Journal of Nanomaterials / 2013 / Article / Fig 3

Research Article

Size-Controlled Synthesis of CoFe2O4 Nanoparticles Potential Contrast Agent for MRI and Investigation on Their Size-Dependent Magnetic Properties

Figure 3

Control of the sizes of CoFe2O4/ /citrate NPs by varying different parameters. The feeding orders of (a) and (b) were adding NH4OH into (Co+Fe) and adding (Co+Fe) into NH4OH, respectively, and the red/black line represented the results of varying [Co2++Fe3+]/[OH]; (c) and (d) show the change of CoFe2O4 NPs sizes by adjusting the pH of (Co+Fe) and the reaction temperature, respectively.
(a) Adding NH4OH into (Co+Fe) of pH = 2
(b) Adding (Co+Fe) of pH = 2 into NH4OH
(c) Adding NH4OH into (1 M Co+2M Fe)
(d) Adding (1 M Co+2M Fe) into NH4OH

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