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The directional transport of water droplets has great potential applications in biochemical analysis. An aluminium (Al) alloy surface with a contact angle (CA) of 154° and a sliding angle of about 3.5° was prepared by the electrochemical etching method, which is eco-friendly and economic. An arc path line with a radius of 50 mm and a width of 400 μm was created on the superhydrophobic surface by means...
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