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O: Fachverband Oberflächenphysik
O 78: Nanostructures at Surfaces IV: Various Aspects
O 78.9: Vortrag
Donnerstag, 10. März 2016, 12:30–12:45, S052
Bioinspired dry adhesives from carbon nanotubes — •Christian Lutz1, Julia Syurik1, Sharali Malik2, Sergei Lebedkin2, and Hendrik Hölscher1 — 1Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology (KIT), 76344 Karlsruhe, Germany — 2Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
Geckos show amazing adhesive properties and are able to walk on walls and hanging on ceilings. Their adhesion force originates from nanostructures on their feet. Millions of hierarchical hairs contact the surface to generate van der Waals forces.
Mimicking the gecko structures can lead to artificial dry adhesives with a great range of applications (e.g. in robotics, medicine and space technology). While most dry adhesives are polymer-based and have benefits of easy fabrication routs and low cost production, they are not applicable at high temperatures and pressures. Carbon nanotubes (CNTs) are stable at high temperatures and, therefore, very promising as artificial adhesives for specific applications. Several scientific groups have already demonstrated dry adhesives from carbon nanotubes (CNTs). Which is due to their high aspect ratio the effective elastic modulus of the tips of CNTs is dropping below 100 kPa according to the contact splitting theory. Thus, for a free standing array of CNTs the resulting adhesive force depends on aspect ratio of CNTs and array density. In this work we analyse the relation between geometry of CNT arrays (i.e. diameter of CNTs, their height and density) and resulting pull-off force measured by AFM (force-distance curves).