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Abstract
Improvement in wettability and lubricity of water/glycerol base fluid by the synergy of nanoparticles (NPs) and protic ionic liquid (PIL) was experimentally investigated. The hybrid additives were made by combining graphene nanoplatelets or silicon oxide nanoparticles with tert-octylamine oleate PIL. A lubricating sample preparation procedure included ultrasonication, centrifugation and magnetic stirring. Kinematic viscosity, pH, and wettability were evaluated. The tribo-tests were performed on a ball-on-plate reciprocating tribometer. It was observed that NPs alone could not improve the lubricity of the base fluid. However, the lubricity was substantially enhanced by using the PIL additive. Furthermore, the combination of NPs and PIL provided an even better tribological response. The hybrid additives improved wettability and facilitated composite tribo-film formation.
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