Dispersibility, Shape and Magnetic Properties of Nano-Fe₃O₄ Particles

Xiaojuan Liang, Haowei Shi, Xiangchen Jia, Yuxiang Yang, Xiangnong Liu

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DOI: 10.4236/msa.2011.211219                

Abstract

Nano-Fe₃O₄ particles were prepared by a two-step microemulsion method, the influence of molar ratio of water to NP-5 (R), alkali concentration and temperature on dispersibility and shape of the nanoparticles were discussed. Magnetic studies were also carried out using VSM in this paper. It was found that the optimum preparation parameters are R = 6.0, alkali concentration = 2.5 mol^.L^–1, initial total iron concentration as 0.88 mol^.L–1, and the temperature being 30°C, the prepared nano magnetite particles have uniform size and good dispersibility with a crystal structure belonging to cubicFe₃O₄ and lattice parameters of a = 8.273 Å. The results of magnetic studies show, magnetic properties of particles are influenced by dispersibility of nanoparticles which depends on size of clusters. The better dispersibility of nanoparticles leads to more ordered inner magnetic vector, and so the stronger magnetic behavior of nano-Fe₃O₄ particles.

Keywords

Nano-Fe₃O₄ Particle, Dispersibility of Nanoparticles, Magnetic Properties, Saturation Magnetization

Conflicts of Interest

The authors declare no conflicts of interest.

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