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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 29 January 2009
(at 13:00 in room 115, Hallwachsstr. 3)
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Single-asperity mechanics: Nanoscale friction and plasticity

Roland Bennewitz

Program Division for Nanotribology
Leibniz Institute for New Materials, Saarbrücken

Friction is a very complex phenomenon: The sliding motion of surfaces in contact involves the continuous formation, deformation, and rupture of a multitude of microscopic contacts. With the invention of Friction Force Microscopy it became feasible to study these microscopic single-asperity contacts one by one. I will present some fundamental results on friction on the molecular scale. These will include a fascinating difference in friction between single layer and bilayer graphene grown epitaxially on SiC, which we compare to differences in the angle-resolved photoemission results. I will also discuss results on the incipient stages of plasticity in single crystals. Force microscopy not only detects the nucleation of single dislocations as a force drop during indentation, it also can image the corresponding structures at the surface, sometimes with atomic resolution.

slides (pdf)

Invited by G. Cuniberti (nanoSeminar)

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