Tribological study of two ammonium chloride-decanoic acid deep eutectic solvents (DESs) as high-performance lubricants

IF 6.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Friction Pub Date : 2024-08-14 DOI:10.1007/s40544-024-0888-1

Zhuocheng Li, Enhui Zhang, Weimin Li, Haichao Liu

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Abstract

Deep eutectic solvents (DESs) are acknowledged as a novel class of functional liquid. DESs share similar physical properties with ionic liquids (ILs) and have the potential to be a novel class of lubricants. In this study, two DESs, namely tetrabutylammonium chloride-decanoic acid DES (C4-DES) and methyl tricaprylmethylammonium chloride-decanoic acid DES (C8-DES), were synthesized, and their physico-chemical properties and tribological performances were evaluated. Post-analysis of the rubbing surfaces used multiple techniques to gain insights into the lubrication mechanisms. Results show that the coefficient of friction (COF) and wear were reduced by approximately 29% and 91% for the C4-DES, and 36% and 94% for the C8-DES, compared to an ester base oil. The friction reduction behavior of the DESs is attributed to the monolayer adsorption of the polar group in the decanoic acid (DEAC), whose effectiveness is affected by the component of the ammonium salts in the DESs and the operating temperatures. In addition to the adsorbed film, worn surface analysis revealed that an ultra-thin tribochemical film with a thickness of 3–7 nm was formed on the surfaces lubricated with the C8-DES. The composition of the film was studied, and the lubrication mechanisms of the two DESs were discussed.

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两种氯化铵-癸酸深共晶溶剂 (DES) 作为高性能润滑剂的摩擦学研究

深共晶溶剂（DES）是公认的一类新型功能液体。DES 与离子液体 (IL) 具有相似的物理特性，有望成为一类新型润滑剂。本研究合成了两种 DES，即四丁基氯化铵-癸酸 DES（C4-DES）和甲基三丙烯酰甲基氯化铵-癸酸 DES（C8-DES），并评估了它们的物理化学性质和摩擦学性能。采用多种技术对摩擦表面进行了后分析，以深入了解润滑机制。结果表明，与酯类基础油相比，C4-DES 的摩擦系数（COF）和磨损分别降低了约 29% 和 91%，C8-DES 的摩擦系数（COF）和磨损分别降低了约 36% 和 94%。DESs 的减摩效果归功于癸酸（DEAC）中极性基团的单层吸附，其效果受 DESs 中铵盐成分和工作温度的影响。除吸附膜外，磨损表面分析表明，在使用 C8-DES 润滑的表面上形成了厚度为 3-7 纳米的超薄摩擦化学膜。研究了薄膜的成分，并讨论了两种 DES 的润滑机制。

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来源期刊

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.