烷基化液体碳点用于提高石蜡基基础油的摩擦学性能  

Improving the Tribological Properties of Paraffin by Alkylated Liquid Carbon Dots

作　　者：尹克样 闫明明 王新宇 郝俊英[1] 李洪光[2] YIN Keyang;YAN Mingming;WANG Xinyu;HAO Junying;LI Hongguang(State Key Laboratory of Solid L ubrication,L anzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Key Laboratory of Colloid and Interface Chemistry,Ministry of Education,Shandong University,Shandong Jinan 250100,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]山东大学胶体与界面化学教育部重点实验室,山东济南250100 [3]中国科学院大学,北京100049

出　　处：《摩擦学学报》2020年第5期664-672,共9页Tribology

基　　金：国家自然科学基金面上项目(21875129)资助。

摘　　要：以油胺为原料,通过在氯苯中简单加热回流,并经后续硅胶柱层析纯化,制备了烷基包覆、室温下呈液态的蓝光碳点.高分辨透射电子显微镜(HR-TEM)、红外光谱和荧光光谱证明了烷基化蓝光碳点的成功制备.差示扫描量热(DSC)证明了碳点的室温液体属性.将碳点添加到石蜡基基础油中,发现其与基础油具有良好的相容性,并且混合体系呈现出良好的长效稳定性.研究了碳点添加量对基础油减摩抗磨效果的影响.与纯石蜡基基础油相比,添加碳点能明显改善其摩擦学行为,当碳点添加质量分数为0.1%时,摩擦系数和磨损体积均有所减小;当碳点添加质量分数为1.0%时,摩擦系数达到最小.这是由于在摩擦过程中,摩擦副表面形成了1层碳膜和四氧化三铁,阻止了摩擦副间的直接接触.Blue fluorescent liquid carbon dots(C dots)with alkyl chains coated on the surface were obtained by simply refluxing oleylamine in chlorobenzene followed by purification through silica gel column chromatography.Highresolution transmission electron microscope(HR-TEM),Fourier transform infrared spectrum(FT-IR)and fluorescence spectrum proved the successful preparation of alkylated,blue-emitting C dots.Differential scanning calorimeter(DSC)proved the liquid character of the C dots at room temperature.The C dots showed good compatibility with paraffin oil and the mixture exhibited long-term stability.The effect of the amount of C dots on friction reduction and anti-wear of paraffin oil was studied.Both the friction coefficient and wear volume of the mixture with 0.1%C(weight fraction)dots were lower than that of pure paraffin oil.When the amount of C dots reached 1.0%(weight fraction),the minimum friction coefficient was obtained.The good performance of C dots in improving the anti-friction and anti-wear effect of paraffin oil was due to the formation of a layer of carbon and a layer of iron tetroxide.

关 键 词：烷基化 碳点 添加剂 摩擦学性能 油胺 

分 类 号：TH117.3[机械工程—机械设计及理论]