Functionally Graded Gecko Setae and the Biomimics with Robust Adhesion and Durability,ACS Applied Polymer Materials

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Functionally Graded Gecko Setae and the Biomimics with Robust Adhesion and Durability
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-06-03 , DOI: 10.1021/acsapm.0c00282
Xiaoxiao Dong ₁ , Rui Zhang ₁ , Yu Tian ₂ , Melvin A. Ramos ₃ , Travis Shihao Hu ₃ , Zhihang Wang ₁ , Hong Zhao ₁ , Lipeng Zhang ₄ , Yiyang Wan ₅ , Zhenhai Xia ₅ , Quan Xu ₁

Affiliation

Geckos have the extraordinary ability to adhere and move across varied surfaces, while keeping their tiny high-aspect-ratio foot-hairs intact for thousands of attachment–detachment cycles. Inspired by the dry adhesive structure of gecko sole, various gecko-inspired artificial mimics have been developed, but many of them suffer from premature failures and short fatigue life. Herein, we discover that individual gecko seta is a functionally graded material. Its Young’s modulus gradually decreases from base to tip, with up to 20 times of difference in magnitude. Finite element analysis indicates that this gradient design is the key to make the natural setal stalks more flexible (critical for producing large frictional adhesion on rough surfaces) and less stressed (critical for achieving high fatigue resistance) during each attachment. Inspired by these findings, we have fabricated poly(dimethylsiloxane) (PDMS)-based artificial gecko foot-hairs with a gradient distribution of magnetic nanoparticles as the reinforcements, achieving similar varying modulus/stiffness. The biomimetic hairs/pillars show enhanced fatigue resistance compared to the uniform counterparts. This work opens a door in designing dry adhesives with both high adhesive strength and long fatigue life.

中文翻译：

功能分级的壁虎刚毛和具有坚固附着力和耐用性的仿生植物

壁虎具有非凡的附着力和在不同表面上移动的能力，同时可以在数千个附着-分离循环中保持它们细小的高纵横比脚毛。受壁虎鞋底干胶结构的启发，已开发出各种受壁虎启发的人造模拟物，但其中许多模拟物过早失效且疲劳寿命短。在这里，我们发现单个壁虎seta是一种功能分级的材料。其杨氏模量从基部到尖端逐渐减小，幅度差高达20倍。有限元分析表明，这种梯度设计是使天然结实茎更柔韧（对于在粗糙表面上产生较大的摩擦粘附力至关重要）和减轻每次附着过程中的应力（对实现高抗疲劳性至关重要）的关键。受到这些发现的启发，我们制造了基于聚二甲基硅氧烷（PDMS）的人造壁虎脚毛，其磁性纳米颗粒的梯度分布作为增强材料，实现了相似的变化模量/刚度。仿生毛发/毛发与均匀的毛发/毛发相比具有更高的抗疲劳性。这项工作为设计具有高粘合强度和长疲劳寿命的干胶打开了一扇门。

更新日期：2020-07-10

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