MoS<sub>2</sub> Compounded with FG through Layered Loading for Synergistic Lubrication: A High-Performance Lubricant for Extreme Environmental Condition
Li Gao, Xiaohua Jia, Ding Wang, Haojie Song
Abstract
MoS 2 is widely used in friction applications due to its special layered structure. However, it is prone to oxidation in harsh environments, resulting in reduced lubrication performance. It is well documented that fluorinated graphene (FG) has a tightly packed fluorinated carbon layer, which forms a physical barrier to effectively inhibit oxidation. In this study, MoS 2 and FG nanosheets were prepared by an ionic liquid crystal (ILC)-assisted exfoliation technique. FG spontaneously encapsulates MoS 2 by π–π stacking and interfacial interaction to form stable MoS 2 @FG nanocomposites through dynamic sonication treatment. The cationic groups of ILC were adsorbed onto the defective sites on the MoS 2 surface and synergistically constructed a protective system with FG to inhibit oxidation. The results showed that the friction coefficient of MoS 2 @FG in water was reduced to 0.096. In addition, MoS 2 @FG exhibited stable low friction coefficients in PAO oil, rapeseed oil, seawater, and H 2 SO 4 . The study reveals the synergistic lubrication mechanism of MoS 2 @FG through interlayer interaction, which provides new design ideas and technological approaches for the development of high-performance lubricant materials for harsh industrial environments.