Comparing the effects of undoped and cobalt doped copper oxide nanoparticles on the enhancement of water thermal conductivity coefficient

In this study, cobalt doped copper oxide nanoparticles (Cu1-xCoxO) for different amounts of cobalt concentrations were fabricated successfully. The fabricated samples were characterized by XRD and SEM. X-ray diffraction patterns confirmed the formation of copper oxide and also the substitution of cobalt atoms in the position of copper atoms in the crystal lattice structure of CuO. After that, water-based nanofluids were fabricated by adding different percentages of cobalt doped copper oxide nanoparticles to pure water. Measurement of the thermal conductivity coefficient (TCC) of fabricated nanofluids showed that the TCCs of samples is increased due to the addition of the (Cu1-xCoxO) nanoparticles. This study showed that doping of copper oxide with cobalt causes more increase in the TCCs of nanofluids, and the rate of this increment linearly depends on the dopant concentration. The TCC dependencies of the nanofluids to the temperature and concentration of nanoparticles were also investigated.