作　　者： ; ; ;

机构地区： 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

出　　处： 《Chinese Journal of Chemical Physics》 2004年第5期618-622,共5页

摘　　要： 以双十八烷氧基二硫代磷酸吡啶盐为修饰剂 ,以单宁酸为还原剂 ,在水醇混合溶剂中合成了表面修饰的Ag纳米微粒 ,采用X射线粉末衍射仪、透射电子显微镜、傅立叶变换红外光谱仪、热分析仪等对其进行了结构表征 ,在四球摩擦试验机上测试了其抗磨性能 .结果表明 ,表面修饰的Ag纳米微粒粒径分布均匀 ,平均粒径约为15nm ,无团聚现象 ,可溶于液体石蜡等有机溶剂 ,作为润滑油添加剂 ,具有良好的抗磨作用 ,可显著提高基础油的承载力 . Surface modified silver nanoparticles were synthesized in a mixture solvent of water-alcohol with Pyridinium di-n-octadecyldithiophosphate (PyDDP) as a modification agent. The morphology and structure of DDP-coated Ag (Ag-DDP) nanoparticles were characterized using X-ray powder diffraction(XRD), Transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and The rmogravimetric analysis (TGA). Antiwear properties of Ag-DDP nanoparticles were tested using a four-ball tribological testing machine. The disperse properties of Ag-DDP nanoparticles were evaluated in solvents such as chloroform, benzen, toluene, liquid paraffin, distilled water and ethanol. The results show that Ag-DDP nanoparticles disperse in organic solvents, but they don't disperse in water or ethanol. The good disperse properties in organic solvents enable Ag-DDP nanoparticles to be used as oil additives. The XRD pattern of Ag-DDP nanoparticles indicates that they have fcc crystal structure, and the modification layer can prevent the oxidation of Ag nanocores. TEM graphs show that Ag-DDP nanoparticles have a homogeneous grain distribution; the average diameter is about 15 nm. FT-IR and TGA curves indicate that the existence of modification layer can prevent the adsorption of water on the surface of nanoparticles. Tribological tests show that Ag-DDP nanoparticles have good anti-wear properties in liquid paraffin, and they can improve the applied load of base oil.

关 键 词： 银 纳米微粒 表面修饰 抗磨性能

领　　域： [理学] [理学]