2013
DOI: 10.1103/physrevb.87.045412
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High-pressure lubricity at the meso- and nanoscale

Abstract: The increase of sliding friction upon increasing load is a classic in the macroscopic world. Here we discuss the possibility that friction rise might sometimes turn into a drop when, at the mesoscale and nanoscale, a confined lubricant film separating crystalline sliders undergoes strong layering and solidification. Under pressure, transitions from N to N-1 layers may imply a change of lateral periodicity of the crystallized lubricant sufficient to alter the matching of crystal structures, influencing the ensu… Show more

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Cited by 14 publications
(14 citation statements)
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“…21 Canonical ensemble configurations were sampled by means of a Langevin thermostat directly applied to the lubricant molecules. As in previous MD simulations, 22 under similar operative conditions, the details of the adopted dissipation scheme are not expected to change the essence of the system response. The plates were treated as rigid bodies, the lower one fixed and the upper one either subjected to a z-directed force F n (the load) as shown in Fig.…”
Section: Model and Simulation Geometrymentioning
confidence: 71%
“…21 Canonical ensemble configurations were sampled by means of a Langevin thermostat directly applied to the lubricant molecules. As in previous MD simulations, 22 under similar operative conditions, the details of the adopted dissipation scheme are not expected to change the essence of the system response. The plates were treated as rigid bodies, the lower one fixed and the upper one either subjected to a z-directed force F n (the load) as shown in Fig.…”
Section: Model and Simulation Geometrymentioning
confidence: 71%
“…This explains the variation of stick-slip periodicity and amplitude with applied normal pressure, namely with higher pressure, the system is less compliant, so the stick-slip is less obvious. Interestingly, a high pressure lubricity has been recently reported for confined Lennard-Jones lubricant film 35 . The friction decrease of lubricant confined between crystalline sliders with increasing pressure is attributed to two factors: (1) High friction with bulk lubricant shear, easier at low pressure and low density, could disappear after relayering when density is higher; (2) Formation of incommensurate slider-lubricant interfacial sliding interface 35 .…”
Section: Resultsmentioning
confidence: 99%
“…Interestingly, a high pressure lubricity has been recently reported for confined Lennard-Jones lubricant film35. The friction decrease of lubricant confined between crystalline sliders with increasing pressure is attributed to two factors: (1) High friction with bulk lubricant shear, easier at low pressure and low density, could disappear after relayering when density is higher; (2) Formation of incommensurate slider-lubricant interfacial sliding interface35. It should be mentioned that lubricity of materials in sliding contact has also been attributed to velocity weakening36, flash heating or melting3738.…”
Section: Resultsmentioning
confidence: 99%
“…The findings reported here concern systems with macroscopic particles. An intriguing point and very stimulating issue is whether similar phase diagrams can characterize lubrication of systems at smaller scales (Vanossi et al 2013b(Vanossi et al , 2013a, such as colloids, liquid crystals, and atoms, or could be relevant for lubrication of biological systems such as membranes, joints or surfaces. On the other hand, further investigation on granular systems can shed light on the main mechanisms at the base of the observed behavior, discriminating among, e.g.…”
Section: Summary and Some Perspectivesmentioning
confidence: 99%