Achieving graphene-based lubricants with simultaneous excellent dispersibility and tribological performance remains challenging as graphene tends to agglomerate in lubricating oils. Herein, a fluid-like graphene oxide (FL-GO) was developed based on covalent grafting and epoxide ring-opening reactions, which exhibited obviously improved dispersion ability and tribological behaviors in polyethylene glycol (PEG). The dispersion stability of FL-GO was demonstrated by sedimentation experiment and the 0.5% of FL-GO reduced wear volume of 91.1% and friction coefficient of 43.7%. This well-dispersed graphene helps continue to generate an uneven lubricating film on the rubbing surface, thereby improving the friction and wear performance of the lubricating oils.

同时获得优异的分散性和摩擦学性能的石墨烯基润滑剂仍然具有挑战性，因为石墨烯倾向于在润滑油中凝聚。在此，基于共价接枝和环氧化物的开环反应，开发了一种流体状的氧化石墨烯（FL-GO），其在聚乙二醇（PEG）中的分散能力和摩擦学性能均得到了明显改善。通过沉淀实验证明了FL-GO的分散稳定性，0.5％的FL-GO减少了91.1％的磨损量和43.7％的摩擦系数。这种良好分散的石墨烯有助于在摩擦表面上继续产生不均匀的润滑膜，从而改善润滑油的摩擦和磨损性能。