Effect of Cu-Doped Carbon Quantum Dot Dispersion Liquid on the Lubrication Performance of Polyethylene Glycol

Energy saving and reduced consumption of key materials such as bearings in high-end equipment can be realized by synthesizing a new lubricating functional additive, copper-doped carbon quantum dot dispersion liquid (Cu-CQDs) via hydrothermal reaction with glycerol, cupric chloride dihydrate, choline raw materials. The influence the containing Cu-CQDs nanoparticles on properties polyethylene glycol (PEG200) was investigated four-ball friction tester. wear scars steel balls after were analyzed using scanning electron microscope accompanied energy dispersive spectroscopy (SEM/EDS), photoelectron microscopy, Raman spectroscopy. results revealed mechanism Cu-CQDs. significantly enhance lubrication performance PEG. average coefficient PEG 2.0 wt% 40.99% lower than that pure ascribed to friction, inducing participate formation boundary film, resulting low scar diameter.