Humidity-Modulated Core–Shell Nanopillars for Enhancement of Gecko-Inspired Adhesion,ACS Applied Nano Materials

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Humidity-Modulated Core–Shell Nanopillars for Enhancement of Gecko-Inspired Adhesion
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsanm.0c00314
Di Tan ₁ , Aoyi Luo ₂ , Xin Wang ₁ , Zhekun Shi ₁ , Yifeng Lei ₁ , Martin Steinhart ₃ , Alexander Kovalev ₄ , Stanislav N. Gorb ₄ , Kevin T. Turner ₂ , Longjian Xue ₁

Affiliation

The contribution of water to gecko and gecko-inspired adhesion remains a debate. Here, by investigating the adhesion performances of gecko-inspired nanopillar arrays in humid environments, the function of water in dry adhesion is discussed. Adhesion increases with the increase of relative humidity for both hydrophilic and hydrophobic nanopillar arrays. The superficial layer of both kinds of nanopillars are softened by water, forming a kind of “soft shell–stiff core” structure. The core–shell structure reduces the stress at contact perimeter, enlarges the cohesive zone, and increases the tolerance to misalignment on contacting surfaces, contributing to the enhancement of normal adhesion. The result suggests a mechanism for the function of water in gecko and gecko-inspired dry adhesions.

中文翻译：

湿度调节的核-壳纳米柱增强了壁虎的附着力。

水对壁虎和壁虎启发的粘附的贡献仍然是一个争论。在这里，通过研究壁虎启发的纳米柱阵列在潮湿环境中的粘附性能，讨论了水在干粘附中的功能。对于亲水性和疏水性纳米柱阵列，粘附力都随着相对湿度的增加而增加。两种纳米柱的表层都被水软化，形成一种“软壳-硬核”结构。核-壳结构减少了接触周长的应力，扩大了内聚区，并增加了对接触表面未对准的容忍度，有助于增强正常的粘附力。该结果提示了水在壁虎和壁虎启发的干粘连中的功能机制。

更新日期：2020-03-30

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