Dispersibility, Shape and Magnetic Properties of Nano-Fe<sub>3</sub>O<sub>4</sub> Particles
- 1
- 2
- 3
- 4
- 5
Abstract
Nano-Fe<sub>3</sub>O<sub>4</sub> 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<sup>.</sup>L<sup>–1</sup>, initial total iron concentration as 0.88 mol<sup>.</sup>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 cubicFe<sub>3</sub>O<sub>4</sub> 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-Fe<sub>3</sub>O<sub>4</sub> particles.
- V. E. Fertman, “Magnetic Fluids Guide-Book: Properties and Applications,” Hemisphere Publishing Co., New York, 1990.
- A. Kondo and H. Fukuda, “Preparation of Thermosensitive Magnetic Microspheres and their Application to Bioprocesses,” Colloids and Surfaces A: Physicochemical and Engineering, Vol. 153, 1999, pp. 435-438. doi:10.1016/S0927-7757(98)00465-8
- D. G. Shchukin, I. L. Radtchenko and G. B. Sukhorukov, “Micron-Scale Hollow Polyelectrolyte Capsules with Nano-Sized Magnetic Fe3O4 Inside,” Materials Letters, Vol. 57, 2003, pp. 1743-1747. doi:10.1016/S0167-577X(02)01061-3
- B. Gr?eta, M. Risti?, I. Nowik and S. Musi?, “Formation of Nanocrystalline Magnetite by Thermal Decomposition of Iron Choline Citrate,” Journal of Alloys and Compounds, Vol. 334, 2002, pp. 304-312. doi:10.1016/S0925-8388(01)01792-3
- T. J. Daou, G. Pourroy, S. Bégin-Colin, J. M. Grenèche, C. Ulhaq-Bouillet, P. Legaré, P. Bernhardt, C. Leuvrey and G. Rogez, “Hydrothermal Synthesis of Monodisperse Magnetite Nanoparticles,” Chemistry Materials, Vol. 18, 2006, pp. 4399-4404. doi:10.1021/cm060805r
- T. Sugimoto and E. Matijevic, “Formation of Uniform Spherical Magnetite Particles by Crystallization from Ferrous Hydroxide Gels,” Journal of Colloid and Interface Science, Vol. 74, 1980, pp. 227-243. doi:10.1016/0021-9797(80)90187-3
- Y. S. Kang, S. Risbud, J. F. Rabolt and P. Stroeve, “Synthesis and Characterization of Nanometer-Size Fe3O4 and γ-Fe2O3 Particles,” Chemistry Materials, Vol. 8, 1996, pp. 2209-2211. doi:10.1021/cm960157j
- T. Fried, G. Shemer, G. Markovich, “Ordered Two-Di- mensional Arrays of Ferrite Nanoparticles,” Advanced Materials, Vol. 13, 2001, pp. 1158-1161. doi:10.1002/1521-4095(200108)13:15 3.0.CO;2-6
- G. Visalakshi, G. Venkataswaran, S. K. Kulshreshtha and P. N. Moorthy, “Compositional Characteristics of Magnetite Synthesised from Aqueous Solutions at Temperatures Upto 523K,” Materials Research Bulletin, Vol. 28, 1993, pp. 829-836. doi:10.1016/0025-5408(93)90024-8
- S. Wang, H. Xin and Y. Qian, “Preparation of Nanocrys- talline Fe3O4 by γ-ray Radiation,” Materials Letters, Vol. 33, 1997, pp. 113-116. doi:10.1016/S0167-577X(97)00077-3
- D. Vollath and D. V. Szabo, “Synthesis and Magnetic Properties of Nanostructured Maghemite,” Journal of Materials Research, Vol. 12, 1997, pp. 2175-2182. doi:10.1557/JMR.1997.0291
- C. Feldmann and H. O. Jungk, “Polyol-Mediated Prepara- tion of Nanoscale Oxide Particles,” Angewandte Chemie International Edition, Vol. 40, 2001, pp. 359-362. doi:10.1002/1521-3773(20010119)40:2 3.3.CO;2-2