The reduced graphene oxide (RGO) decorated with rare earth organic complex, Eu(Phen)(OA)₃, was successfully synthesized by a simple hydrothermal process. The prepared RGO/Eu(Phen)(OA)₃ composites (RGECs) served as lubricating oil additives in Polyalphaolefin-8 (PAO8) and their tribological properties were investigated by SRV-IV fretting friction and wear testing machine. Experimental results indicate that the dispersion stability of RGECs in base oil PAO8 has been optimized greatly compared with that of graphene. The friction coefficient has no obvious change; however, the service life of the base oil, that is effective lubrication time is greatly extended, which is better than the commercial additive Zinc Dialkyldithiophosphate (ZDDP). Furthermore, adding appropriate amount (0.08 wt%) of RGECs is able to reduce the wear spot area by about 56%, the wear rate by about 37% compared with ZDDP. Moreover, these excellent results are attributed to the synergistic effects of RGO nanosheets and Eu(Phen)(OA)₃ powders.

Graphical Abstract

中文翻译：

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高负荷下具有良好抗磨性能的分散良好的润滑油添加剂的制备

通过简单的水热法成功地合成了以稀土有机配合物Eu（Phen）（OA）₃装饰的还原氧化石墨烯（RGO）。准备好的RGO / Eu（Phen）（OA）₃复合材料（RGECs）作为聚α-8烯烃（PAO8）中的润滑油添加剂，通过SRV-IV微动摩擦磨损试验机研究了它们的摩擦学性能。实验结果表明，与石墨烯相比，RGECs在基础油PAO8中的分散稳定性得到了极大的优化。摩擦系数无明显变化。但是，基础油的使用寿命（即有效润滑时间）大大延长，这比市售添加剂二烷基二硫代磷酸锌（ZDDP）更好。此外，与ZDDP相比，添加适量（0.08 wt％）的RGEC能够减少磨损点面积约56％，磨损率降低约37％。此外，这些出色的结果归因于RGO纳米片和Eu（Phen）（OA）₃的协同作用 粉末。

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