Tribological properties of graphene oxide as a lubricating additive in water and lubricating oils
Tribological properties of graphene oxide as a lubricating additive in water and lubricating oils
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DOI：
10.1299/mej.15-00323
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发表时间：
2015-01-01
影响因子：
0.5
通讯作者：
Fujii, Masahiro
中科院分区：
文献类型：
--
作者：
Kinoshita, Hiroshi;Ono, Hideki;Fujii, Masahiro
为了改善润滑液的性能，需要高性能的润滑添加剂。近年来，碳纳米材料如富勒烯、碳纳米管、碳洋葱等被研究作为水和润滑油的润滑添加剂。然而，这些碳纳米材料的成本太高，无法实际应用。另一方面，氧化石墨烯（GO）是一种碳纳米材料，由具有大量氧官能团的单原子厚片组成。由于氧化石墨烯是通过化学液体工艺从石墨合成的，因此氧化石墨烯的成本明显低于其他碳纳米材料。本文研究了氧化石墨烯单层片作为水和聚α -烯烃（PAO）添加剂的应用及其摩擦学性能。研究了氧化石墨烯-水分散体的摩擦系数与氧化石墨烯浓度（0.01 ~ 1.0质量%）的关系。特别是，浓度小于0.1质量%的氧化石墨烯-水分散体表现出较低的摩擦系数。在本研究中，氧化石墨烯直接分散在PAO中，使用表面活性剂和中间溶剂，而不需要干燥处理。我们发现，在观察到的磨损程度方面，阴离子表面活性剂在GO-PAO分散体中的使用优于阳离子表面活性剂。具体来说，在本研究中，使用氧化石墨烯浓度为4质量%的阴离子表面活性剂的GO- pao分散体磨损最小。此外，在PAO中加入氧化石墨烯并没有降低摩擦系数。最后，我们发现中间溶剂不影响润滑。
High-performance lubricating additives are desired in order to improve the properties of lubricating fluids. Recently, carbon nanomaterials such as fullerenes, carbon nanotubes, and carbon onions have been studied as lubricating additives for water and lubricating oils. However, the costs of these carbon nanomaterials are too high for practical use. On the other hand, graphene oxide (GO) is a carbon nanomaterial that consists of single atom thick sheets that possess a large number of oxygen functional groups. Since GO is synthesized from graphite using a chemical liquid process, the cost of GO is significantly lower than other carbon nanomaterials. In this study, the application and tribological properties of GO monolayer sheets as additives in water and poly-alpha olefin (PAO) were investigated. The dependence of the friction coefficient of GO-water dispersions on GO concentration (0.01-1.0 mass %) was investigated. In particular, GO-water dispersions with a concentration of less than 0.1 mass % demonstrated low friction coefficients. In this study, GO was simply dispersed in PAO using surfactant and intermediary solvents without the need for drying treatments. We found that the use of anionic surfactants in the GO-PAO dispersions was better than cationic surfactants in terms of the degree of wear observed. Specifically, GO-PAO dispersions that used an anionic surfactant with a GO concentration of 4 mass % had the smallest wear in this study. Moreover, friction coefficients were not decreased by the addition of GO in PAO. Finally, we found that intermediary solvents did not affect lubrication.