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Preparation and Evaluation of Tribological Properties of Cu Nanoparticles Surface Modified by Tetradecyl Hydroxamic Acid

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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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Acknowledgments

We acknowledge the financial support of Ministry of Science and Technology of China (project of “973” Plan: 2007CB607606 and project of “863” Plan: 2009AA03Z326) and National Natural Science Foundation of China (Grant 50975077).

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Kaifeng, 475004, China

    Xiujuan Xiong, Yingke Kang, Guangbin Yang, Shengmao Zhang, Laigui Yu & Pingyu Zhang

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  1. Xiujuan Xiong
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  2. Yingke Kang
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  3. Guangbin Yang
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  4. Shengmao Zhang
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  5. Laigui Yu
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Correspondence to Pingyu Zhang.

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Xiong, X., Kang, Y., Yang, G. et al. Preparation and Evaluation of Tribological Properties of Cu Nanoparticles Surface Modified by Tetradecyl Hydroxamic Acid. Tribol Lett 46, 211–220 (2012). https://doi.org/10.1007/s11249-012-9940-9

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  • DOI: https://doi.org/10.1007/s11249-012-9940-9

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