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A schematic diagram of the MnFe2O4 nanoparticle production process used in this study. Fe(acac)3, Mn(ac)2, oleic acid, and trioctylamine were first mixed and heated to 305 °C. After Fe(acac)3, Mn(ac)2, oleic acid, and trioctylamine were added four times into the synthesis solution in different concentrations, the size of nanoparticles grew to approximately 100 nm. Subsequently, the nanoparticles were transformed from hydrophobic to hydrophilic with CHCl3, NaOH, PAH and PEI reaction.
