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  • Title: Enhanced adhesion by gecko-inspired hierarchical fibrillar adhesives.
    Author: Murphy MP, Kim S, Sitti M.
    Journal: ACS Appl Mater Interfaces; 2009 Apr; 1(4):849-55. PubMed ID: 20356011.
    Abstract:
    The complex structures that allow geckos to repeatably adhere to surfaces consist of multilevel branching fibers with specialized tips. We present a novel technique for fabricating similar multilevel structures from polymer materials and demonstrate the fabrication of arrays of two- and three-level structures, wherein each level terminates in flat mushroom-type tips. Adhesion experiments are conducted on two-level fiber arrays on a 12-mm-diameter glass hemisphere, which exhibit both increased adhesion and interface toughness over one-level fiber samples and unstructured control samples. These adhesion enhancements are the result of increased surface conformation as well as increased extension during detachment.
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