纳米CuO /还原石墨烯氧化物纳米复合材料作为高效油基添加剂的边界和弹性流体动力学润滑行为,Langmuir

当前位置： X-MOL 学术 › Langmuir › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

纳米CuO /还原石墨烯氧化物纳米复合材料作为高效油基添加剂的边界和弹性流体动力学润滑行为
Langmuir ( IF 3.7 ) Pub Date : 2019-07-17 00:00:00 , DOI: 10.1021/acs.langmuir.9b01244
Yuan Meng ₁ , Fenghua Su ₁ , Zhujun Li ₂

Affiliation

通过结合超临界水解和热裂解的有效方法，合成了氧化铜/还原氧化石墨烯（CuO / rGO）纳米复合材料。刚合成的CuO / rGO表现出独特的微观结构，其中超细CuO纳米颗粒被数个堆叠的rGO纳米片包裹。rGO纳米片上高度分散的CuO纳米颗粒呈球形，直径约为6 nm，并具有以碱为中心的单斜晶体结构。在边界润滑条件下，通过圆盘三botester评估了作为10w40发动机油的润滑油添加剂的CuO / rGO纳米复合材料的摩擦学性能。与裸露的10w40机油相比，含0.06-0.18 wt％CuO / rGO的机油的摩擦系数和磨损率分别降低46.62和77.05％。此外，CuO / rGO作为纳米添加剂显示出比rGO，CuO及其机械混合物优越的润滑能力。CuO / rGO纳米复合材料的这种协同润滑作用主要是由于其特殊的纳米结构，而不仅仅是CuO和rGO的共存。CuO / rGO纳米添加剂的抗磨损和降低摩擦的机理主要是由于其协同润滑作用以及由于纳米复合材料的自发沉积行为而在磨损表面上形成的摩擦膜。此外，还研究了rGO，CuO，混合物和CuO / rGO等纳米添加剂对改性机油的流变行为和弹性流体动力润滑（EHL）油膜的影响。结果表明，这些纳米添加剂可以在0-60°C的整个测试温度范围内将发动机油的粘度提高到一定程度。与裸露的相比，通过添加CuO / rGO纳米添加剂而使粘度显着增加，这对应于含CuO / rGO的机油的EHL膜增厚和EHL状态的增强。

"点击查看英文标题和摘要"

Boundary and Elastohydrodynamic Lubrication Behaviors of Nano-CuO/Reduced Graphene Oxide Nanocomposite as an Efficient Oil-Based Additive

Copper oxide/reduced graphene oxide (CuO/rGO) nanocomposite was synthesized by an effective approach combining supercritical hydrolysis and facile thermolysis. The as-synthesized CuO/rGO exhibited a unique microstructure in which ultrafine CuO nanoparticles were encapsulated by several stacked rGO nanosheets. The highly dispersed CuO nanoparticles on the rGO nanosheets were in spherical shape with diameters around 6 nm and had a base-centered monoclinic crystal structure. Tribological performances of the CuO/rGO nanocomposite as a lubricant additive of 10w40 engine oil were evaluated by a ball-on-disc tribotester under boundary lubrication. As compared to the bare 10w40 engine oil, the engine oil with 0.06–0.18 wt % CuO/rGO exhibits the reductions of 46.62 and 77.05% for friction coefficient and wear rate, respectively. In addition, CuO/rGO as a nanoadditive displays superior lubricating abilities than rGO, CuO, and their mechanical mixture. This synergistic lubricating effect of the CuO/rGO nanocomposite was mainly contributed to its special nanostructure rather than only the coexistence of CuO and rGO. The antiwear and friction-reducing mechanism of the CuO/rGO nanoadditive mainly results from its synergistic lubricating effect and the formed tribofilms on the wear surface due to the spontaneous deposition behavior of the nanocomposite. In addition, influences of the nanoadditives including rGO, CuO, the mixture, and CuO/rGO on the rheological behaviors and the elastohydrodynamic lubrication (EHL) oil film of the modified engine oil were also investigated. Results show that these nanoadditives can increase the viscosity of the engine oil to a certain extent throughout the test temperature range of 0–60 °C. The remarkable increase in viscosity by addition of the CuO/rGO nanoadditive corresponds to the thickening of the EHL film and the strengthening of the EHL state for the engine oil with CuO/rGO as compared to the bare one.

更新日期：2019-07-17

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南