Advances in research on directional movement of droplets on wetted anisotropic surfaces

Research of the droplet movement on the wetting of the heterogeneous surface has important application value in, for example, oil-water separation, water collection, etc., and has become a research hotspot in the field of surface interface. In addition, the research on the directional motion of the the droplets on wetting anisotropic surface is of great significance for understanding the solid-liquid interaction and developing a high-performance wetting anisotropic surface. This paper introduces the directional movement of droplets on the wetting anisotropic surface in detail including the wedge-shaped surface, groove surface, hydrophilic-hydrophobic surface, asymmetric topography surface and biological surface. The typical cases of directional movement of droplets on a wetting anisotropic surface at home and abroad are shown. Finally, a summary and prospect are provided for future research.