Frictional Duality Observed during Nanoparticle Sliding

Details Frictional Duality Observed during Nanoparticle Sliding Frictional Duality Observed during Nanoparticle Sliding

2008-05-16

arxiv.org/abs/0805.2448v2

Physics

Condensed Matter

Materials Science

revised version

Scientific paper

10.1103/PhysRevLett.101.125505

One of the most fundamental questions in tribology concerns the area dependence of friction at the nanoscale. Here, experiments are presented where the frictional resistance of nanoparticles is measured by pushing them with the tip of an atomic force microscope. We find two coexisting frictional states: While some particles show finite friction increasing linearly with the interface areas of up to 310,000nm^2, other particles assume a state of frictionless sliding. The results further suggest a link between the degree of surface contamination and the occurrence of this duality.

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