An easy-to-implement method for fabricating superhydrophobic surfaces inspired by taro leaf

作者：Li KaiKai; Lei Jiang; Xie YingXi; Lu LongSheng^*; Zhang ShaoHui; Zhou PeiYang; Liang RongXuan; Wan ZhenPing; Tang Yong

来源：Science in China Series E-Technological Sciences, 2021, 64(12): 2676-2687.

DOI：10.1007/s11431-021-1855-2

• taro leaf
• superhydrophobic surface
• micro-nano hierarchical structures
• robustness
• durability

An easy-to-implement method by which to fabricate superhydrophobic surfaces inspired taro leaf was successfully applied on 316L stainless steel via combining nanosecond laser (NL) processing and spin-coating techniques. The laser-textured surface composed of microscale frameworks and central bumps was fabricated by NL processing based on properly designed biomimetic patterns, and a layer of nanoscale carbon black/polydimethylsiloxane (CB/PDMS) particles was covered on it by spin-coating. The effect of pattern parameters (i.e., the inscribed circle radius of framework and the radius of central bump) on wettability of biomimetic surface was investigated. All as-prepared biomimetic surfaces with micro-nano hierarchical structures showed excellent superhydrophobicity with the water contact angle of similar to 155 degrees and contact angle hysteresis of similar to 2 degrees. By comparing the untreated surface, the wetting behavior and evaporation mode of the biomimetic surface occurred an obvious transformation. Meanwhile, experiments indicated that the biomimetic surface not only had liquid-repelling and self-cleaning functions, but also maintained remarkable mechanical robustness and superhydrophobic durability. The method is efficient for fabricating biomimetic superhydrophobic surfaces applied to liquid-repelling, evaporation-transforming and self-cleaning fields.

• 单位
  华南农业大学; 中国科学院