Abstract Although graphene oxide (GO) is deemed as an admirable lubricant additive to enhance the tribological properties of water, there remain great challenges in improving its dispersion stability and re-dispersity in water, and understanding the effects of dispersity and exfoliation degree on lubricity of GO. Herein, the functionalized GO (GO-EmimN(CN)2) with extraordinary dispersity, re-dispersity and high exfoliation degree is successfully prepared using 1-ethyl-3-methyl imidazolium dicyanamide as intercalator of multilayer graphene oxide (MGO). GO-EmimN(CN)2 as water-based lubricant additive dramatically decreases the wear rate and wear width of GCr15 steel by 74% and 40% compared to pure water, 53% and 45% to MGO respectively. Finally, lubricating mechanisms of GO-EmimN(CN)2 are determined and proposed via abundant surface analysis techniques.

中文翻译：

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超分散单层氧化石墨烯作为水基润滑添加剂：制备、表征和润滑机制

摘要 尽管氧化石墨烯 (GO) 被认为是一种令人钦佩的润滑剂添加剂，可提高水的摩擦学性能，但在提高其在水中的分散稳定性和再分散性，以及了解分散性和剥离程度对润滑性的影响方面仍存在巨大挑战。去。在此，使用1-乙基-3-甲基咪唑鎓二氰胺作为多层氧化石墨烯（MGO）的嵌入剂成功制备了具有非凡分散性、再分散性和高剥离度的官能化GO（GO-EmimN（CN）2）。与纯水相比，GO-EmimN(CN)2 作为水基润滑剂添加剂使 GCr15 钢的磨损率和磨损宽度显着降低了 74% 和 40%，与 MGO 相比分别降低了 53% 和 45%。最后，