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O: Fachverband Oberflächenphysik

O 38: Poster Session III: Tribology: Surfaces and nanostructures I

O 38.2: Poster

Tuesday, March 2, 2021, 10:30–12:30, P

Temperature dependence of friction anisotropy on crystalline materials — •Jennifer Konrad, Dirk Dietzel, and Andre Schirmeisen — Institute of Applied Physics, University of Giessen, 35392 Giessen, Germany

On the nanoscale, the dependence of the friction force on the sliding direction is a well-known phenomenon. This anisotropy occurs as a consequence of the surface structure and is related to different energy barrier heights along different directions of the sample surface. If the sample temperature is varied, the friction force as deduced from the thermally activated Prandtl Tomlinson model is expected to change, with direct influence on the stability of the different sliding directions. In this work, the directional friction force is now analyzed under UHV conditions as a function of temperature on different crystalline materials. Our results show that the both the absolute friction and the anisotropy are not only influenced by temperature itself but also reflect temperature dependent wear effects which ultimately eliminate any frictional anisotropy.