effect of the smallest microwave-synthesized cu2s nanoparticles with surfactant templates on improving the properties of engine oil

In this study, the preparation and identification of cu2s nanoparticles were carried out using the microwave method, and the effect of irradiation time, power, and surfactant on particle size was investigated. the sample was characterized by xrd measurements, field emission scanning electron microscopy (fe-sem), fourier transform infrared (ft-ir), and ultraviolet-visible (uv-vis). also, the results of fe-sem on nanoparticles prepared with four surfactants, edta, sorbitol, citric acid, and peg 400, showed that nanoparticles synthesized with the peg 400 surfactant have the smallest size. then, the effect of microwave power on the size of cu2s nanoparticles was investigated at three powers of 700, 500, and 900 w. the fe-sem results showed that cu2s nanoparticles have the smallest size at 500 w. to investigate the effect of time on the size of cu2s nanoparticles, the experiments were repeated at times of 3, 5, and 10 min, and the fe-sem results obtained from this stage showed that after 10 min, cu2s nanoparticles have the smallest size. also, the effects of the prepared cu2s nanoparticles on the thermal conductivity, density, and viscosity of engine oil were investigated. the results obtained from this research show that the increase in thermal conductivity compared to the base oil indicates that these nanoparticles improve the heat transfer ability and operation of engine oil in harsher temperature conditions.