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Biomimetic high water adhesion superhydrophobic surface via UV nanoimprint lithography
Applied Surface Science ( IF 6.7 ) Pub Date : 2023-05-30 , DOI: 10.1016/j.apsusc.2023.157610
Haiqiao Zhang, Jian Gan, Yan Wu, Zhihui Wu

Imitating nature and comprehending its workings is a means for human beings to advance the development of functional materials. In this study, UV nanoimprint lithography technology was utilized to successfully replicate the micro-nano hierarchical structure (micro-papillae and nano-wax tube crystals) present on the surface of the natural fresh lotus leaf. A series of UV-curable polyurethane acrylate (UV-WPUA) surfaces with special wetting and superhydrophobic properties were obtained. The polydimethylsiloxane negative stamp with lotus leaf’s structure was obtained through a stamp replica molding method, and then the UV-WPUA resin covered with the negative stamp was exposed to 172 nm Xe2* excimer and medium-pressure mercury lamp to mimic the micro-nano hierarchical structure of the lotus leaf. The UV-WPUA surfaces displayed high water adhesion superhydrophobic properties, with a water contact angle reaching 160.8 ° and water adhesive force of 140.0 μN, and exhibiting excellent self-cleaning performance. The results indicate that higher the UV intensity, the more accurately the surface replicates the micro-nano hierarchical structure of the lotus leaf, resulting in larger water contact angle and higher adhesive force. This study paves the way for the advancement of functional surfaces through the simulation of natural materials.



中文翻译:

紫外纳米压印光刻仿生高水粘附超疏水表面

模仿自然、理解自然是人类推动功能材料发展的一种手段。本研究利用紫外纳米压印光刻技术,成功复制了天然新鲜荷叶表面的微纳米层次结构(微乳突和纳米蜡管晶体)。获得了一系列具有特殊润湿和超疏水性能的紫外线固化聚氨酯丙烯酸酯 (UV-WPUA) 表面。通过印模复制成型法获得具有荷叶结构的聚二甲基硅氧烷负印模,然后将覆盖负印模的UV-WPUA树脂进行172 nm Xe 2曝光* 准分子和中压汞灯模仿荷叶的微纳米层次结构。UV-WPUA表面表现出高水粘附超疏水性能,水接触角达到160.8°,水粘附力为140.0 μN,表现出优异的自清洁性能。结果表明,紫外线强度越高,表面越准确地复制荷叶的微纳米层次结构,从而导致更大的水接触角和更高的附着力。这项研究通过模拟天然材料为功能表面的进步铺平了道路。

更新日期:2023-05-30
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