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Nano-sized cobalt powder was fabricated by wet chemical reduction method at room temperature. Theeffects of various experimental variables on the overall properties of fabricated nano-sized cobalt powders have beeninvestigated in detail, and amount of NaOH and reducing agent and dropping speed of reducing agent have been prop-erly selected as experimental variables in the present research. Minitab program which could find optimized conditionswas adopted as a statistic analysis. 3D Scatter-Plot and DOE (Design of Experiments) conditions for synthesis of nano-sized cobalt powder were well developed using Box-Behnken DOE method. Based on the results of the DOE process,reproducibility test were performed for nano-sized cobalt powder. Spherical nano-sized cobalt powders with an averagesize of 70-100 nm were successfully developed and crystalline peaks for the HCP and FCC structure were observedwithout second phase such as Co(OH) 2 .Keywords: Nano-sized cobalt powder, Wet chemical reduction, Design of experiments, Reproducibility

Optimization of Wet Reduction Processing for Nanosized Cobalt Powder