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Exploring the tribological performance of graphene nanoplatelets as an additive in aqueous glycerol for self-mated steel contacts [Elektronski vir]
Nadeem, Irfan ; Kalin, Mitjan
Reducing friction is an utmost concern in the modern world due to its great prospect of reducing energy consumption and environment-friendliness. Glycerol provides super low friction in industrially ...relevant sliding contacts such as steel and diamond-like carbon (DLC). With growing interest in green lubricants, we studied the effect of graphene nanoplatelets (GNPs) as an additive in aqueous glycerol for improved lubrication performance between self-mated steel contacts in a reciprocating sliding motion. The results show that the aqueous glycerol with graphene nanoplatelets shows superior dispersion stability and significantly reduces friction and wear scar diameter by 78% and 41%, respectively. This striking decrease in the coefficient of friction and wear is due to the extremely low shear stresses between asperities. Meanwhile, the hydrogen bond interaction between dangling bonds of ruptured graphene layers and aqueous glycerol contributes to the extremely low shear stresses of the liquid lubricating film. This work demonstrated that graphene-based green nano lubricants have a great potential to replace conventional environment polluting lubricants and paved the way for further investigation to get a deep insight into active lubrication mechanisms.
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