Tribological Properties of Green ILs Containing MoS 2 Quantum Dots with One-Step Preparation
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ORIGINAL PAPER
Tribological Properties of Green ILs Containing MoS2 Quantum Dots with One‑Step Preparation Chao Ju1,2 · Dongdong Zheng1,2 · Qin Zhao1 · Xiaobo Wang1 Received: 17 March 2020 / Accepted: 21 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The MoS2 quantum dots less than 10 nm were in situ prepared in green ILs for the first time. The MoS2 quantum dots can be easily obtained by simple one-step synthesis within the preparation of ILs themselves. The physico-chemical and tribological properties of the acquired the MoS2 QDs in ILs were systematically studied. Compared with pure ILs, the MoS2 QDs in ILs exhibiting long-term dispersion stabilities have superior lubricating properties under harsh conditions. Thin films formed according to the XPS results were attributed to be the main account for the preferable tribological properties of the MoS2 QDs in ILs than pure ILs. Keywords MoS2 quantum dots · Green ILs · One-step preparation · Friction reduction and anti-wear
1 Introduction ILs have been widely concerned and studied in tribological fields since 2001, because they have outstanding lubricity both as lubricants and additives under different environmental conditions [1–5]. However, the complex and expensive synthesis process of ionic liquid lubricants limits its practical application. In order to solve this problem, the research and development of PILs have been continuously developed in recent years, which not only embodies the advantages of traditional ionic liquids, but also can be synthesized by simple and cheap methods. PILs with perfluoroalkyl chains have been used in magnetic media lubrication by Kondo [6–9]. Tulia Espinosa researched the lubricating property of some PILs as neat lubricants on copper–copper contacts [10] and as additives in water [11]. Aviles et al. have reported on binary and ternary ammonium ionic liquid crystals as additives in water on sapphire-stainless steel contact [12]. Our previous work has also explored the use of sulfur-containing ammonium * Qin Zhao [email protected] * Xiaobo Wang [email protected] 1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100039, China
2
carboxylate proton ionic liquids as grease additive [13]. Although the synthesis method is relatively simple and cheap, the raw materials used to prepare these ILs are non renewable materials. Therefore, the research of environmental ILs with the advantages of simple synthesis like PILs as lubricants and additives from environmentally friendly materials has been proposed in recent years. Shi used a kind of PILs synthesized from equimolar oleyl amine and oleic acid in lubricant industry [14]. Akshar Patel et al. reported the lubricating ability of the PILs from citric acid both as a pure lubricant and an additive [15]. Aviles also has reported the PILs prepared by diprotic ammonium succinate in aqueous lubrication [16
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