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

Table 2

Friction coefficient in steady boundary and mixed lubrication conditions at 80°C.

	Average Hertzian contact pressure 1.68 GPa, oil temperature 80°C
Sample	Average friction coefficient at 5.0 mm/s sliding speed	Average friction coefficient at 0.50 m/s sliding speed	Difference
	Boundary regime	Mixed regime
SN150—base oil	0.173	0.163	Benchmark
SN150 with 0.1 wt% GO	0.141	0.139	−18%  −15%