School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
J Colloid Interface Sci. 2012 Dec 15;388(1):235-42. doi: 10.1016/j.jcis.2012.08.033. Epub 2012 Aug 27.
Nature has long been an important source of inspiration for mankind to develop artificial ways to mimic the remarkable properties of biological systems. In this work, a new method was explored to fabricate a superhydrophobic dual-biomimetic surface comprising both the shark-skin surface morphology and the lotus leaf-like hierarchical micro/nano-structures. The biomimetic surface possessing shark-skin pattern microstructure was first fabricated by microreplication of shark-skin surface based on PDMS; and then it was treated by flame to form hierarchical micro/nano-structures that can produce lotus effect. The fabricated biomimetic surfaces were characterized with scanning electron microscopy (SEM), water contact angle measurements and liquid drop impact experiments. The results show that the fabricated dual-biomimetic surface possesses both the vivid shark-skin surface morphology and the lotus leaf-like hierarchical micro/nano-structures. It can exhibit excellent superhydrophobicity that the contact angle is as high as 160° and maintain its robustness of the superhydrophobicity during the droplet impact process at a relatively high Weber number. The mechanism of the micromorphology evolution and microstructural changes on the biomimetic shark-skin surface was also discussed here in the process of flame treatment. This method is expected to be developed into a novel and feasible biomimetic surface manufacturing technique.
大自然一直是人类开发人工方法来模拟生物系统卓越特性的重要灵感来源。在这项工作中，探索了一种新方法来制造一种包含鲨鱼皮表面形貌和荷叶状分级微/纳结构的超疏水双仿生表面。首先通过基于 PDMS 的鲨鱼皮表面的微复制制造具有鲨鱼皮图案微观结构的仿生表面，然后通过火焰处理形成能够产生荷叶效果的分级微/纳结构。用扫描电子显微镜（SEM）、水接触角测量和液滴冲击实验对制备的仿生表面进行了表征。结果表明，所制备的双仿生表面同时具有生动的鲨鱼皮表面形貌和荷叶状分级微/纳结构。它可以表现出优异的超疏水性，接触角高达 160°，并且在相对较高的韦伯数下的液滴冲击过程中保持其超疏水性的稳健性。还讨论了在火焰处理过程中仿生鲨鱼皮表面的微观形态演变和微观结构变化的机制。该方法有望发展成为一种新颖可行的仿生表面制造技术。
