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Black Phosphorus Quantum Dots in Aqueous Environments as Lubricants

FanfanLv,WeiWang,BinZhang,QianJia,YuanGao,KuaisheWang
ACS Applied Nano Materials Pub Date : 07/15/2023 00:00:00 , DOI:10.1021/acsanm.3c02340
Abstract
Frictional losses are one of the main factors affecting the reliability and service life of mechanical components. In this article, black phosphorus quantum dots (BPQDs) were prepared using the sonication exfoliation approach and investigated as aqueous solution lubrication. The prepared BPQDs with average diameters of 3.1 ± 0.6 nm were evenly distributed in pure water and exhibited excellent dispersion stability. Pure water and BPQDs aqueous solution were added at the same amount each time between the ball (GCr15 steel) and the plate (diamond-like carbon coating deposited on the surface of TC4 titanium alloy) to evaluate the differences in their tribological properties. The addition of BPQDs to pure water resulted in a 36.5% reduction in the coefficient of friction (COF) compared to pure water. The calculated wear rates also decreased by 59.0% at the same time (10 N). The initial Hertzian contact pressure ranged from 1000 to 1300 MPa. Additionally, the superior friction reduction and antiwear performance of the BPQD aqueous solution are principally attributable to the tribofilm that forms on the worn surface as well as its adsorption and rolling effect. This work aims to provide some meaningful guidelines for tribologists on the future study of BPQDs with low friction and low wear in the field of solid–liquid composite lubrication systems.
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