Lab for Micro Molding and Polymer Rheology, The Key Laboratory of Polymer Processing Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510640, China.
Nanoscale. 2017 Aug 24;9(33):11951-11958. doi: 10.1039/c7nr04176d.
The fine nanostructure on the cicada wing of Cryptotympana atrata fabricius, which exhibits hydrophobicity and antireflectivity, is carefully examined. A promising strategy is proposed for facilely and successively replicating the natural functional nanostructure of the cicada wing onto polystyrene (PS) surfaces. First, a nickel replica with tapered nanopores is fabricated by combining electroless plating and subsequent electroplating with the natural cicada wing as an original template. Then, using microinjection compression molding, with the nickel replica as a template, the tapered nanopores are transcribed onto the PS surface, resulting in orderly and densely arranged nanopillars with a mean diameter of about 156 nm and a mean pitch of about 180 nm. The natural cicada wing and fabricated nickel replica are reusable. Interestingly, the PS replica surface exhibits a water contact angle of 143° ± 2° and a reflectance of about 4% in the wavelength range of 400-1000 nm. These results mean that the bionic PS replica not only inherits the nanostructure of the natural wing, but also its hydrophobic and antireflective properties. The mechanisms for the hydrophobic and antireflective properties are revealed via composite wetting interface and effective medium layer on the replica surface, respectively. The proposed fast and efficient replication strategy can be an excellent candidate for mimicking bio-inspired functional micro/nanostructures without complicated procedures and expensive materials.
仔细研究了Cryptotympana atrata fabricius蝉翼上的精细纳米结构，该结构表现出疏水性和抗反射性。提出了一种很有前途的策略，可以方便且连续地将蝉翼的天然功能纳米结构复制到聚苯乙烯（PS）表面上。首先，通过将无电镀和随后的电镀与天然蝉翼作为原始模板相结合，制造出具有锥形纳米孔的镍复制件。然后，使用微注射压缩成型，以镍复制件为模板，将锥形纳米孔转录到 PS 表面上，形成有序且密集排列的纳米柱，其平均直径约为 156nm，平均间距约为 180nm。天然蝉翼和制造的镍复制件可重复使用。有趣的是，PS 复制件表面的水接触角为 143°±2°，在 400-1000nm 的波长范围内的反射率约为 4%。这些结果意味着仿生 PS 复制件不仅继承了天然翼的纳米结构，还继承了其疏水性和抗反射性。通过复合润湿界面和复制表面上的有效介质层，揭示了疏水性和抗反射性的机制。所提出的快速有效的复制策略可以作为模拟仿生功能微/纳米结构的优秀候选方案，无需复杂的程序和昂贵的材料。
