One-step nanohybrid synthesis in waste cooking oil, for direct lower environmental impact and stable lubricant formulation

Organic medium dispersible Cu nanoparticles (NPs) were directly prepared in a waste cooking oil (WCO) through a new “green” “wet chemistry” approach. The synthesis product (Cu NPs + WCO) was blended at different concentrations in PAO6 to obtain innovative low environmental impact and stable lubricant formulations. The effect of the additive on the oxidative stability of PAO6 was monitored by gas chromatography-mass spectrometry analysis. The addition of Cu NPs to the PAO6+WCO mixture determines a 76.9% reduction of the formed oxidative by-products, with a 100% reduction on the respect of the PAO6 by-products. The role of the nanoadditives as friction modifier allows evaluating the optimum concentration of 15 vol%, with a friction coefficient reduction of about 15%.