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MoS 2 /WS 2 Quantum Dots as High‐Performance Lubricant Additive in Polyalkylene Glycol for Steel/Steel Contact at Elevated Temperature
Author(s) -
Wu Xinhu,
Gong Kuiliang,
Zhao Gaiqing,
Lou Wenjing,
Wang Xiaobo,
Liu Weimin
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201700859
Subject(s) - materials science , tungsten disulfide , molybdenum disulfide , lubricant , tribology , base oil , friction modifier , tungsten , lubrication , tungsten carbide , dispersion stability , molybdenum , quantum dot , metallurgy , chemical engineering , composite material , nanoparticle , nanotechnology , scanning electron microscope , engineering
Herein, molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ) quantum dots (QDs) are prepared by a facile and green technique, and characterized by microscopy and spectroscopy. The resulting products display exceptional stability in polyalkylene glycol (PAG) base oil, and are used for the first time as friction reducing and antiwear additives in PAG for steel/steel contact. Tribological measurements indicate that the stable dispersion consisting of PAG mixed with MoS 2 /WS 2 QDs exhibits significant tribological properties compared with pure PAG and PAG containing MoS 2 /WS 2 QDs nanosheets under different loads at elevated temperatures. The excellent tribological behaviors of MoS 2 /WS 2 QDs are attributed to the formation of a boundary lubrication film, which can be generated not only by the physical entrapment of MoS 2 /WS 2 QDs at the ball‐disk contact surfaces, but also by tribochemical reaction between MoS 2 /WS 2 and the iron atoms/iron oxide species.