Bio-inspired micro- and nanostructures are emerging as novel dry adhesives owing to their high aspect ratio micropillar structure, resulting in collective van der Waals attraction between the adhesive and the substrate. Specifically, gecko-inspired structures exhibit great adhesive properties on smooth surfaces; however, the pull-off strength of micropillars in gecko-inspired surfaces can be decreased by applying a preloading force. Therefore, octopus suckers or suction cup-like structures have been considered as alternative microstructures providing high adhesion force. The fabrication of both microsuckers and micropillar structures is complicated and requires sophisticated control of the microstructure using photolithography and sequential polymer-based replica molding. Therefore, in this study, a fabrication method for octopus-like and suction cup-like micropatterns on polymer matrix is suggested by simple replica molding using a single master wafer. The relationship between the total adhesion force and the effective surface area of micropatterns was established and calculated by summing the preloading force, the suction force in the normal direction, and the shear force induced by van der Waals attraction. The results of adhesion force measurement and the repeatability test show that the micropatches with square microholes have high adhesion force (16 N/cm 2 ) and good repeatability of attachments/detachments over 100 cycles.

中文翻译：

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各种形状微吸盘干式粘合剂的制作方法

仿生微纳米结构由于其高纵横比微柱结构而成为新型干粘合剂，导致粘合剂和基材之间的集体范德华吸引力。具体来说，受壁虎启发的结构在光滑的表面上表现出很好的粘合性能；然而，通过施加预加载力可以降低壁虎表面中微柱的拉拔强度。因此，章鱼吸盘或吸盘状结构被认为是提供高粘附力的替代微结构。微型吸盘和微柱结构的制造都很复杂，需要使用光刻和基于聚合物的连续复制成型对微观结构进行精密控制。因此，在本研究中，通过使用单个主晶片的简单复制成型，建议了一种在聚合物基质上制作章鱼状和吸盘状微图案的制造方法。通过将预加载力、法向吸力和范德华引力引起的剪切力相加，建立和计算总粘附力与微图案有效表面积之间的关系。粘附力测量和重复性测试结果表明，具有方形微孔的微贴片具有高粘附力（16 N/cm 2 ）和良好的附着/分离重复性，超过100次循环。通过将预加载力、法向吸力和范德华引力引起的剪切力相加，建立和计算总粘附力与微图案有效表面积之间的关系。粘附力测量和重复性测试结果表明，具有方形微孔的微贴片具有高粘附力（16 N/cm 2 ）和良好的附着/分离重复性超过100次循环。通过将预加载力、法向吸力和范德华引力引起的剪切力相加，建立和计算总粘附力与微图案有效表面积之间的关系。粘附力测量和重复性测试结果表明，具有方形微孔的微贴片具有高粘附力（16 N/cm 2 ）和良好的附着/分离重复性，超过100次循环。