▎ 摘　　要

The present study investigates the tribological properties of nanolubricants dispersed with dodecylamine functionalized graphene (DAG) in commercial engine oil. Standard techniques were used to determine the morphology of the DAG and the worn surfaces. The tribological properties of the nanolubricants were measured using UMT-2 tribotester with an in-house attachment developed for measuring the friction of liquid lubricants. The nanolubricants were observed to reduce the coefficient of friction (COF) by a maximum similar to 40% in comparison to base engine oil. Parameters including the concentration, load and sliding velocity were found to influence the variation of COF considerably. Characterization of the wear tracks by EDX and XPS suggests the formation of a tribo-film as the plausible mechanism which lowers the COF in case of the nanolubricants.