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Anisotropic Adhesion of Micropillars with Spatula Pads
Seo, Seungwan,Lee, Jehong,Kim, Kwang-Seop,Ko, Kwang Hee,Lee, Jong Hyun,Lee, Jongho American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.3
<P>Natural gecko adhesive structures consisting of angled setae, branched into thin spatulas, have remarkable properties including easily attachable and releasable anisotropic adhesion. The geometrically asymmetric structures lead to anisotropic adhesive properties. Inspired by the gecko, we fabricated an array of micropillars with asymmetric spatula pads from elastomeric materials. This paper describes the anisotropic properties of the micropillars with spatula pads as established by experimental measurements and observation together with finite element analysis. The results indicate that the structural difference of the spatula pad at one edge of the micropillar provides the anisotropic adhesive properties.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-3/am4044135/production/images/medium/am-2013-044135_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4044135'>ACS Electronic Supporting Info</A></P>