Sun Lei, Zhang Zhijun, Dang Hongxin. Synthesis and Characterization of Oil Soluble Ag Nanoparticles[J]. Chinese Journal of Chemical Physics , 2004, 17(5): 618-622. doi: 10.1088/1674-0068/17/5/618-622
Citation: Sun Lei, Zhang Zhijun, Dang Hongxin. Synthesis and Characterization of Oil Soluble Ag Nanoparticles[J]. Chinese Journal of Chemical Physics , 2004, 17(5): 618-622. doi: 10.1088/1674-0068/17/5/618-622

Synthesis and Characterization of Oil Soluble Ag Nanoparticles

doi: 10.1088/1674-0068/17/5/618-622
Funds:  Project supported by the Science Research Foundation of Henan University (XK02100), China.
  • Received Date: 2003-09-05
  • 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.
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Synthesis and Characterization of Oil Soluble Ag Nanoparticles

doi: 10.1088/1674-0068/17/5/618-622
Funds:  Project supported by the Science Research Foundation of Henan University (XK02100), China.

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.

Sun Lei, Zhang Zhijun, Dang Hongxin. Synthesis and Characterization of Oil Soluble Ag Nanoparticles[J]. Chinese Journal of Chemical Physics , 2004, 17(5): 618-622. doi: 10.1088/1674-0068/17/5/618-622
Citation: Sun Lei, Zhang Zhijun, Dang Hongxin. Synthesis and Characterization of Oil Soluble Ag Nanoparticles[J]. Chinese Journal of Chemical Physics , 2004, 17(5): 618-622. doi: 10.1088/1674-0068/17/5/618-622

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