Superlubricity with nonaqueous liquid

As lubricating oils and greases are still the most widely used lubricants in practical mechanical systems like bearings or gears, superlubricity enabled by oils is expected to be employed in the existing application environments and operating conditions. However due to the limit of the viscosity, the minimum friction coefficient of conventional oil-based lubricants is typically around 0.01–0.05. In this chapter, a theoretical analysis of the challenge for oil-based superlubricity is introduced firstly; then it is the simulation work in this area mainly based on thin-film lubrication model; in the end, some typical experimentally obtained oil superlubricity systems through thin-film lubrication, hydrodynamic lubrication, boundary lubrication, and mixed lubrication regime are presented.