Abstract
The oxidation kinetics of nickel nanoparticles having an approximate mean diameter of 15.5 nm was studied here. Conversion data were derived from both thermogravimetric analysis (TGA) and X-ray diffraction (XRD) analysis in the temperature range of 280∼350°.C. The results were consistent with each other and found to be modeled well by the equation based on core-shell diffusion controlled kinetics. Oxidation rate constant of nickel nanoparticles were fitted for these temperatures and its activation energy was found to be about 32.4 kcal/mol. The resulting Arrhenius expression of rate constant is k (cm 2 /s) = 9.33 × 1- -5 exp (-32.4 (kcal/mol)/RT).