Controllable fluid transport is widely present in various natural systems and practical projects, and has broad application prospects in the fields of microfluidics, condensation heat transfer, anti-icing, and interface drag reduction. Since the establishment of the basic theory of surface/interface science wettability, scholars at home and abroad have generally believed that liquids tend to move spontaneously in the direction of system energy reduction. The direction of movement mainly depends on the surface structure characteristics and chemical composition, and has nothing to do with the properties of the liquid. However, whether the liquid can determine its fate and realize the autonomous choice of the direction of movement without changing the surface structure and without energy input is a scientific problem that has plagued scholars for a long time.
Recently, Professor Wang Zuankai of the City University of Hong Kong and his collaborators used the characteristics of the multiple cantilever structures of Araucaria cedar leaves to prepare a 3D capillary zigzag structure that mimics Araucaria. By establishing a 3D solid/liquid interface interaction, the fluid movement direction can be independently selected. . The research was published in the top international journal Science with the title “3D capillary ratchet-induced liquid directional steering”. Associate Professor Feng Shile from Dalian University of Technology and Assistant Professor Zhu Pingan from City University of Hong Kong are the co-first authors of the paper, and Professor Wang Zuankai from City University of Hong Kong is the corresponding author of the paper.
Key points: Researchers use PμSL based on the structural characteristics of Araucaria leaves 3D printingTechnology (nanoArch® S140, Mofang Precision), designed and prepared a 3D-like Araucaria 3D capillary sawtooth structure surface and a surface with a symmetrical vertical plane leaf structure composed of a sawtooth array with a double cantilever structure with horizontal and longitudinal curvature arranged in parallel. , The surface with inclined plane blade structure and the surface with parallel groove structure.3D printingThe resin used in the technology is acrylic photosensitive resin, the curing ultraviolet light wavelength is 405 nm, the energy density, exposure time, exposure resolution, and printing layer thickness are 30 mW/cm2, 1 s, 10 μm, and 10 μm, respectively. The blade pitch p is 750 μm, the row pitch w is 1000 μm, and the blade inclination angle is 15
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