Analysis of Preload-Dependent Reversible Mechanical Interlocking Using Beetle-Inspired Wing Locking Device

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• 作者：Changhyun Pang ; Daeshik Kang ; Tae-il Kim ; Kahp-Yang Suh
• 刊名：Langmuir
• 出版年：2012
• 出版时间：January 31, 2012
• 年：2012
• 卷：28
• 期：4
• 页码：2181-2186
• 全文大小：388K
• 年卷期：v.28,no.4(January 31, 2012)
• ISSN：1520-5827

文摘

We report an analysis of preload-dependent reversible interlocking between regularly arrayed, high aspect ratio (AR) polymer micro- and nanofibers. Such a reversible interlocking is inspired from the wing-locking device of a beetle where densely populated microhairs (termed microtrichia) on the cuticular surface form numerous hair-to-hair contacts to maximize lateral shear adhesion. To mimic this, we fabricate various high AR, vertical micro- and nanopillars on a flexible substrate and investigate the shear locking force with different preloads (0.1鈥?0 N/cm²). A simple theoretical model is developed based on the competition between van der Waals (VdW) attraction and deflection forces of pillars, which can explain the preload-dependent maximum deflection, tilting angle, and total shear adhesion force.