The tribological behaviour of graphene oxide nanosheets in mineral oil was investigated under a wide spectrum of conditions,\r\nfrom boundary and mixed lubrication to elastohydrodynamic regimes. A ball-on-disc setup tribometer has been used to verify the\r\nfriction reduction due to nanosheets prepared by a modified Hummers method and dispersed in mineral oil. Their good friction\r\nand antiwear properties may possibly be attributed to their small structure and extremely thin laminated structure, which offer\r\nlower shear stress and prevent interaction between metal interfaces. Furthermore, the results clearly prove that graphene platelets\r\nin oil easily form protective film to prevent the direct contact between steel surfaces and, thereby, improve the frictional behaviour\r\nof the base oil. This evidence is also related to the frictional coefficient trend in boundary regime.
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