Fabrication of Zn_۱-XCu_XO nanoparticles and investigation of their effect on the thermal conductivity of nanofluids

The main purpose of this research is to investigate the effect of doped nanoparticles on the thermal conductivity of nanofluids. ZnO, CuO, and Zn۱-XCuXO doped nanoparticles were first fabricated by the sol-gel auto-combustion method using glycine as fuel with different molar ratios of glycine/metal ions. Different values of X = ۰.۰۲, ۰.۰۳, ۰.۰۴, ۰.۰۶, ۰.۰۷, and ۰.۰۸ were used to fabricate the Zn۱-XCuXO doped nanoparticles. The X-ray diffraction patterns showed that the substitution of Zn atoms with Cu atoms was completed for X = ۰.۰۲ and ۰.۰۳, so X = ۰.۰۳ was obtained as the solubility limit for fabricating Zn۱-XCuXO doped nanoparticles. The Zno, CuO, and Zn۰.۹۷Cu۰.۰۳O doped nanoparticles were then used as an additive to prepare ethylene glycol-based nanofluids with different nanoparticle concentrations. The results showed the highest observed thermal conductivity enhancement was ۱۲.۵ % and related to the nanofluid containing Zn۰.۹۷Cu۰.۰۳O doped nanoparticles at a concentration of ۰.۵ wt%. Moreover, adding Cu to the ZnO structure increased the thermal conductivity of the ethylene glycol-based nanofluid containing Zn۰.۹۷Cu۰.۰۳O doped nanoparticles due to its high thermal conductivity.

کلیدواژه ها:

sol-gel auto-combustion method ، zinc oxide ، doped nanoparticles ، Nanofluids ، Thermal Conductivity