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Microscopic Friction Studies on Metal Surfaces

Gosvami, NN; Filleter, T; Egberts, P; Bennewitz, R; (2010) Microscopic Friction Studies on Metal Surfaces. In: TRIBOLOGY LETTERS. (pp. 19 - 24). SPRINGER/PLENUM PUBLISHERS

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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.

Type:Proceedings paper
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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