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Adding ZnO and MoS2 nanoparticles to pure oils at different concentrations increased the flash point of the nano lubricants relative to the pure diesel oil. Compared to the pure diesel oil, the flash point of ZnO and MoS2 nano lubricants at 0.7 wt.% of each of the nanoparticles increased by 5.88% and 5.04%, respectively.

The pure diesel oil containing ZnO and MoS2 nanoparticles showed better anti-friction and anti-wear features as compared with the pure lubricant. The optimum concentration for ZnO and MoS2 nanoparticles was 0.4 wt.% and 0.7 wt.%, respectively. Friction coefficient at optimal concentrations from each of the ZnO and MoS2 nano lubricants decreased by 5.86% and 12.29%, respectively. Also, the results of the mass loss of the pins indicated better anti-wear performance of MoS2 nanoparticles than ZnO nanoparticles.

In nutshell, MoS2 nanoparticles had more excellent anti-friction and anti-wear characteristics in comparison with ZnO nanoparticles