Graphene has attracted attention in the field of lubrication based on its excellent properties. However, the difficulty of graphene dispersion in base oil hinders its development. In this paper, the effects of ionic liquid as additives on the dispersion and lubricating properties of graphene lubricants were investigated. Results showed that after adding ionic liquid, the graphene could be still stably dispersed in base oil even after 30 days. Molecular simulation study showed that ionic liquid tended to insert into graphene layers, and promoted the affinity of graphene and base oil. Then, the tribological friction behaviour of ionic liquid/graphene lubricants was investigated by concentration of ionic liquid, applied load and sliding velocity. Results showed that the friction and wear property was improved better after adding ionic liquid. This work provides a new method to enhance the stability of the graphene lubricating oil, and thus broaden the graphene in tribological application.

中文翻译：

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离子液体对石墨烯润滑剂的分散性和摩擦学性能的影响

石墨烯因其优异的性能而在润滑领域引起了关注。然而，石墨烯在基础油中分散的困难阻碍了其发展。本文研究了离子液体作为添加剂对石墨烯润滑剂的分散性和润滑性能的影响。结果表明，加入离子液体后，即使经过30天，石墨烯仍可以稳定地分散在基础油中。分子模拟研究表明，离子液体倾向于插入石墨烯层中，并促进了石墨烯与基础油的亲和力。然后，通过离子液体的浓度，施加的载荷和滑动速度研究了离子液体/石墨烯润滑剂的摩擦摩擦行为。结果表明，加入离子液体后，摩擦磨损性能得到了较好的改善。