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Author: Kroner, Elmar × DDC: 530 × Version: publishedVersion × Subject: adhesion ×

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    A study of the adhesive foot of the gecko: Translation of a publication by Franz Weitlaner
    (Milton Park : Taylor & Francis, 2015) Kroner, Elmar; Davis, Chelsea S.
    In recent years, hundreds of scientific studies have been published regarding gecko-inspired adhesives. The primary reason for this increasing interest lies in the unique properties which are combined in the adhesive system of the gecko: this natural system can quickly and repeatedly adhere to different surface chemistry and roughness without the use of adhesion-mediating fluids. Although these properties seem to be inconspicuous at first, there is no man-made system currently available which successfully combines all of these properties and competes with the biological adhesive system. However, there are many applications which may benefit from an artificial adhesion system inspired by geckos, ranging from climbing robots and handling systems to biomedical patches and household objects.
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    Hierarchical macroscopic fibrillar adhesives: in situ study of buckling and adhesion mechanisms on wavy substrates
    (Bristol : IOP Publishing, 2015) Bauer, Christina T; Kroner, Elmar; Fleck, Norman A; Arzt, Eduard
    Nature uses hierarchical fibrillar structures to mediate temporary adhesion to arbitrary substrates. Such structures provide high compliance such that the flat fibril tips can be better positioned with respect to asperities of a wavy rough substrate. We investigated the buckling and adhesion of hierarchically structured adhesives in contact with flat smooth, flat rough and wavy rough substrates. A macroscopic model for the structural adhesive was fabricated by molding polydimethylsiloxane into pillars of diameter in the range of 0.3–4.8 mm, with up to three different hierarchy levels. Both flat-ended and mushroom-shaped hierarchical samples buckled at preloads one quarter that of the single level structures. We explain this behavior by a change in the buckling mode; buckling leads to a loss of contact and diminishes adhesion. Our results indicate that hierarchical structures can have a strong influence on the degree of adhesion on both flat and wavy substrates. Strategies are discussed that achieve highly compliant substrates which adhere to rough substrates.