OPTIMIZATION OF SYNTHESIS CONDITIONS FOR CoxFe3-xO4 NANOPARTICLES USING PLACKETT-BURMAN DESIGN AND RESPONSE SURFACE METHODOLOGY (RSM)

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Abstract

 In this paper, we optimize the parameters for hydrothermal Co_xFe_3-xO₄ nanoparticles synthesis using the Plackett-Burman experimental design and the Box-Behnken design with response surface methodology (RSM). Our results showed that the temperature (^oC), the NaOH concentration (M) and the Co^2+/Fe³⁺ ion molar ratio were identified as significant factors. After screening, these factors were subsequently optimized using the Box-Behnken design with response surface methodology. These optimal levels were found out temperature (570 ^oC), NaOH concentration (3M) and ion molar ratio Co^2+/Fe³⁺ (1:2) in which the highest saturation obtained 63.67 emu/g at room temperature. This model was tested experimentally, the saturation magnetization (M_s) was 62.14 emu/g and 60.03 emu/g corresponding with the low magnetic force (H_c) of 11 Oe and 32 Oe. The magnetic properties of the samples were characterized by the vibrating sample magnetometer (VSM). Our results also indicated that the Plackett-Burman experimental design and the Box-Behnken design with response surface methodology are a suitable tool in order to optimize the parameters for hydrothermal Co_xFe_3-xO₄ nanoparticles synthesis.