Preparation and Evaluation of Tribological Properties of Cu Nanoparticles Surface Modified by Tetradecyl Hydroxamic Acid |
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Authors: | Xiujuan Xiong Yingke Kang Guangbin Yang Shengmao Zhang Laigui Yu Pingyu Zhang |
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Affiliation: | (1) Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng, 475004, China; |
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Abstract: | Oil-soluble Cu nanoparticles without phosphorus and sulphur elements were prepared using in situ surface-modification technique
with hydrazine hydrate as a reductant and tetradecyl hydroxamic acid (THA) as a modifier. The phase composition, microstructure,
and chemical structure of as-synthesized Cu nanoparticles (coded as THA-capped Cu or THA-capped nano-Cu) were analyzed by
means of X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectrometry. The thermal stability
of THA-capped Cu was examined using thermogravimetric analysis and differential thermal analysis. The antiwear ability of
THA-capped Cu as an additive in liquid paraffin was examined using a four-ball machine, and the morphology of worn steel balls
was examined using a scanning electron microscope, an energy dispersive spectrometer and an X-ray photoelectron spectroscopy.
It has been found that THA-capped Cu can be well dispersed in some organic solvents. As-synthesized THA-capped Cu as an environmentally
friendly additive in liquid paraffin shows excellent antiwear ability for the steel–steel contact. Besides, Cu nanoparticles
are able to deposit and fill up micropits and grooves on steel sliding surfaces under a higher load and hence greatly reduced
wear of the steel–steel pair thereat by way of self-repairing of worn surfaces of the steel–steel frictional pair, showing
promising application as an environmentally acceptable lubricating oil additive. |
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