Sliding-induced adhesion of stiff polymer microfibre arrays. I. Macroscale behaviour
Sliding-induced adhesion of stiff polymer microfibre arrays. I. Macroscale behaviour
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DOI：
10.1098/rsif.2007.1308
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发表时间：
2008-08-06
影响因子：
3.9
通讯作者：
Fearing, Ronald S.
中科院分区：
文献类型：
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作者：
Lee, Jongho;Majidi, Carmel;Fearing, Ronald S.
壁虎启发的微纤维阵列与42万聚丙烯纤维cm（-2）（每根纤维的弹性模量为1 GPa，长度为20 mm，直径为0.6 mm）的制造和测试纯剪切载荷条件下，去除后的预载荷小于0.1 N cm（-2）。在滑动以接合纤维后，2 cm（2）贴片产生高达4 N的剪切力，估计接触区域为0.44 cm（2）。对照未原纤化表面没有可测量的剪切力。为了进行比较，在相同条件下在光滑玻璃上测试的天然刚毛贴片显示出每单位估计接触区域的剪切力约为7倍。与壁虎纤维阵列类似，合成贴片保持接触并增加滑动的剪切力。观察到的高剪切力（约210 nN/纤维）表明纤维处于侧面接触，提供了比通过尖端接触获得的更大的真实接触面积。剪切力增加的过程中反复测试合成补丁，这表明变形的纤维成更有利的构象。
Gecko-inspired microfibre arrays with 42 million polypropylene fibres cm(-2) (each fibre with elastic modulus 1 GPa, length 20 mm and diameter 0.6 mm) were fabricated and tested under pure shear loading conditions, after removing a preload of less than 0.1 N cm(-2). After sliding to engage fibres, 2 cm(2) patches developed up to 4 N of shear force with an estimated contact region of 0.44 cm(2). The control unfibrillated surface had no measurable shear force. For comparison, a natural setal patch tested under the same conditions on smooth glass showed approximately seven times greater shear per unit estimated contact region. Similar to gecko fibre arrays, the synthetic patch maintains contact and increases shear force with sliding. The high shear force observed (approx. 210 nN per fibre) suggests that fibres are in side contact, providing a larger true contact area than would be obtained by tip contact. Shear force increased over the course of repeated tests for synthetic patches, suggesting deformation of fibres into more favourable conformations.