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2 Aug 2010

Volume 97, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 97, 051101 (2010); http://dx.doi.org/10.1063/1.3470591 (3 pages)

Pascal Böhi, Max F. Riedel, Theodor W. Hänsch, and Philipp Treutlein
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Effect of fibril shape on adhesive properties

Daniel Soto, Ginel Hill, Aaron Parness, Noé Esparza, Mark Cutkosky, and Tom Kenny

Appl. Phys. Lett. 97, 053701 (2010); http://dx.doi.org/10.1063/1.3464553 (3 pages) | Cited 4 times

Online Publication Date: 2 August 2010

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Research into the gecko’s adhesive system revealed a unique architecture for adhesives using tiny hairs. By using a stiff material (β-keratin) to create a highly structured adhesive, the gecko’s system demonstrates properties not seen in traditional pressure-sensitive adhesives which use a soft, unstructured planar layer. In contrast to pressure sensitive adhesives, the gecko adhesive displays frictional adhesion, in which increased shear force allows it to withstand higher normal loads. Synthetic fibrillar adhesives have been fabricated but not all demonstrate this frictional adhesion property. Here we report the dual-axis force testing of single silicone rubber pillars from synthetic adhesive arrays. We find that the shape of the adhesive pillar dictates whether frictional adhesion or pressure-sensitive behavior is observed. This work suggests that both types of behavior can be achieved with structures much larger than gecko terminal structures. It also indicates that subtle differences in the shape of these pillars can significantly influence their properties.
Show PACS
68.35.Np Adhesion
46.55.+d Tribology and mechanical contacts
82.35.Gh Polymers on surfaces; adhesion
89.20.Kk Engineering
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