Bioinspired structure adhesives have received increasing interest for many applications, such as climbing robots and medical devices. Inspired by the closely packed keratin nanopillars on the toe pads of tree frogs, tightly arranged polycaprolactone nanorod arrays are prepared by mold process and chemical modification. Nanorod arrays show enhanced adhesion and friction on both smooth and rough surfaces compared to the arrays with hexagonal micropillars. The bonding of nanorods results in a larger stiffness of the nanorod surface, contributing mainly to friction rather than adhesion. The results suggest the function of closely packed keratin nanopillars on the toe pad of tree frogs and offer a guiding principle for the designing of new structured adhesives with strong attaching abilities.

中文翻译：

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树蛙启发的纳米柱阵列用于增强粘附和摩擦

仿生结构粘合剂在许多应用中越来越受到关注，例如攀爬机器人和医疗设备。受树蛙脚趾垫上紧密堆积的角蛋白纳米柱的启发，通过模具工艺和化学改性制备了紧密排列的聚己内酯纳米棒阵列。与具有六边形微柱的阵列相比，纳米棒阵列在光滑和粗糙的表面上都表现出增强的附着力和摩擦力。纳米棒的结合导致纳米棒表面的刚度更大，主要有助于摩擦而不是粘附。结果表明紧密堆积的角蛋白纳米柱在树蛙脚趾垫上的功能，并为设计具有强附着能力的新型结构粘合剂提供了指导原则。