State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, People's Republic of China.
J R Soc Interface. 2012 Oct 7;9(75):2424-36. doi: 10.1098/rsif.2012.0200. Epub 2012 May 9.
Despite successful fabrication of gecko-inspired fibrillar surfaces with strong adhesion forces, how to achieve an easy-removal property becomes a major concern that may restrict the wide applications of these bio-inspired surfaces. Research on how geckos detach rapidly has inspired the design of novel adhesive surfaces with strong and reversible adhesion capabilities, which relies on further fundamental understanding of the peeling mechanisms. Recent studies showed that the peel-zone plays an important role in the peeling off of adhesive tapes or fibrillar surfaces. In this study, a numerical method was developed to evaluate peel-zone deformation and the resulting mechanical behaviour due to the deformations of fibrillar surfaces detaching from a smooth rigid substrate. The effect of the geometrical parameters of pillars and the stiffness of backing layer on the peel-zone and peel strength, and the strong attachment and easy-removal properties have been analysed to establish a design map for bio-inspired fibrillar surfaces, which shows that the optimized strong attachment and easy-removal properties can vary by over three orders of magnitude. The adhesion and peeling design map established provides new insights into the design and development of novel gecko-inspired fibrillar surfaces.
尽管已经成功制造出具有强大粘附力的仿壁虎纤维状表面，但如何实现易于去除的特性仍然是一个主要关注点，这可能会限制这些仿生表面的广泛应用。对壁虎如何快速脱离的研究启发了具有强且可重复粘附力的新型粘附表面的设计，这依赖于对剥离机制的进一步深入理解。最近的研究表明，在胶带或纤维状表面的剥离过程中，剥离区起着重要作用。在这项研究中，开发了一种数值方法来评估纤维状表面从光滑刚性基底上脱离时的剥离区变形以及由此产生的力学行为。分析了柱体的几何参数和背衬层的刚度对剥离区和剥离强度的影响，以及强附着和易于去除的特性，为仿生纤维状表面建立了设计图，结果表明，优化后的强附着和易于去除的特性可以相差三个数量级以上。建立的粘附和剥离设计图为新型仿壁虎纤维状表面的设计和开发提供了新的思路。
