Results 41 to 50 of about 1,178 (193)
Rotational Instability in Superlubric Joints [PDF]
Physical Review Letters, 2019 Surface and interfacial energies play important roles in a number of instability phenomena in liquids and soft matters, but are rare to play a similar role in solids. Here we report a new type of mechanical instabilities that are controlled by surface and interfacial energies and are valid for a large class of materials, in particular two-dimensional ...
Cangyu, Qu +3 more
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The effect of temperature and velocity on superlubricity [PDF]
Journal of Physics: Condensed Matter, 2012 We study the effects of temperature and sliding velocity on superlubricity in numerical simulations of the Frenkel-Kontorova model. We show that resonant excitations of the phonons in an incommensurate sliding body lead to an effective friction and to thermal equilibrium with energy distributed over the internal degrees of freedom.
Ende, J.A. van den +2 more
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npj 2D Materials and Applications, 2021 Superlubricity has recently raised an increasing interest owing to its great potential in energy saving and environmental benefits. Yet how to obtain stable superlubricity under an ultrahigh contact pressure (>1 GPa) still remains a challenge.
Xiaoyong Ren +7 more
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Observation of Microscale Superlubricity in Graphite [PDF]
Physical Review Letters, 2012 Upon shearing a microscale lithographically defined graphite mesa, the sheared section retracts spontaneously to minimize interface energy. Here, we demonstrate a sixfold symmetry of the self-retraction and provide a first experimental estimate of the frictional force involved, as direct evidence that the self-retraction is due to superlubricity, where
Ze, Liu +8 more
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Friction, 2018 In thin-film lubrication (TFL), generally, the viscosity of the lubricant and its coefficient of friction (CoF) increase. Finding a method to reduce the CoF in TFL is a significant challenge for tribologists.
Xiangyu Ge +3 more
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Stability of superlubric sliding on graphite [PDF]
Physical Review E, 2010 Recent AFM experiments have shown that the low-friction sliding of incommensurate graphite flakes on graphite can be destroyed by torque-induced rotations. Here we theoretically investigate the stability of superlubric sliding against rotations of the flake. We find that the occurrence of superlubric motion critically depends on the physical parameters
Wijn, A.S. de, Fusco, C., Fasolino, A.
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Journal of Materials Research and TechnologyTo improve the tribological properties of polyurethane (PU) based water-lubricated bearings specifically under severe conditions, expanded graphite/paraffin (EG/paraffin) is synthesized as self-lubricating additives and incorporated into the polyurethane
Jiangbo Li +6 more
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Load and velocity boundaries of oil-based superlubricity using 1,3-diketone
Friction, 2023 The clarification of the critical operating conditions and the failure mechanism of superlubricity systems is of great significance for seeking appropriate applications in industry.
Yuyang Yuan +6 more
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Atomistics of superlubricity [PDF]
Friction, 2014 Abstract Friction is a phenomenon observed ubiquitously in daily life, yet its nature is complicated. Friction between rough surfaces is considered to arise primarily because of macroscopic roughness. In contrast, interatomic forces dominate between clean and smooth surfaces.
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, 2023 In this work, the lubricating performance of 1,3-diketone oil was tested on steel surfaces with roughness grades in three different orders of magnitude. The results indicate that 1,3-diketone achieved superlubricity on both the smooth engineering surface
Li, Jiayang +4 more
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