Research Article

Graphene Oxide Nanosheets as Effective Friction Modifier for Oil Lubricant: Materials, Methods, and Tribological Results

Figure 4

Friction coefficient in a 1-hour steady state test with average hertzian contact pressure 1.68 GPa and oil temperature 80°C. (a) Sliding speed 5.0 mm/s, boundary regime; (b) sliding speed 0.50 m/s, mixed regime (SN150— black, SN150 with 0.1 wt% GO—red).