Nanoscale design of snake skin for reptation locomotions via friction anisotropy
Nanoscale design of snake skin for reptation locomotions via friction anisotropy
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DOI：
10.1016/s0021-9290(99)00013-5
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发表时间：
1999-05-01
影响因子：
2.4
通讯作者：
Tsukruk, VV
中科院分区：
文献类型：
--
作者：
Hazel, J;Stone, M;Tsukruk, VV
利用多模式扫描探针显微镜对三种蛇类皮肤样品的纳米结构进行了研究。描述了复杂的摩擦改性纳米结构。这些包括有序的微纤维阵列，其可用于实现使命适应性摩擦特性。由“双脊”纳米级微原纤几何形状引起的接触区域中的粘合力的显著降低为以最小的粘合力和摩擦在向前方向上滑动提供了理想的条件。这些局部接触点中的低表面粘附性可以减少局部磨损和环境碎片对皮肤的污染。曲率半径为20-40 nm的微纤维末端的高度不对称的“爪状”轮廓在前后运动中引起摩擦各向异性，并用作向后运动的有效止动器，从而保持向前运动的低摩擦。穿透蛇皮的连续微孔系统可以用作润滑/抗粘附脂质混合物的递送系统，其提供蛇皮的边界润滑。(C)1999 Elsevier Science Ltd.保留所有权利。
Multi-mode scanning probe microscopy is employed to investigate the nanostructure of dermal samples from three types of snakes. Sophisticated friction modifying nanostructures are described. These include an ordered microfibrillar array that can function to achieve mission adaptable friction characteristics. Significant reduction of adhesive forces in the contact areas caused by the 'double-ridge' nanoscale microfibrillar geometry provides ideal conditions for sliding in forward direction with minimum adhesive forces and friction. Low surface adhesion in these local contact points may reduce local wear and skin contamination by environmental debris. The highly asymmetric, 'pawl-like' profile of the microfibrillar ends with radius of curvature 20-40 nm induces friction anisotropy in forward-backward motions and serves as an effective stopper for backward motion preserving low friction for forward motion. The system of continuous micropores penetrating through the snake skin may serve as a delivery system for lubrication/anti-adhesive lipid mixture that provides for boundary lubrication of snake skins. (C) 1999 Elsevier Science Ltd. All rights reserved.