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The effect of oleic acid on the superparamagnetic Fe3O4 nanoparticles has been investigated in this study. The addition of oleic acid could improve the particle size distribution by the formed protective layer on the surface of Fe3O4 nanoparticles. All of Fe3O4 coated with oleic acid displayed superparamagnetic characterizations, and the interaction between two competing mechanisms, agglomeration and chelation, was discussed to explain the function of oleic acid. The optimal addition of oleic acid was fixed to be 4 wt%, which obtained the highest magnetization saturation value (Ms) of 82.066 emu/g.
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Wang et al. (2014) studied this question.
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