Polyethylene glycol derived carbon quantum dots nanofluids: An excellent lubricant for diamond-like carbon film/bearing steel contact

Fu WANG; Lunlin SHANG; Guangan ZHANG; Zhaofeng WANG

doi:10.1007/s40544-021-0549-6

Friction 2022, 10(9): 1393-1404 https://doi.org/10.1007/s40544-021-0549-6

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Open Access | Issue | Published: 10 November 2021

Polyethylene glycol derived carbon quantum dots nanofluids: An excellent lubricant for diamond-like carbon film/bearing steel contact

Show Author's Information Hide Author's Information Fu WANG^¹, Lunlin SHANG^¹, Guangan ZHANG^{¹^,²}, Zhaofeng WANG^{¹^,²}(

)

1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:

ultra-low friction, polyethylene glycol, diamond-like carbon films, synergy lubrication

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WANG F, SHANG L, ZHANG G, et al. Polyethylene glycol derived carbon quantum dots nanofluids: An excellent lubricant for diamond-like carbon film/bearing steel contact. Friction, 2022, 10(9): 1393-1404. https://doi.org/10.1007/s40544-021-0549-6

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Abstract

Polyethylene glycol derived carbon quantum dots nanofluids were synthesized via a slow thermal oxidation process. The size of carbon quantum dots was ca. 2 nm and had a decreasing trend with the increase of oxidation time. When used as lubricant in a diamond-like carbon film/bearing steel interface, the nanofluids achieved an ultra-low friction coefficient (μ ≈ 0.02), much lower than that of original polyethylene glycol (μ = 0.12). The worn surface analyses revealed that the nanofluids could effectively inhibit the tribo-oxidation of steel counterpart that occurred under original polyethylene glycol lubrication, and hence reduced the abrasion component of friction. Especially, the poly-hydroxyl carbon dots and oxidized polyethylene glycol species in nanofluids induced a hydroxyl-rich sliding interface via their tribochemical reactions with friction surfaces, which promoted the adsorption of polyethylene glycol molecules on sliding surfaces. Along with the mild corrosion wear of steel counterface, this shifted the boundary lubrication to a mixed/film lubrication regime, thereby achieving an ultra-low friction coefficient. The above results suggest that the polyethylene glycol derived carbon quantum dots nanofluids should be a quite excellent candidate lubricant for solid–liquid synergy lubrication based on diamond-like carbon films.

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Polyethylene glycol derived carbon quantum dots nanofluids: An excellent lubricant for diamond-like carbon film/bearing steel contact

Show Author's information Hide Author's Information Fu WANG^¹, Lunlin SHANG^¹, Guangan ZHANG^{¹^,²}, Zhaofeng WANG^{¹^,²}(

)

1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

Keywords: ultra-low friction, polyethylene glycol, diamond-like carbon films, synergy lubrication

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Publication history

Received: 22 May 2021

Revised: 30 July 2021

Accepted: 15 August 2021

Published: 10 November 2021

Issue date: September 2022

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51805519), and the Natural Science Foundation for Distinguished Young Scholars of Gansu Province (No. 20JR5RA572).

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