improvement of sn500 lubricant using cuoand zno nanoparticles

In this research, the effect of cuo and zno nanoparticles (nps) addition on the stability of friction and wear behavior of sn500 base oil is studied. the wear behavior is studied by the pin-on-disk testing method on st37 steel disks in presence of the prepared lubricants. the test results indicate that zno nps introduced to the base oil are more effective in reducing friction in comparison with cuo nps. non-ionic nonylphenol-10 and coconut fatty acid surfactants were used to improve the stability of the nanofluids. roughness studies by afm images confirmed that both nps were effective in reducing fiction and wear of st37 steel surface.