纳米流体
润滑
材料科学
润滑油
聚乙二醇
碳纤维
复合材料
类金刚石碳
量子点
钻石
化学工程
磨损(机械)
吸附
纳米技术
纳米颗粒
薄膜
有机化学
复合数
化学
工程类
作者
Fu Wang,Lunlin Shang,Guangan Zhang,Zhaofeng Wang
出处
期刊:Friction
[Springer Nature]
日期:2021-11-10
卷期号:10 (9): 1393-1404
被引量:19
标识
DOI:10.1007/s40544-021-0549-6
摘要
Abstract Polyethylene glycol derived carbon quantum dots nanofluids were synthesized via a slow thermal oxidation process. The size of carbon quantum dots was ca. 2 nm and had a decreasing trend with the increase of oxidation time. When used as lubricant in a diamond-like carbon film/bearing steel interface, the nanofluids achieved an ultra-low friction coefficient ( μ ≈ 0.02), much lower than that of original polyethylene glycol ( μ = 0.12). The worn surface analyses revealed that the nanofluids could effectively inhibit the tribo-oxidation of steel counterpart that occurred under original polyethylene glycol lubrication, and hence reduced the abrasion component of friction. Especially, the poly-hydroxyl carbon dots and oxidized polyethylene glycol species in nanofluids induced a hydroxyl-rich sliding interface via their tribochemical reactions with friction surfaces, which promoted the adsorption of polyethylene glycol molecules on sliding surfaces. Along with the mild corrosion wear of steel counterface, this shifted the boundary lubrication to a mixed/film lubrication regime, thereby achieving an ultra-low friction coefficient. The above results suggest that the polyethylene glycol derived carbon quantum dots nanofluids should be a quite excellent candidate lubricant for solid-liquid synergy lubrication based on diamond-like carbon films.
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