Microscopic Friction Studies on Metal Surfaces.
(pp. 19 - 24).
Atomically flat and clean metal surfaces exhibit a regime of ultra-low friction at low normal loads. Atomic force microscopy, performed in ultra-high vacuum on Cu(100) and Au(111) surfaces, reveals a clear stick-slip modulation in the lateral force but almost zero dissipation. Significant friction is observed only for higher loads (similar to 4-6 nN above the pull-off force) together with the onset of wear. We discuss the minor role of thermal activation in the low friction regime and suggest that a compliant metallic neck between tip and surface is formed which brings upon the low, load-independent shear stress.
|Title:||Microscopic Friction Studies on Metal Surfaces|
|Event:||428th Wilhelm and Else Heraeus Seminar on Physics of Tribology - Understanding Friction and Wear in Technical Systems|
|Location:||Bad Honnef, GERMANY|
|Dates:||2009-03-23 - 2009-03-25|
|Keywords:||Nanotribology, Stick-slip, Atomic force microscopy (AFM), ATOMIC-SCALE FRICTION, SLIDING FRICTION, TRIBOLOGY, NANOINDENTATION, CONTACT, AU(111), MEMS|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry|
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