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Mechanical parts that slide or roll against other parts should do so with low friction and should have a long life time. For transportation to achieve low energy consumption, reducing the friction coefficient between various mechanical parts in the engine, transmission, gears, and bearings is important. Carbonaceous coating such as Diamond-Like Carbon (DLC) are good candidates for reducing the friction coefficient in automobiles, since they have high hardness and a low friction coefficient (Kano et. al., 2005; Tasdemir et. al., 2013; Erdemir et. al., 2000; Donnet and Erdemir, 2004; Fontaine et. al., 2004). For sliding under lubrication, the gap between the two surfaces is determined by the surface roughness, normal load, sliding velocity, and the viscosity and temperature of the lubricant (Bowden and Tabor, 2001). Modern engine bearings are required to reduce the friction coefficient to low levels, so low-viscosity lubricants are used to reduce resistance to flow. However, using a low-viscosity lubricant result in direct solid contact between surfaces, which can disrupt the hydrodynamic lubrication and generate numerous wear particles. The particles are assumed to be abrasive; therefore, it is better to eliminate them from the contact region and from oil reservoirs. In general, these particles are thought to accelerate wear since they can scratch the surfaces, causing oil starvation by particle stagnation. In an automobile, it is common to trap the particles in an oil filter. The pore diameters of a conventional filter are around 50

Collecting micrometer-sized wear particles generated between DLC/DLC surfaces under boundary lubrication with an electric field