Abstract
Micropillar adhesives have gained increasing attention because they generate high pull-off forces. The generation of high friction, however, has been proven difficult with such geometries, because micropillars tend to buckle under shear loading. Here, we fabricated orthogonal arrays of composite poly-dimethoxysiloxane (PDMS) micropillars with a stiff core and spin-coated them with PDMS solutions to form a soft coating, as well as bridges between neighboring micropillars. We used 10 wt% and 5 wt% PDMS solution to obtain thick or thin bridges, respectively. The micropillars had an average height of about 60 µm and a diameter of 40 µm. Adhesion and friction measurements were performed with three types of adhesives (i.e., without bridges and with either thin or thick bridges) as well as unpatterned samples as reference, on stiff glass substrates and on deformable PDMS substrates. We found that, on PDMS substrates, bridging resulted in increased friction, compared to non-bridged micropillars. Friction increased with increasing bridge thickness, presumably due to buckling prevention. The adhesives were also subjected to 99 repeating friction cycles to test the effect of micropillar bridging on the durability of the adhesives. The results showed that adhesives with thick micropillar bridges preserved their friction performance over the cycles, whereas adhesives with no bridges or thin bridges exhibited a gradual decay of friction.
Highlights
Pressure-sensitive adhesives can be detached and reattached only a limited number of times because they tend to be gradually fouled with dust and other particles
Opposite to pressure-sensitive adhesives that employ some type of glue, gecko adhesion is ‘dry’, relying on Van der Waals forces [1]
Gecko adhesion relies on the fine-structure on the gecko toepads, which consists of arrays of microscale fibrils, each of which branches into nanoscale spatulas [1, 2]
Summary
Pressure-sensitive adhesives can be detached and reattached only a limited number of times because they tend to be gradually fouled with dust and other particles. Gecko-inspired adhesives have been being developed as an attractive alternative of pressure-sensitive adhesives that can detach and reattach multiple times without deterioration of their adhesive performance. Gecko adhesion relies on the fine-structure on the gecko toepads, which consists of arrays of microscale fibrils, each of which branches into nanoscale spatulas [1, 2]. This fibrillary structure makes the gecko toepads soft and deformable at various scales [3], resulting in the formation of a large contact area [4, 5]. When attached to a tilted or vertical substrate, the fibrils are loaded in their stiff tensile direction, preventing deformations that could lead to loss of the formed contact [3]
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