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In this study, water soluble CuO nanostructures having nanobelt, nanorod, or spindle morphologies were synthesized using aqueous solutions of Cu(NO3)2·3H2O and NaOH by adjusting the type of surface modifier and reaction temperature. The effect of morphologies of these various CuO nanostructures as water-based lubricant additives on tribological properties was evaluated on a UMT-2 micro-friction tester, and the mechanisms underlying these properties are discussed. The three different morphologies of CuO nanostructures exhibited excellent friction-reducing and anti-wear properties. Tribological mechanisms differed in the initial stage of frictional interactions, but in the stable stage, a tribochemical reaction film and adsorbed lubricious film on the rubbing surfaces played important roles in hindering direct contact between friction pairs, leading to improved tribological properties.


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Controllable synthesis of different morphologies of CuO nanostructures for tribological evaluation as water-based lubricant additives

Show Author's information Junhua ZHAOGuangbin YANG( )Yujuan ZHANGShengmao ZHANGChunli ZHANGChuanping GAOPingyu ZHANG( )
Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, China

Abstract

In this study, water soluble CuO nanostructures having nanobelt, nanorod, or spindle morphologies were synthesized using aqueous solutions of Cu(NO3)2·3H2O and NaOH by adjusting the type of surface modifier and reaction temperature. The effect of morphologies of these various CuO nanostructures as water-based lubricant additives on tribological properties was evaluated on a UMT-2 micro-friction tester, and the mechanisms underlying these properties are discussed. The three different morphologies of CuO nanostructures exhibited excellent friction-reducing and anti-wear properties. Tribological mechanisms differed in the initial stage of frictional interactions, but in the stable stage, a tribochemical reaction film and adsorbed lubricious film on the rubbing surfaces played important roles in hindering direct contact between friction pairs, leading to improved tribological properties.

Keywords: morphology, tribological properties, CuO nanostructures, water-based lubricant additive

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Publication history

Received: 21 November 2019
Revised: 27 January 2020
Accepted: 07 March 2020
Published: 14 August 2020
Issue date: October 2021

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© The author(s) 2020

Acknowledgements

The authors acknowledge the financial support provided by National Natural Science Foundation of China (Nos. 51775168, 21671053, 51875172, 51605143, and 51605469), Scientific and Technological Innovation Team of Henan University (No. 19IRTSTHN024), and Key Scientific Research Project of Colleges and Universities in Henan Province (No. 20A150003)

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