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

Table 1

Friction coefficient in steady boundary and EHL lubrication conditions at 25°C.

	Average Hertzian contact pressure 1.68 GPa, oil temperature 25°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	EHL regime
SN150—base oil	0.158	0.142	Benchmark
SN150 with 0.1 wt% GO	0.136	0.118	−14%  −17%