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Preparation of Cu@SiO 2 composite nanoparticle and its tribological properties as water‐based lubricant additive
Author(s) -
Liu Tiantian,
Zhou Changhua,
Gao Chuanping,
Zhang Yujuan,
Yang Guangbin,
Zhang Pingyu,
Zhang Shengmao
Publication year - 2020
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1487
Subject(s) - lubricant , nanoparticle , distilled water , materials science , tribology , tribometer , chemical engineering , emulsion , dispersion (optics) , microstructure , composite number , dispersion stability , composite material , nanotechnology , chromatography , chemistry , physics , optics , engineering
In this paper, to solve the problem that di‐ n ‐hexadecyldithiophosphate (DDP)‐modified Cu nanoparticles initially used as oil‐based lubricant additive cannot be directly used in water‐based lubricants, we adopt a water‐in‐oil reverse micro‐emulsion method to incorporate hydrophobic Cu nanoparticles into silica spheres for obtaining water‐dispersible Cu@SiO 2 nanoparticles. The effects of reaction conditions on the morphology and microstructure of Cu@SiO 2 nanoparticles were investigated. Furthermore, the tribological properties of the as‐prepared Cu@SiO 2 nanoparticles as a lubricant additive in distilled water were investigated with a UMT‐2MT tribometer. Results indicate that the as‐prepared Cu@SiO 2 nanoparticles exhibit good dispersion stability and antioxidant ability in distilled water. Besides, Cu@SiO 2 nanoparticles can significantly improve the tribological properties of distilled water, which is attributed to the formation of a protective and lubricious film consisting of Cu, FeS and SiO 2 on the rubbed steel surface.