Xue Longjian, Kovalev Alexander, Eichler-Volf Anna, Steinhart Martin, Gorb Stanislav N
1] Institut für Chemie neuer Materialien and Zentrum für Physik und Chemie neuer Materialien, Universität Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany [2] Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 9, 24118 Kiel, Germany.
Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 9, 24118 Kiel, Germany.
Nat Commun. 2015 Mar 20;6:6621. doi: 10.1038/ncomms7621.
Many insect species reversibly adhere to surfaces by combining contact splitting (contact formation via fibrillar contact elements) and wet adhesion (supply of liquid secretion via pores in the insects' feet). Here, we fabricate insect-inspired fibrillar pads for wet adhesion containing continuous pore systems through which liquid is supplied to the contact interfaces. Synergistic interaction of capillarity and humidity-induced pad softening increases the pull-off force and the work of adhesion by two orders of magnitude. This increase and the independence of pull-off force on the applied load are caused by the capillarity-supported formation of solid-solid contact between pad and the surface. Solid-solid contact dominates adhesion at high humidity and capillarity at low humidity. At low humidity, the work of adhesion strongly depends on the amount of liquid deposited on the surface and, therefore, on contact duration. These results may pave the way for the design of insect-inspired adhesive pads.
许多昆虫物种通过结合接触分裂（通过纤维状接触元件形成接触）和湿粘附（通过昆虫足部的孔供应液体分泌物）来可逆地附着在表面上。在此，我们制造了受昆虫启发的用于湿粘附的纤维垫，其包含连续的孔系统，通过该系统将液体供应到接触界面。毛细作用和湿度诱导的垫软化的协同相互作用使拉脱力和粘附功增加了两个数量级。这种增加以及拉脱力对施加负载的独立性是由毛细作用支持的垫与表面之间的固 - 固接触形成所导致的。在高湿度下，固 - 固接触主导粘附；在低湿度下，毛细作用主导。在低湿度下，粘附功强烈依赖于沉积在表面上的液体量，因此依赖于接触持续时间。这些结果可能为受昆虫启发的粘附垫的设计铺平道路。
