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  • Title: Stochastic stick-slip nanoscale friction on oxide surfaces.
    Author: Craciun AD, Gallani JL, Rastei MV.
    Journal: Nanotechnology; 2016 Feb 05; 27(5):055402. PubMed ID: 26751769.
    Abstract:
    The force needed to move a nanometer-scale contact on various oxide surfaces has been studied using an atomic force microscope and theoretical modeling. Force-distance traces unveil a stick-slip movement with erratic slip events separated by several nanometers. A linear scaling of friction force with normal load along with low pull-off forces reveals dispersive adhesive interactions at the interface. We model our findings by considering a variable Lennard-Jones-like interaction potential, which accounts for slip-induced variation of the effective contact area. The model explains the formation and fluctuation of stick-slip phases and provides guidelines for predicting transitions from stick-slip to continuous sliding on oxide surfaces.
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