College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, People's Republic of, China.
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, People's Republic of, China
J R Soc Interface. 2018 Nov 14;15(148):20180681. doi: 10.1098/rsif.2018.0681.
Inspired by biological topographical surfaces, micropatterned elastomeric surfaces with square pillars and dimples of different geometry scales were fabricated. Their wettability and adhesion properties with various liquids were systematically investigated and compared with flat surfaces. Interesting results were obtained in the case of silicone oil (the toe-pad-like wetting case) in that the scale-dependent wettability and adhesion performed inversely for pillars and dimples. Micropillars significantly enhanced the surface wettability with a geometry scale dependence, whereas the dimples suppressed the wettability independent of the geometry scale. The adhesion force of the micropillars increased with an increase of the geometry scale. However, in the case of the micro-dimples, the adhesion force obviously decreased with an increase of the geometry scale. This behaviour was attributed to the fact that pillars are 'open' to oil but dimples are 'close' to oil, presenting different orientations to the solid-liquid interface.
受生物形貌表面启发，制备了具有不同几何尺度方柱和凹坑的微图案弹性体表面。系统研究了它们与各种液体的润湿性和粘附特性，并与平面进行了比较。有趣的结果出现在硅油（类似趾垫的润湿情况）的情况下，对于方柱和凹坑，尺度相关的润湿性和粘附性表现相反。微柱显著提高了表面润湿性，具有几何尺度依赖性，而凹坑则不依赖于几何尺度抑制了润湿性。微柱的粘附力随着几何尺度的增加而增加。然而，在微凹坑的情况下，粘附力随着几何尺度的增加而明显减小。这种行为归因于这样一个事实，即柱子“对油开放”，但凹坑“对油封闭”，呈现出不同的固体-液体界面取向。
