However, the average COF showed a slightly increasing trend from 0.061 to 0.065 in the range of 0.3 wt.% to 0.5 wt.% MoS 2 QDs.
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The Application of Nano-MoS<sub>2</sub> Quantum Dots as Liquid Lubricant Additive for Tribological Behavior Improvement.
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The sentences
With the increase in additive, the viscosity of the composite lubricant oil exhibited an increasing trend, but the change was not the main factor behind the boundary lubrication regime for the ball-on-disc contact.