Abstract:
In this talk, I will discuss some recent results of our
theoretical modelling of rolling friction at the nanoscale. The system
studied is a single nanoparticle placed between two surfaces, one
stationary and the other pulled at a constant velocity and pressed down by a
normal load. This system, although simple, can exhibit non-trivial and
counterintuitive behaviour. It can exist in three principle friction
states, viz. the rolling state, superlubric state of practically zero friction,
and the high-friction state. The nature of these friction regimes will be
examined, the state diagram will be presented, and various switching and
hysteresis effects will be predicted and explained.
http: //www.physik.uni-bielefeld.de/theory/cm/people/members/mevstign.html
http: //www.physik.uni-bielefeld.de/~mykhaylo/publications.html