Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Molecular Nanostructures and Solids
MO 11.8: Vortrag
Mittwoch, 8. März 2017, 16:15–16:30, N 25
Casimir glue: Strong van der Waals adhesion of a polymer film on rough substrates — Juliane Klatt1, Pablo Barcellona1, Robert Bennett1, Olga Bokareva2, Hagen Feth3, Andreas Rasch3, Patrick Reith3, and •Stefan Yoshi Buhmann1,4 — 1Institute of Physics, University of Freiburg, Germany — 2Institute of Physics, University of Rostock, Germany — 3TrueDyne Sensors AG, Reinach, Switzerland — 4Freiburg Institute for Advanced Studies, Germany
Casimir-van der Waals dispersion forces have been shown to be responsible for the ability of geckoes to stick to very smooth and dry surfaces [1]. The effect has since lead to the fabrication of a biomimetic sticky tape [2]. Inspired by these developments, we propose that chemically inert and mechanically flexible polymeric films can enhance van der Waals forces in a similar way.
For the van der Waals adhesion of an ethylene-chlorotrifluoroethylene film on rough metal and dielectric substrates, we present a model that combines microscopic quantum-chemistry simulations of the polymer response functions and the equilibrium monomer–substrate distance with a macroscopic quantum-electrodynamics calculation of the Casimir force between the polymer film and the substrate. We predict adhesive forces up to 2.3 kN/mm2, where the effect is reduced by substrate roughness and for dielectric surfaces.
[1] K. Autumn et al., Proc. Natl. Acad. Sci. USA 99, 12252 (2002).
[2] A. K. Geim et al., Nature Materials 2, 461 (2003).