Synthesis of nano-Cu/graphene oxide composites by supercritical CO2-assisted deposition as a novel material for reducing friction and wear
Synthesis of nano-Cu/graphene oxide composites by supercritical CO2-assisted deposition as a novel material for reducing friction and wear
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超临界CO2辅助沉积合成纳米铜/氧化石墨烯复合材料作为减少摩擦和磨损的新型材料
DOI：
10.1016/j.cej.2015.06.073
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发表时间：
2015-12-01
影响因子：
15.1
通讯作者：
Chen, Yangzhi
中科院分区：
文献类型：
--
作者：
Meng, Yuan;Su, Fenghua;Chen, Yangzhi
采用超临界二氧化碳（scCO（2））辅助原位化学沉积法制备了纳米铜/氧化石墨烯（Sc-Cu/GO）复合材料。直径为5-10 nm的锚定Cu纳米颗粒均匀分布在GO纳米片表面。采用四球摩擦磨损试验机考察了Sc-Cu/GO复合材料作为润滑添加剂在液体石蜡油中的摩擦学性能。结果表明，Sc-Cu/GO纳米复合材料作为润滑油添加剂具有良好的抗磨减摩性能。将基础油与0.05wt.% Sc-Cu/GO的摩擦系数为0.065，磨痕直径为0.26 mm，比纯油分别降低27.0%和52.7%，比含0.05wt.%的油分别降低15.6%和35与含0.05wt.%的油相比，GO分别为13.3%和38.1%。纳米铜此外，Sc-Cu/GO复合材料的润滑性能远优于传统沉积法制备的Cu/GO纳米复合材料（没有scCO（2））。Sc-Cu/GO复合材料优异的润滑性能来源于GO纳米片和Cu纳米颗粒在滑动过程中的协同润滑作用。通过对钢球磨损表面的分析，讨论并提出了协同润滑作用。这项工作提供了一个有吸引力的战略，制造石墨烯基纳米复合材料作为节能润滑油添加剂。(C)2015 Elsevier B. V.版权所有。
Copper nanoparticle/graphene oxide (Sc-Cu/GO) composites were prepared by an in-situ chemical deposition with assistance of supercritical carbon dioxide (scCO(2)). The anchored Cu nanoparticles with diameter of 5-10 nm are uniformly distributed on the GO nanosheet surfaces. The tribological properties of the as-prepared Sc-Cu/GO composites as lubricating additive in liquid paraffin oil were evaluated using a four-ball tribometer. The results show that the Sc-Cu/GO nanocomposites as additives in oil have excellent anti-wear and friction-reducing abilities. The base oil mixed with 0.05 wt.% Sc-Cu/GO displays the friction coefficient of 0.065 and the wear scar diameter of 0.26 mm that are respectively reduced by 27.0% and 52.7% compared with the pure oil, 15.6% and 35% compared with the oil with 0.05 wt.% GO, 13.3% and 38.1% compared with oil with 0.05 wt.% nano-Cu. In addition, the lubricating performances of the Sc-Cu/GO composites are much better than that of the Cu/GO nanocomposites produced by the traditional deposition method (without scCO(2)). The excellent lubrication performances of the Sc-Cu/GO composites derive from the synergistic lubricating action of GO nanosheets and Cu nanoparticles during sliding process. The synergistic lubricating actions are discussed and proposed by analyzing the worn surfaces of the steel balls. This work offers an attractive strategy for fabricating graphene-based nanocomposites as energy efficient lubricant additives. (C) 2015 Elsevier B.V. All rights reserved.