Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements
Evidence for capillarity contributions to gecko adhesion from single spatula nanomechanical measurements
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DOI：
10.1073/pnas.0506328102
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发表时间：
2005-11-08
影响因子：
11.1
通讯作者：
Arzt, E
中科院分区：
文献类型：
--
作者：
Huber, G;Mantz, H;Arzt, E
壁虎脚趾上的毛状附着系统，在壁虎的例子中由10亿个铲子组成[Ruibal，R.&Ernst，V.(1965)J.Morphol]。117,271-294]，使其几乎可以附着在所有表面形貌上。壁虎粘连的机制基础已经被深入研究，但最低的等级，即铲子的等级，直到最近才进入实验阶段。这份报告详细测量了在不同的大气条件和表面化学条件下，单个壁虎铲施加的粘附力。通过对基材的合理选择和修改，将短程和长程粘附力分开。与以前的工作不同，[Ausem，K.，Sitti，M.，梁，Y.C.A.，Peattie，A.M.，Hansen，W.R.，Sporberg，S.，Kenny，T.W.，Fearing，R.，Israachvili，J.N.&Full，R.J.(2002)Proc.纳蒂。阿卡德。SCI。美国99,12252-12256]，我们的测量清楚地表明，湿度在纳米水平上显著影响壁虎的粘附性。这些发现对人工仿生附着系统的发展至关重要。
The hairy attachment system on a gecko's toes, consisting of one billion spatulae in the case of Gekko gecko [Ruibal, R. & Ernst, V. (1965) J. Morphol. 117, 271-294], allows it to adhere to nearly all surface topographies. The mechanistic basis for gecko adhesion has been intensely investigated, but the lowest hierarchical level, that of the spatula, has become experimentally accessible only recently. This report details measurements of the adhesion force exerted by a single gecko spatula for various atmospheric conditions and surface chemistries. Through judicious choice and modification of substrates, the short- and long-range adhesive forces are separated. In contrast to previous work [Autumn, K., Sitti, M., Liang, Y. C. A., Peattie, A. M., Hansen, W. R., Sporberg, S., Kenny, T. W., Fearing, R., Israelachvili, J. N. & Full, R. J. (2002) Proc. Nati. Acad. Sci. USA 99, 12252-12256], our measurements clearly show that humidity contributes significantly to gecko adhesion on a nanoscopic level. These findings are crucial for the development of artificial biomimetic attachment systems.