Song Wei, Yan Jincan, Ji Hongbing
Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.
School of Chemical Engineering, Shanghai Institute of Technology, Fengxian, Shanghai 201418, China.
ACS Appl Mater Interfaces. 2021 Oct 27;13(42):50573-50583. doi: 10.1021/acsami.1c16030. Epub 2021 Oct 14.
A graphene oxide (GO)-wrapped SiO nanosphere was modified with a 1-methylimidazolium bis(salicylato)borate (MEIMBScB) ionic liquid to form a SiO@GO@MEIMBScB nanocomposite. The SiO@GO@MEIMBScB nanocomposite exhibited a core-shell structure, which was characterized by Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, photoluminescence spectroscopy, dynamic light scattering, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The SiO@GO@MEIMBScB nanocomposite was dispersed into poly(ethylene glycol) 400 (PEG400) as a lubricant additive, and its tribological performance was evaluated with a four-ball tribometer under 392 N at 1450 rpm for 30 min. The results showed that the SiO@GO@MEIMBScB nanocomposite can reduce the friction coefficient by 57.27% and reduce the wear scar diameter by 16.98% at an optimized concentration. Its tribological performance was much better than the individual SiO@GO and MEIMBScB ionic liquid and the SiO@GO/MEIMBScB mixture. The SiO@GO@MEIMBScB nanocomposite exhibited a synergistic effect, which was confirmed by surface analysis on a wear track. It showed that SiO@GO@MEIMBScB can be adsorbed on the rubbing surface and form a tribo-boundary film to reduce friction and wear. A possible lubrication mechanism was proposed, which might guide the development of a novel nanolubricant additive.
用双（水杨酸根）硼酸1-甲基咪唑鎓（MEIMBScB）离子液体对氧化石墨烯（GO）包裹的SiO纳米球进行改性，以形成SiO@GO@MEIMBScB纳米复合材料。SiO@GO@MEIMBScB纳米复合材料呈现出核壳结构，通过傅里叶变换红外光谱、紫外可见光谱、光致发光光谱、动态光散射、X射线光电子能谱、扫描电子显微镜和透射电子显微镜对其进行了表征。将SiO@GO@MEIMBScB纳米复合材料作为润滑添加剂分散到聚乙二醇400（PEG400）中，并在392 N、1450 rpm条件下用四球摩擦磨损试验机对其摩擦学性能进行了30分钟的评估。结果表明，在优化浓度下，SiO@GO@MEIMBScB纳米复合材料可使摩擦系数降低57.27%，磨斑直径减小16.98%。其摩擦学性能远优于单独的SiO@GO和MEIMBScB离子液体以及SiO@GO/MEIMBScB混合物。SiO@GO@MEIMBScB纳米复合材料表现出协同效应，磨损轨迹的表面分析证实了这一点。结果表明，SiO@GO@MEIMBScB可以吸附在摩擦表面并形成摩擦边界膜，从而减少摩擦和磨损。提出了一种可能的润滑机制，这可能会指导新型纳米润滑添加剂的开发。
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