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Research Article | Open Access

Solvent-free carbon sphere nanofluids towards intelligent lubrication regulation

Sheng ZHANG1,†, Wen LI2,†, Xiaoliang MA2, Xiaoqiang FAN2( ), Minhao ZHU1,2( )
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China

† Sheng ZHANG and Wen LI contributed equally to this work.

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Abstract

By simply switching the electrical circuit installed on steel/steel contact, the tribological behaviors of nanofluids (NFs) can be regulated in real time, thereby achieving the desired performance of friction reduction and wear resistance. Herein, solvent-free carbon spherical nanofluids (C-NFs) were successfully prepared for intelligent lubrication regulation. C-NFs with excellent lubrication performance can immediately reduce the coefficient of friction (COF) despite applying a weak electric potential (1.5 V). Moreover, polyethylene glycol 400 (PEG400) containing 5.0 wt% C-NFs remained responsive to electrical stimulation under the intermittent voltage application with an average coefficient of friction (ACOF) reduction of 20.8% over PEG400. Such intelligent lubrication regulation of C-NFs under an external electric field (EEF) mainly depends on the orderly arranged double-electric adsorption film of ion canopy-adsorbed carbon spheres (CSs). The intermittent electrical application can continuously reinforce the adsorption film and its durability for real-time controlling the sliding interfaces. Electrical-stimulation-responsive intelligent lubricants provide a new technical support for realizing intelligent stepless control of devices.

Keywords

solvent-free carbon spherical nanofluids (C-NFs)intelligent lubrication regulationlubrication performanceadsorption film

References

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Friction
Volume 12 Issue 1,
January 2024
Pages 95-109
DOI: 10.1007/s40544-023-0737-7

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Cite this article:
ZHANG S, LI W, MA X, et al. Solvent-free carbon sphere nanofluids towards intelligent lubrication regulation. Friction, 2024, 12(1): 95-109. https://doi.org/10.1007/s40544-023-0737-7

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Received: 25 August 2022
Revised: 24 November 2022
Accepted: 05 January 2023
Published: 11 May 2023
© The author(s) 2023.

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