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Synthesis and Characterization of Oil Soluble Ag Nanoparticles
Sun Lei,Zhang Zhijun,Dang Hongxin
Author NameAffiliationE-mail
Sun Lei State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou730000;Key Laboratory of Special Functional Materials, Henan University, Kaifeng 475001  
Zhang Zhijun Key Laboratory of Special Functional Materials, Henan University, Kaifeng 475001 hnsunlei@hotmail.com  
Dang Hongxin State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou730000;Key Laboratory of Special Functional Materials, Henan University, Kaifeng 475001  
Abstract:
Surface modified silver nano particles were synthesized in a mixture solvent of water-alcohol with Pyridinium di-n-octadecyldithio phosphate(PyDDP) as a modification agent. Themorphology 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 Thermo gravimetric analysis(TGA). Anti wear properties of Ag-DDP nano particles 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 15nm. 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.
Key words:  Silver, Nanoparticles, Surface modification, Anti-wear ability
FundProject:
油溶性Ag纳米微粒的制备及表征
孙磊,张治军*,党鸿辛
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15 nm,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.
关键词:    纳米微粒  表面修饰  抗磨性能
DOI:10.1088/1674-0068/17/5/618-622
分类号: