作为用于不同液滴的微混合装置。该发现和结果对于推进微流体和微芯片的更多应用是必不可少的。