TITLE:
Dispersibility, Shape and Magnetic Properties of Nano-Fe3O4 Particles
AUTHORS:
Xiaojuan Liang, Haowei Shi, Xiangchen Jia, Yuxiang Yang, Xiangnong Liu
KEYWORDS:
Nano-Fe3O4 Particle, Dispersibility of Nanoparticles, Magnetic Properties, Saturation Magnetization
JOURNAL NAME:
Materials Sciences and Applications,
Vol.2 No.11,
November
16,
2011
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.