Study of graphene-family nanomaterials as grease additives for electro-regulated friction

Graphene-family materials show significant potential as electro-regulated lubrication additives due to their tunable properties under electrical stimuli. However, a comprehensive comparison of their performance in such conditions remains lacking, limiting their broader industrial adoption. This study explores the electro-regulated friction behavior of graphene (GN), graphene oxide (GO), and fluorinated graphene (FG) nanosheets as grease additives. Results indicate that GN additives demonstrated good antifriction and antiwear performance under constant negative electrical stimulation compared to GO and FG additives. It also demonstrates good stability and repeatability in friction regulation under varying electrical conditions, which is attributed to its deposition on contact surfaces, enhancing lubrication. Furthermore, the direction of electrical stimulation affects GN’s oxidation (or defect) level, with reduced oxidation levels (fewer defects) correlating to lower friction. These findings deepen the understanding of graphene-family materials and provide a basis for designing advanced nanoadditives with enhanced electro-regulated performance.