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Biomimetic Bidirectional Switchable Adhesive Inspired by the Gecko

机译：壁虎启发的仿生双向可切换胶

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摘要

The gecko adhesive system has attracted significant attention since the discovery that van der Waals interactions, which are always present between surfaces, are predominantly responsible for their adhesion. The unique aniso-tropic frictional-adhesive capabilities of the gecko adhesive system originate from complex hierarchical structures and just as importantly, the anisotropic articulation of the structures. Here, by cleverly engineering asymmetric polymeric microstructures, a reusable switchable gecko-like adhesive can be fabricated yielding steady high adhesion (F_⊥≈ 1.25 N/cm~2) and friction (F_‖ ≈ 2.8 N/cm~2) forces when actuated for "gripping", yet release easily with minimal adhesion (F_⊥ ≈ 0.34 N/cm~2) and friction (F_‖≈ 0.38 N/cm~2) forces during detachment or "releasing", over multiple attachment/detachment cycles, with a relatively small normal preload of 0.16 N/cm~2 to initiate the adhesion. These adhesives can also be used to reversibly suspend weights from vertical (e.g., walls), and horizontal (e.g., ceilings) surfaces by simultaneously and judiciously activating anisotropic friction and adhesion forces. This design opens the way for new gecko-like adhesive surfaces and articulation mechanisms that do not rely on intensive nanofabrication in order to recover the anisotropic tribological property of gecko adhesive pads, albeit with lower adhesive forces compared to geckos.
机译：由于发现始终存在于表面之间的范德华相互作用主要是壁虎粘合系统，因此壁虎粘合系统引起了极大的关注。壁虎胶粘剂系统独特的各向异性摩擦胶粘剂功能来自复杂的分层结构，并且同样重要的是，结构的各向异性咬合。在这里，通过巧妙地设计非对称聚合物微观结构，可以制造出可重复使用的可切换壁虎状粘合剂，从而在驱动时产生稳定的高附着力（F_⊥≈1.25 N / cm〜2）和摩擦力（F__≈2.8 N / cm〜2）用于“抓握”，但在多个附着/分离循环过程中，它们在分离或“释放”期间的力（F_⊥≈0.34 N / cm〜2）和摩擦力（F_‖≈0.38 N / cm〜2）很容易释放，相对较小的0.16 N / cm〜2的正常预紧力来启动粘附。这些粘合剂还可用于通过同时并明智地激活各向异性的摩擦力和粘附力来将重物可逆地悬挂在垂直（例如墙壁）和水平（例如天花板）表面上。这种设计为不依赖密集纳米加工的新型壁虎状粘合表面和铰接机制开辟了道路，以恢复壁虎粘合垫的各向异性摩擦学特性，尽管与壁虎相比具有更低的粘合力。

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  • 来源
    《Advanced Functional Materials》 |2014年第5期|574-579|共6页
  • 作者

    Kejia Jin; Joseph C. Cremaldi; Jeffrey S. Erickson; Yu Tian; Jacob N. Israelachvili; Noshir S. Pesika;

  • 作者单位

    Department of Chemical and Biomolecular Engineering Tulane University New Orleans, LA 70118, USA;

    Department of Chemical and Biomolecular Engineering Tulane University New Orleans, LA 70118, USA;

    Center for Bio/Molecular Science and Engineering Naval Research Laboratory Washington, D.C. 20375, USA;

    State Key Laboratory of Tribology Tsinghua University Beijing, 100084, PR China;

    Department of Chemical Engineering University of California Santa Barbara, CA 93106, USA;

    Department of Chemical and Biomolecular Engineering Tulane University New Orleans, LA 70118, USA;

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