Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Nanotribology

O 9.1: Vortrag

Montag, 11. März 2013, 10:30–10:45, H42

The Interdependence of Timescale and Temperature on Nanoparticle Friction — •Michael Feldmann, Dirk Dietzel, and André Schirmeisen — Institut für Angewandte Physik, JLU Giessen, Germany

In the endeavor to understand friction for a broad range of contact area sizes, friction measurement employing nanoparticle manipulation has emerged as a valuable experimental technique [1]. While the friction of nanoscopic point-like contacts have already been widely examined, investigations of more extended contacts as realized by sliding nanoparticles have recently been intensified. Here we present a study of nanoparticle friction measurements conducted with an atomic force microscope (AFM) in UHV, examining the dependence of friction on temperature and velocity [2]. A strongly non-monotonic relation between friction and temperature/velocity is observed, which cannot be explained in terms of classical models of nanoscale friction. We therefore introduce a model based on the Prandtl-Tomlinson concept, including a characteristic time evolution of the contact energy barrier. The corresponding simulations are in very good agreement with the experimental findings including the non-monotonic temperature/velocity dependence.
Dietzel, D., Herding, C., Feldmann, M., Phys. Rev. B 82, 35401 (2010)
Feldmann, M., Dietzel, D., Schirmeisen, A., to be published