Interaction potential and hopping dynamics governing sliding friction

2020-01-04 13:55:06

potential force friction atomic hopping

责任者: Riedo, E.;Gnecco, E.;Bennewitz, R.;Meyer, E.;Brune, H. 单位: Ecole Polytechnique Fed. de Lausanne, Inst. de Phys. des Nanostructures, Lausanne, Switzerland 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2003/08/22,91(8):084502-1 摘要: The friction force on a nanometer-sized tip sliding on a surface is related to the thermally activated hopping of the contact atoms on an effective atomic interaction potential. A general analytical expression relates the height of this potential and the hopping attempt frequency to measurements of the velocity dependence of the friction force performed with an atomic force microscope. While the height of the potential is roughly proportional to the normal load, the attempt frequency falls in the range of mechanical eigenfrequencies of the probing tip in contact with the surface 关键词: atomic force microscopy;sliding friction;sliding friction;friction force;nanometer-sized tip;thermally activated hopping;effective atomic interaction potential;velocity dependence;atomic force microscope;attempt frequency