Abstract
Geckos have attractive adhesive abilities such as anisotropic adhesion, self-cleaning, attaching to a variety of surfaces, and being able to use repeatedly, which inspired researchers to fabricate mimetic adhesive devices. Especially to get anisotropic adhesive properties, tilted micro-pillars and ones with spatula heads have been produced. Micro-pillars-shaped dry adhesive devices with asymmetric cross-sections, such as triangle, also have anisotropic adhesive properties. It is easier to be fabricated and expected to have higher productivity than other ways. However, the effect of cross-sectional shapes of micro-pillars on their adhesive properties is still unclear. In this study, micro-pillars arrays with a various cross-sections were fabricated. The effect of cross-sectional shapes of the micro-pillars on anisotropic adhesive properties is investigated by measuring adhesions and frictions of these adhesive devices.
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