A Novel Nanomaterial of Graphene Oxide Dotted with Ni Nanoparticles Produced by Supercritical CO2-Assisted Deposition for Reducing Friction and Wear
A Novel Nanomaterial of Graphene Oxide Dotted with Ni Nanoparticles Produced by Supercritical CO2-Assisted Deposition for Reducing Friction and Wear
复制标题
超临界二氧化碳辅助沉积法制备的点缀镍纳米颗粒的新型纳米材料氧化石墨烯可减少摩擦和磨损
DOI：
10.1021/acsami.5b02650
复制
发表时间：
2015-06-03
影响因子：
9.5
通讯作者：
Chen, Yangzhi
中科院分区：
文献类型：
--
作者：
Meng, Yuan;Su, Fenghua;Chen, Yangzhi
在超临界二氧化碳（scCO（2））的辅助下，通过化学沉积法制备了掺杂镍纳米颗粒的氧化石墨烯（Sc-Ni/GO）。沉积的Ni纳米颗粒的直径小于5 nm的均匀锚定在GO纳米片的表面。将制备的Sc-Ni/GO复合材料作为润滑油添加剂，在四球摩擦磨损试验机上考察了其摩擦学性能。结果表明，Sc-Ni/GO复合材料是一种有效的润滑油添加剂。在石蜡油中加入0. 08 wt % Sc-Ni/GO，摩擦系数和磨痕直径分别比纯油降低32%和42%。此外，Sc-Ni/GO复合材料表现出比纳米Ni、GO纳米片和在没有scCO的帮助下制备的Ni/GO复合材料上级的润滑性能（2）。Sc-Ni/GO复合材料优异的润滑性能来源于摩擦过程中Ni纳米颗粒和GO纳米片的协同润滑作用。这种协同润滑作用与纳米复合材料的微观结构和接触钢球表面形成的转移膜特性密切相关。在GO表面锚定的尺寸更小、分布更均匀的Ni纳米颗粒以及在接触球上形成的薄转移膜有利于协同作用的充分发挥。
Graphene oxide dotted with nickel nanoparticles (Sc-Ni/GO) was synthesized by chemical deposition with the assistance of supercritical carbon dioxide (scCO(2)). The deposited Ni nanoparticles with diameters less than 5 nm are uniformly anchored on the surfaces of GO nanosheets. The as-prepared Sc-Ni/GO composites were employed as lubricating additives in paraffin oil and their tribological properties were tested using a four-ball tribometer. The results demonstrate that the Sc-Ni/GO composites are efficient lubricant additives. Adding 0.08 wt % Sc-Ni/GO into paraffin oil can reduce the friction coefficient and wear scar diameter by 32 and 42%, respectively, in comparison with the pure oil. In addition, Sc-Ni/GO composites exhibit superior lubricating performances than nano-Ni, GO nanosheets, and Ni/GO composites produced without the aid of scCO(2). Such excellent lubricating properties of the Sc-Ni/GO composites derive from the synergistic lubricating actions of Ni nanoparticles and GO nanosheets during the rubbing process. The synergistic lubricating actions are closely related to the microstructure of the nanocomposites and the characteristic features of transfer film formed on the contact steel balls. The anchored Ni nanoparticles with smaller size and more uniform distribution on GO surfaces and the thin transfer film formed on the contact balls favor the full play of the synergistic actions.