Surface modification of Fe₃O₄ nanoparticles and their magnetic properties

Hao Yan,Jian-cheng Zhang,Chen-xia You,Zhen-wei Song,Ben-wei Yu,Yue Shen School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

摘 要：Fe3O4 magnetic nanoparticles were synthesized by the hydrothermal method,and the influences of the surfactant sodium bis（2-ethylhexyl） sulfosuccinate （AOT） on the particles were investigated. The structure,morphology,and magnetic properties of the products were characterized by X-ray powder diffraction （XRD）,transmission electron microscopy （TEM）,Fourier transform infra-red spectroscopy （FT-IR）,and vibrating sample magnetometer （VSM）. It is confirmed that the as-prepared nanoparticles have been modified by using the surfactant during the synthesis process. The amount of the surfactant has an effect on the size,the dispersal,and the magnetic properties of the particles. Besides,the mechanisms of the influences were also discussed.

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