Abstract
The Cu nanoparticle surface coated with S-hexyl N,N-dihydroxyethyl dithiocarbamate (SHNDD) was synthesized by the controlled reduction of aqueous copper salts using the modified Brust synthesis. The morphology, structure and thermal properties of the modified Cu nanoparticles (SHNDD-nano Cu) was investigated by means of transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectrum, and thermogravimetric analysis. As the results of TEM and IR spectrum shown, the size of as-prepared nanoparticles is about 6 nm and existence of the organic carbon chain on the surface of nanoparticles is observed. The tribological behaviors of Cu nanoparticles in liquid paraffin were evaluated on a four-ball testing machine. The results show that Cu nanoparticles as oil additives can improve the load-carrying capacity and antiwear property of the base oil. The rubbed surfaces were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It can be inferred that a tribological reaction film was formed, which contributed to the good tribological properties of surface modified Cu nanoparticles.
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