Boundary lubrication: layering transition for curved solid surfaces with long-range elasticity
Section snippets
Incommensurate layer (unpinned)
Fig. 2A shows the average perpendicular stress acting on the substrate as a function of the displacement d (with the velocity of the block towards the substrate, for two different temperatures, and 300 K, where (for clarity) the latter curve is displaced towards negative pressure by 0.2 GPa. The block and the substrate are initially separated by about four Xe-monolayers. The three “bumps” on the curves correspond to the layering transitions (with increasing pressure) and
Incommensurate layer (pinned)
Fig. 2B shows the average perpendicular stress acting on the substrate (or block) as a function of the displacement of the block towards the substrate. The block and the substrate are initially separated by about four Xe-monolayers. Calculations are presented for the squeeze velocity The upper curve (a) is without lateral sliding (vx=0) while the lower curve (b) is for For clarity the latter curve is displaced towards negative pressure by 0.2 GPa. Note that in contrast to
Commensurate layer
Fig. 2C shows the average perpendicular stress acting on the substrate (or block) as a function of the displacement of the block towards the substrate. The block and the substrate are initially separated by about four Xe-monolayers. Calculations are presented for the squeeze velocity The upper curve (a) is without lateral sliding (vx=0) while the lower curve (b) is for Note that the commensurate (1×1) adsorbate layers are strongly pinned, and even though the Xe–substrate
Acknowledgements
B.P. thanks BMBF for a grant related to the German–Israeli Project Cooperation “Novel Tribological Strategies from the Nano- to Meso-Scales.” He also thanks F. Mugele and M. Salmeron for interesting discussions.
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