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O: Fachverband Oberflächenphysik
O 69: Tribology: Surfaces and Nanostructures (joint session O/CPP)
O 69.3: Vortrag
Mittwoch, 18. März 2020, 15:30–15:45, GER 37
Stick-slip and surface rippling in plastic and abrasive wear on the nanoscale — •Enrico Gnecco1, Jana Hennig1, and Juan Mazo2 — 1Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Jena, Germany — 2Department of Condensed Matter Physics, University of Zaragoza, Zaragoza, Spain
The formation of regular surface structures as a result of plastic and abrasive wear processes is a general but scarcely understood phenomenon. Here we will discuss this topic with the examples of polymer [1] and silica glass surfaces [2] scratched by silicon and diamond nano- and microtips respectively. In spite of the different nature of the nanoscopic wear mechanisms, quasi-periodic ripple patterns are formed in both cases. The physical interpretation of the observed structures relies on the time evolution of the friction forces acting in the stick-slip motion of the tip, which is simultaneously indented and elastically pulled along the surfaces in order to scratch them. The geometric shapes of the surface structures as well as their dependence on the scan velocity are consequently reproduced by solving the corresponding equations of motion of the tips in an evolving energy landscape.
[1] J.J. Mazo et al., Phys. Rev. Lett. 122 (2019) 256101 [2] E. Gnecco et al., Phys. Rev. Materials 2 (2018) 115601