AMPC  Vol.3 No.1 A , April 2013
A Study of γ-Fe2O3 Nanoparticles Modified Using ZnCl2 during Synthesis
Abstract: Surface modification of γ-Fe2O3 nanoparticles synthesized by a chemically induced transition has been attempted by adding ZnCl2 during synthesis. The structure of the modified particles was studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The experimental results showed that ZnFe2O4 grew epitaxially on the γ- Fe2O3 crystallites to form composite nanoparticles with the spinel structure, on which FeCl3 might be adsorbed. The apparent grain size dc estimated by XRD using the Scherrer equation was larger rather than smaller than the average particle size measured by TEM. This paradox can be explained by the effect of absorption in the coating heterolayer.
Cite this paper: L. Chen and J. Li, "A Study of γ-Fe2O3 Nanoparticles Modified Using ZnCl2 during Synthesis," Advances in Materials Physics and Chemistry, Vol. 3 No. 1, 2013, pp. 31-35. doi: 10.4236/ampc.2013.31A004.

[1]   S. H. Sun, “Recent Advances in Chemical Synthesis, Self-Assembly, and Applications of FePt Nanoparticles,” Advanced Materials, Vol. 18, No. 4, 2006, pp. 393-403. doi:10.1002/adma.200501464

[2]   J. Jiang and Y. M. Yang, “Facile Synthesis of Nanocrystalline Spinel NiFe2O4 via a Novel Soft Chemistry Route,” Materials Letters, Vol. 61, No. 21, 2007, pp. 4276-4279. doi:10.1016/j.matlet.2007.01.111

[3]   Q. M. Zhang, J. Li, Y. Q. Lin, X. D. Liu and H. Miao, “The Preparation and Characterization of Ni-Fe Bioxide Composite Nanoparticles,” Journal of Alloys and Compounds, Vol. 508, No. 2, 2010, pp. 396-399. doi:10.1016/j.jallcom.2010.08.065

[4]   B. C. Wen, J. Li, Y. Q. Lin, X. D. Liu, J. Fu, H. Miao and Q. M. Zhang, “A Novel Preparation Method for Gamma- Fe2O3 Nanoparticles and Their Characterization,” Materials Chemistry and Physics, Vol. 128, No. 1-2, 2011, pp. 35-38. doi:10.1016/j.matchemphys.2011.01.012

[5]   H. Miao, J. Li, Y. Q. Lin, X. D. Liu, Q. M. Zhang and J. Fu, “Characterization of Gamma-Fe2O3 Nanoparticles Prepared by Transformation of Alpha-FeOOH,” Chinese Science Bulletin, Vol. 56, No. 22, 2011, pp. 2383-2388. doi:10.1007/s11434-011-4559-z

[6]   D. V. Szabó and D. Vollath, “Nanocomposites from Coated Nanoparticles,” Advanced Materials, Vol. 11, No. 15, 1999, pp. 1313-1316. doi:10.1002/(Sici)1521-4095(199910)11:15<1313::Aid-Adma1313>3.0.Co;2-2

[7]   J. Liu, S. Z. Qiao, Q. H. Hu and G. Q. Lu, “Magnetic Nanocomposites with Mesoporous Structures: Synthesis and Applications,” Small, Vol. 7, No. 4, 2011, pp. 425- 443. doi:10.1002/smll.201001402

[8]   Q. X. Liu, Z. H. Xu, J. A. Finch and R. Egerton, “A Novel Two-Step Silica-Coating Process for Engineering Magnetic Nanocomposites,” Chemistry of Materials, Vol. 10, No. 12, 1998, pp. 3936-3940. doi:10.1021/Cm980370a

[9]   M. A. Willard, L. K. Kurihara, E. E. Carpenter, S. Calvin and V. G. Harris, “Chemically Prepared Magnetic Nanoparticles,” International Materials Reviews, Vol. 49, No. 3, 2004, pp. 125-170. doi:10.1179/095066004225021882

[10]   M. Knobel, W. C. Nunes, L. M. Socolovsky, E. De Biasi, J. M. Vargas and J. C. Denardin, “Superparamagnetism and Other Magnetic Features in Granular Materials: A Review on Ideal and Real Systems,” Journal of Nanoscience and Nanotechnology, Vol. 8, No. 6, 2008, pp. 2836- 2857. doi:10.1002/chin.200943216

[11]   T. Sato, T. Iijima, M. Seki and N. Inagaki, “Magnetic Properties of Ultrafine Ferrite Particles,” Journal of Magnetism and Magnetic Materials, Vol. 65, No. 2-3, 1987, pp. 252-256. doi:10.1016/0304-8853(87)90044-8

[12]   S. Chakrabarti, D. Ganguli and S. Chaudhuri, “Optical Properties of Gamma-Fe2O3 Nanoparticles Dispersed on Sol-Gel Silica Spheres,” Physica E-Low-Dimensional Systems & Nanostructures, Vol. 24, No. 3-4, 2004, pp. 333- 342. doi:10.1016/j.physe.2004.06.036

[13]   A. Naravanaswamy, H. F. Xu, N. Pradhan and X. G. Peng, “Crystalline Nanoflowers with Different Chemical Compositions and Physical Properties Grown by Limited Ligand Protection,” Angewandte Chemie-International Edition, Vol. 45, No. 32, 2006, pp. 5361-5364. doi:10.1002/anie.200601553

[14]   C. G. Granqvist and R. A. Buhrman, “Ultrafine Metal Particles,” Journal of Applied Physics, Vol. 47, No. 5, 1976, pp. 2200-2219. doi:10.1063/1.322870

[15]   L. L. Chen, J. Li, Y. Q. Lin, X. D. Liu and D. C. Li, “Surface Modification and Characterization of Gamma-Fe2O3 Nanoparticles Synthesized by Chemically-Induced Transition,” Materials Chemistry and Physics, submitted.

[16]   P. Mathur, A. Thakur and M. Singh, “Effect of Nanoparticles on the Magnetic Properties of Mn-Zn Soft Ferrite,” Journal of Magnetism and Magnetic Materials, Vol. 320, No. 7, 2008, pp. 1364-1369. doi:10.1016/j.jmmm.2007.11.008

[17]   J. Li, C. Liu and Y. Yao, “Study on Preparation of LaAlO3 Particles by Wet Chemical Method,” Journal of the Chinese Ceramic Society, Vol. 22, No. 5, 1994, pp. 504-508.

[18]   H. P. Klug and L. E. Alexander, “X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials,” John Wiley & Sons Inc., New York, 1974, p. 299.