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Loss and Recovery of Nano-MoS2 Lubricity in Carbon Soot Contaminated Polyalphaolefin

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Abstract

Carbon soot (CS) is a contaminant of engine oil, and the interaction between CS and oil additives should be understood. This work investigated the interaction between CS and nano-MoS2. Results show that adding 0.5% nano-MoS2 in polyalphaolefin significantly improved the lubricity. However, the lubricity of nano-MoS2 unexpectedly disappeared after adding 0.5% CS because CS prevented nano-MoS2 from forming a tribofilm. Interestingly, the lubricity was mostly recovered by ZDDP, which removed the inhibition of CS by helping form a MoS2-contained tribofilm. Another method was also found to remove the inhibition without the help of ZDDP, that is, replacing nano-MoS2 with nano-MoS2/nano-TiO2 heterostructures. Nano-TiO2 was immune to soot and could carry nano-MoS2 into the friction interface by their heterojunction to synergistically form a tribofilm.

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Data Availability

The data will be shared on reasonable request to the corresponding author.

Abbreviations

3D:

Three-dimensional

COF:

Coefficient of friction

CS:

Carbon soot

EDS:

Energy dispersive x-ray spectroscopy

HFRR:

High-frequency reciprocating rig

HRTEM:

High-resolution transmission electron microscopy

LSM:

Laser scanning microscopy

PAO:

Polyalphaolefin

SEM:

Scanning electron microscopy

T202 (ZDDP):

Zinc butyl octyl dithiophosphate

WSD:

Wear scar diameter

XPS:

X-ray photoelectron spectrometry

XRD:

X-ray powder diffraction

ZDDP:

Zinc dialkyl dithiophosphates

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (Grant No. 52075144) and the Natural Science Foundation for Colleges and Universities in Anhui Province (Grant No. 2022AH010096).

Funding

National Natural Science Foundation of China (Grant No. 52075144); Natural Science Foundation for Colleges and Universities in Anhui Province (Grant No. 2022AH010096).

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Authors and Affiliations

  1. School of Energy Materials and Chemical Engineering, Hefei University, Hefei, 230601, China

    Yan Miao, Chonglong Zhong, Zhixiang Li, Yong Xu, Enzhu Hu & Kunhong Hu

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  1. Yan Miao
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  2. Chonglong Zhong
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  3. Zhixiang Li
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  4. Yong Xu
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Contributions

YM as a master student who finished part tribological tests and characterization, and wrote the main manuscript. CZ as a master student who finished part tribological tests and characterization. ZL as a master student who finished part characterization. YX who gave some suggestions for the experiment process and analyzed part data. EH who gave some suggestions for the experiment process and analyzed part data. KH as a corresponding author who organize the manuscript and supply the fee to study this research. He also analyzes the tribological mechanisms.

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Correspondence to Kunhong Hu.

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Miao, Y., Zhong, C., Li, Z. et al. Loss and Recovery of Nano-MoS2 Lubricity in Carbon Soot Contaminated Polyalphaolefin. Tribol Lett 71, 120 (2023). https://doi.org/10.1007/s11249-023-01793-6

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