An inorganic-organic hybrid CQDs@PVP lubricant additive: Achieving low friction and wear in PEG and water

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-07-24 DOI:10.1007/s40544-024-0871-x
Tao Yang, Xiaozhen Wang, Huanchen Liu, Qin Zhao, Kuiliang Gong, Weimin Li, Yongmin Liang, Xiaobo Wang
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Abstract

High-temperature lubrication has always been a hot topic in the lubricant and grease industry, and is also an essential concern in the high-end equipment sector to be addressed. Carbon quantum dots (CQDs) are an emerging material widely applied in the field of lubrication, owing to their exceptional lubricity and high load-bearing capacity. However, the vulnerability of CQDs to oxidation in air and reduced stability dramatically restrict their high-temperature application capability. In this study, a nanocomposite of amphiphilic polyvinyl pyrrolidone (PVP) homopolymer with excellent lubricating properties and thermal stability, which is hydrogen bonded to CQDs (CQDs@PVP), was designed to achieve low friction and wear of lubricants at high temperatures. The CQDs@PVP are consistently dispersed in both PEG400 and water, and exhibit superior lubricity compared to unmodified CQDs at high temperatures (ranging from 200–150 °C and 90.50 °C). Meanwhile, the dense carbon film on the wear surface and the chemically reactive film of iron compounds directly contribute to the enhanced lubrication performance. These analytical results demonstrate the powerful candidacy of CQDs@PVP as a lubrication additive and promote future high-temperature applications of CQDs in industrial production.

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一种无机-有机混合 CQDs@PVP 润滑油添加剂:在 PEG 和水中实现低摩擦和低磨损
高温润滑一直是润滑油和润滑脂行业的热门话题,也是高端设备领域亟待解决的重要问题。碳量子点(CQDs)因其优异的润滑性和高承载能力,成为润滑领域广泛应用的新兴材料。然而,碳量子点在空气中易氧化且稳定性较差,这极大地限制了其高温应用能力。本研究设计了一种具有优异润滑性能和热稳定性的两亲性聚乙烯吡咯烷酮(PVP)均聚物与 CQDs(CQDs@PVP)氢键结合的纳米复合材料,以实现润滑剂在高温下的低摩擦和低磨损。CQDs@PVP 可稳定地分散在 PEG400 和水中,与未改性的 CQDs 相比,在高温下(200-150 ℃ 和 90.50 ℃)表现出卓越的润滑性。同时,磨损表面的致密碳膜和铁化合物的化学反应膜直接促进了润滑性能的提高。这些分析结果证明了 CQDs@PVP 作为润滑添加剂的强大适用性,并促进了 CQDs 未来在工业生产中的高温应用。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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