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论文类型：期刊论文

发表时间：2015-07-01

发表刊物：MICRO & NANO LETTERS

收录刊物：SCIE、EI、Scopus

卷号：10

期号：7

页面范围：343-346

ISSN号：1750-0443

关键字：drops; hydrophobicity; aluminium alloys; contact angle; etching; electrochemistry; wetting; photolithography; directional transport; water droplets; superhydrophobic aluminium alloy surface; contact angle; sliding angle; electrochemical etching method; arc path line; lithography; anisotropic wettability; patterned surface; time 8 month

摘要：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 degrees and a sliding angle of about 3.5 degrees 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 m was created on the superhydrophobic surface by means of lithography. CAs of water droplets on the lines exhibit anisotropy and 50 l water droplets could slide exactly along the created line when the substrate was tilted to about 7 degrees. The anisotropic wettability and mechanism of water droplets transport on the surface was investigated. The surface still has great water transport capability after 8 months, indicating that the water transport property of the patterned surface is stable and persistent. This method combines electrochemical etching and lithography; it is universal and economical, and could be used to build patterns on various substrates to realise the directional transport of water droplets.