Application of graphene with excellent dispersion stability and interfacial adsorption properties under high-frequency and high-speed conditions

• Published in: Journal of materials research Vol. 37; no. 23; pp. 4326 - 4337
• Main Authors: Cheng, Gangqiang, Wang, Mingyue, Zhou, Ming, You, Shengli, Chen, Xin, Mo, Youtang, Liu, Ziyan, Li, Xiao, Quan, Jin, Luo, Chaogui
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 14-12-2022; Springer Nature B.V
• Subjects: Adsorption; Antifriction; Applied and Technical Physics; Biomaterials; Chemistry and Materials Science; Coefficient of friction; Dispersion; Graphene; Inorganic Chemistry; Interface stability; Materials Engineering; Materials research; Materials Science; Nanotechnology; Nitrogen; Oil additives; Oxidation; Steel plates; Tribology; Antifriction; Modified graphene; High-speed friction; Lubricant additive; Dispersion stability
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-022-00802-z

The lubrication performance of graphene is reduced at high frequencies and speeds owing to the agglomeration and poor interfacial adsorption of graphene. In this study, we used a mild oxidation method to prepare graphene oxide, onto which polar nitrogen-containing groups were grafted to prepare covalently modified graphene. The modified graphene retained a graphene structure and exhibited excellent dispersion stability and interfacial adsorption properties. It was stably dispersed in 500 N base oil for more than 60 days. Tribological tests with a steel ball–steel plate friction system (rate: 75 mm/s; reciprocating frequency: 25 Hz) showed that the friction coefficient of the sliding surface was ~ 0.063 when using 500 N base oil with the modified graphene as a lubricating additive, which was approximately 47.1% lower than that when using pure 500 N base oil.
Graphical abstract
Schematic of antifriction mechanism of MG as 500N base oil additive.