Abstract
Molecular dynamics (MD) and related simulation techniques are powerful tools for improving our understanding of nanotribology. In simulations, materials properties and boundary conditions can be varied at will, and the resulting changes in both macroscopic variables and the dynamics of individual atoms can be observed. This allows one to study systematically the effects of many different factors on friction and wear at the nano-scale. Some examples that are considered in this chapter are (i) the symmetry of contacting surfaces (disordered vs. crystalline and with or without common periods), (ii) surface elasticity, (iii) surface curvature or topology, (iv) interfacial adhesion, and (v) lubricant and/or contaminant molecules present at the interface. Results from simulations and experiments on isolated nano-scale contacts often contradict our experience from macroscopic systems. Kinetic friction coefficients can be orders of magnitude smaller than those observed in macroscopic experiments. Detailed calculations even suggest that there should be no static friction between most pairs of clean, chemically passivated surfaces unless the load is large enough to produce wear. Simulations that test a series of possible mechanisms for static friction are described. Geometrical interlocking can produce static friction in contacts containing only a few atoms, such as an atomic force microscope tip. Larger contacts only exhibit static friction when there is wear, or when the surfaces are separated by a glassy contaminant layer that locks them together. Most surfaces are coated by such films and they are shown to yield friction forces that agree with both nanoscale and macroscopic experiments.
Abbreviations
- AFM:
-
atomic force microscope/microscopy
- EAM:
-
embedded atom method
- MD:
-
molecular dynamics
- QCM:
-
quartz-crystal microbalance
- SFA:
-
surface forces apparatus
- UHV:
-
ultrahigh vacuum
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Müser, M.H., Robbins, M.O. (2004). Atomistic Computer Simulations of Nanotribology. In: Bhushan, B. (eds) Springer Handbook of Nanotechnology. Springer Handbooks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-29838-X_23
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