Superhydrophobic gecko feet with high adhesive forces towards water and their bio-inspired materials
Superhydrophobic gecko feet with high adhesive forces towards water and their bio-inspired materials
复制标题
对水及其仿生材料具有高粘附力的超疏水壁虎脚
DOI：
10.1039/c1nr11369k
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Jiang, Lei
中科院分区：
文献类型：
--
作者：
Liu, Kesong;Du, Jiexing;Jiang, Lei
功能集成是生物材料多尺度结构的内在特征。在这篇文章中，我们首先使用高灵敏度的微机电平衡系统研究了水滴与超疏水壁虎脚之间的液-固粘附力。结果发现，除了众所周知的固-固粘附之外，具有多尺度结构的壁虎脚具有超疏水功能和对水的高粘附力。壁虎脚对水的高粘附力的起源可以归因于与水接触的高密度纳米柱。受此启发，通过使用阳极氧化铝模板构建具有壁虎状多尺度结构的聚酰亚胺薄膜，表现出超疏水性和对水的强粘附力。静态水接触角大于150 °，对水的粘附力约为66 μ N。由此产生的壁虎启发聚酰亚胺薄膜可以用作“机械手”抓取微升液体。我们期望这一工作能为揭示壁虎高粘附性超疏水的机理和拓展聚酰亚胺材料的实际应用提供启发。
Functional integration is an inherent characteristic for multiscale structures of biological materials. In this contribution, we first investigate the liquid-solid adhesive forces between water droplets and superhydrophobic gecko feet using a high-sensitivity micro-electromechanical balance system. It was found, in addition to the well-known solid-solid adhesion, the gecko foot, with a multiscale structure, possesses both superhydrophobic functionality and a high adhesive force towards water. The origin of the high adhesive forces of gecko feet to water could be attributed to the high density nanopillars that contact the water. Inspired by this, polyimide films with gecko-like multiscale structures were constructed by using anodic aluminum oxide templates, exhibiting superhydrophobicity and a strong adhesive force towards water. The static water contact angle is larger than 150 degrees and the adhesive force to water is about 66 mu N. The resultant gecko-inspired polyimide film can be used as a "mechanical hand" to snatch micro-liter liquids. We expect this work will provide the inspiration to reveal the mechanism of the high-adhesive superhydrophobic of geckos and extend the practical applications of polyimide materials.