Graphene is a promising material as a lubricant additive for reducing friction and wear. Here, a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base oil. The stable dispersion time of modified graphene (0.5 wt%) with dispersant (1 wt%) in PAO-6 could be up to about 120 days, which was the longest time reported so far. At the same time, the lubricant exhibits a significant improvement of tribological performance for a steel ball to plate tribo-system with a normal load of 2 N. The coefficient of friction between sliding surfaces was ~0.10 and the depth of wear track on plate was ~21 nm, which decreased by about 44% and 90% when compared to pure PAO-6, respectively. Furthermore, the analysis of the lubricating mechanisms in regard to the sliding-induced formation of nanostructured tribo-film has been contacted by using Raman spectra and TEM.

石墨烯是一种有前途的材料，可作为减少摩擦和磨损的润滑剂添加剂。在此，已经成功开发了将十八碳烯胺和二环己基碳二亚胺对石墨烯进行化学改性与一种有效分散剂相结合的分散方法，以实现石墨烯在基础油中的显着分散稳定性。改性石墨烯（0.5 wt％）和分散剂（1 wt％）在PAO-6中的稳定分散时间可能长达120天左右，这是迄今为止报道的最长时间。同时，该润滑剂对正常载荷为2 N的钢球到板摩擦系统表现出显着的摩擦学性能。滑动表面之间的摩擦系数为〜0.10，并且板上的磨损痕迹深度为〜21 nm，与纯PAO-6相比，分别减少了约44％和90％，分别。此外，已经通过使用拉曼光谱和TEM接触了关于滑动诱导形成的纳米结构摩擦膜的润滑机理的分析。