A reversible wet/dry adhesive inspired by mussels and geckos
A reversible wet/dry adhesive inspired by mussels and geckos
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DOI：
10.1038/nature05968
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发表时间：
2007-07-19
期刊：
影响因子：
64.8
通讯作者：
Messersmith, Phillip B.
中科院分区：
文献类型：
--
作者：
Lee, Haeshin;Lee, Bruce P.;Messersmith, Phillip B.
壁虎的粘附策略依赖于由称为刚毛的特殊角状足毛组成的脚垫，这些足毛被细分为大约200纳米的末端刮刀（参考文献1）。壁虎的脚与相对表面的接触产生的附着力足以让壁虎附着在垂直甚至倒立的表面上。虽然附着力很强，但这种附着力是暂时的，允许壁虎脚在运动过程中快速分离和重新附着。研究人员试图在具有纳米级表面特征的合成模拟物中捕捉壁虎粘合剂的这些特性（2-7）；然而，在许多循环中，粘附性能的维持一直是难以捉摸的（2,8），壁虎的粘附能力在完全浸入水中后大大降低（9,10）。在这里，我们报告了一种混合的生物灵感粘合剂，由一系列纳米制造的聚合物柱组成，表面涂有一层薄薄的合成聚合物，模仿贻贝支架中发现的湿粘合蛋白。纳米结构聚合物柱阵列在涂覆贻贝聚合物后，其湿粘附性提高了近15倍。该系统在干燥和潮湿环境中保持其超过一千次接触循环的粘接性能。这种混合粘合剂结合了壁虎和贻贝粘合剂的突出设计元素，可以在任何环境下可逆地附着在各种表面上。
The adhesive strategy of the gecko relies on foot pads composed of specialized keratinous foot-hairs called setae, which are subdivided into terminal spatulae of approximately 200 nm (ref.1). Contact between the gecko foot and an opposing surface generates adhesive forces that are sufficient to allow the gecko to cling onto vertical and even inverted surfaces. Although strong, the adhesion is temporary, permitting rapid detachment and reattachment of the gecko foot during locomotion. Researchers have attempted to capture these properties of gecko adhesive in synthetic mimics with nanoscale surface features reminiscent of setae(2-7); however, maintenance of adhesive performance over many cycles has been elusive(2,8), and gecko adhesion is greatly diminished upon full immersion in water(9,10). Here we report a hybrid biologically inspired adhesive consisting of an array of nanofabricated polymer pillars coated with a thin layer of a synthetic polymer that mimics the wet adhesive proteins found in mussel holdfasts. Wet adhesion of the nanostructured polymer pillar arrays increased nearly 15-fold when coated with mussel-mimetic polymer. The system maintains its adhesive performance for over a thousand contact cycles in both dry and wet environments. This hybrid adhesive, which combines the salient design elements of both gecko and mussel adhesives, should be useful for reversible attachment to a variety of surfaces in any environment.