Wet but not slippery: boundary friction in tree frog adhesive toe pads
Wet but not slippery: boundary friction in tree frog adhesive toe pads
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DOI：
10.1098/rsif.2006.0135
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发表时间：
2006-10-22
影响因子：
3.9
通讯作者：
Smith, J. M.
中科院分区：
文献类型：
--
作者：
Federle, W.;Barnes, W. J. P.;Smith, J. M.
树蛙是显着的能力，坚持光滑的表面使用大脚趾垫。树蛙趾垫的粘性皮肤的特征是由钉钉镶嵌的六边形细胞组成，这些细胞被粘液腺打开的深通道隔开。垫被含水粘液完全润湿，这使得先前的作者认为，附着仅是由于垫和基底之间的流体填充接头产生的毛细管力和粘性力。在这里，我们提供了来自单趾力测量、垫粘液的激光镊子显微流变学测量和蓝腹滨鹬接触区的干涉反射显微镜的证据，表明树蛙的附着力因垫表皮和基底之间的密切接触和边界摩擦而显着增强，并由高度规则的垫微观结构促进。
Tree frogs are remarkable for their capacity to cling to smooth surfaces using large toe pads. The adhesive skin of tree frog toe pads is characterized by peg-studded hexagonal cells separated by deep channels into which mucus glands open. The pads are completely wetted with watery mucus, which led previous authors to suggest that attachment is solely due to capillary and viscous forces generated by the fluid-filled joint between the pad and the substrate. Here, we present evidence from single-toe force measurements, laser tweezer microrheometry of pad mucus and interference reflection microscopy of the contact zone in Litoria caerulea, that tree frog attachment forces are significantly enhanced by close contacts and boundary friction between the pad epidermis and the substrate, facilitated by the highly regular pad microstructure.