Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: Nanotribology

O 84.5: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, WIL B321

Scaling laws of friction: Area, time and temperature — •Dirk Dietzel, Michael Feldmann, and Andrè Schirmeisen — Institute of Applied Physics, Justus Liebig University Giessen, Germany

The investigation of friction by AFM assisted nanoparticle manipulation has presented itself as a very useful approach to gain insight into tribological processes of extended nano- and mesocontacts. Currently, this approach is utilized to analyze the significance of dynamic processes at the interface formed between particles and substrates. Our studies reveal that some experiments, like the contact area dependence of friction, can be explained by purely structural considerations of rigid interfaces, whereas other experiments, like the combined velocity and temperature dependence of interfacial friction, highlight the importance of dynamic interface processes, i.e. contact ageing and thermal activation. Comparing these experiments thus sheds a light on the validity of assuming rigid interfaces, with possible ramifications on the concept of structural lubricity. Additionally, we will show how measuring stick slip during nanoparticle sliding can be viable route to further analyze interface processes.