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O: Fachverband Oberflächenphysik

O 38: [DS] Progress in Micro- and Nanopatterning: Techniques and Applications II (Focused Session, jointly with O - Organisers: Graaf, Hartmann)

O 38.3: Vortrag

Mittwoch, 16. März 2011, 11:30–11:45, GER 38

Artificial Hierarchical Gecko-mimicking Structures — •Michael Röhrig, Alexander Kolew, Fabian Pfannes, Matthias Worgull, and Hendrik Hölscher — Institute for Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT), Germany

Geckos have an impressive attachment system that makes them able to climb on nearly every surface. Like various other mechanisms developed by nature, the gecko effect is strongly connected to the structuring of surfaces. The toes of the Tokay Gecko for example are divided into several lamellae which are covered with millions of setae, delicate hairs which are about 100  µ m in height and 4  µ m in diameter. The setae branch into hundreds of tiny endings, the so called spatulae. Thus the gecko is capable of achieving intimate contact with smooth and rough surfaces which leads to a strong adhesion due to intermolecular forces, in particular van der Waals forces.

Mimicking these micro- and nanostructures leads to artificial dry attachment systems. Hot embossing is a well-suited molding technique to fabricate such biomimetic structures. In this talk a new variation of hot embossing, the so called hot pulling will be presented. Hot pulling allows the fabrication of fibrillar, gecko-mimicking surfaces. Beyond that, the method of measuring the adhesion of structures via AFM force distance curves by using spherical tips will be depicted.