Synthesis and Characterization of Superparamagnetic Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Core-Shell Composite Nanoparticles
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Abstract
The Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> composite nanoparticles were obtained from as-synthesized magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles through the modified Stöber method. Then, the Fe3O4 nanoparticles and Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> composite nanoparticles were characterized by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). Recently, the studies focus on how to improve the dispersion of composite particle and achieve good magnetic performance. Hence effects of the volume ratio of tetraethyl orthosilicate (TEOS) and magnetite colloid on the structural, morphological and magnetic properties of the composite nanoparticles were systematically investi-gated. The results revealed that the Fe3O4@SiO2 had better thermal stability and dispersion than the magnetite nanoparticles. Furthermore, the particle size and magnetic property of the Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> composite nanoparticles can be adjusted by changing the volume ratio of TEOS and magnetite colloid.
- C. Sun, J. S. H. Lee and M. Q. Zhang, “Magnetic Nanoparticles in MR Imaging and Drug Delivery,” Advanced Drug Delivery Reviews, Vol. 60, No. 11, August 2008, pp. 1252-1265. doi:10.1016/j.addr.2008.03.018
- A. K. Gupta and M. Gupta, “Synthesis and Surface Engineering of Iron Oxide Nanoparticles for Biomedical Applications,” Biomaterials, Vol. 26, No. 18, June 2005, pp. 3995-4021. doi:10.1016/j.biomaterials.2004.10.012
- R. Olsvik, T. Popovic, E. Skjerve, K. S. Cudjoe, E. Hornes, J. Ugelstad and M. Uhlen, “Magnetic Separation Techniques in Diagnostic. Microbiology,” Clinical Microbiology Reviews, Vol. 7, No. 1, January 1994, pp. 43- 54.
- M. N. Widjojoatmodjo, A. C. Fluit, R. Torensma and J. Verhoef, “Comparison of Immu-nomagnetic Beads Coated with Protein A, Protein G, or Goat Anti-Mouse Immunoglobulins. Applications in Enzyme Im-munoassays and Immunomagnetic Separations,” Journal of Immunological Methods, Vol. 165, No. 1, 1993, pp. 11-19. doi:10.1016/0022-1759(93)90101-C
- S. Y. Gan and M. Chow, “Carboxyl Group (-CO2H) Functionalized Ferrimagnetic Iron Oxide Nanoparticles for Potential Bio-Applications,” Journal of Materials Chemistry, Vol. 14, No. 18, 2004, pp. 2781-2786. doi:10.1039/b404964k
- A. Kaushik, R. Khan, P. R. So-lanki, P. Pandey, J. Alam, S. Ahmad and B. D. Malhotra, “Iron Oxide Nanoparticles—Chitosan Composite Based Glucose Biosensor,” Biosensors and Bioelectronics, Vol. 24, No. 4, 2008, pp. 676-683. doi:10.1016/j.bios.2008.06.032
- J. Sun, S. B. Zhou, P. Hou, Y. Yang, J. Weng, X. H. Li and M. Y. Li, “Synthesis and Characterization of Biocompatible Fe3O4 Nanoparticles,” Journal of Biomedical Materials Research, Vol. 80A, No. 2, 2006, pp. 333-341.
- M. D. Butterworth, L. Illum, S. S. Davis, “Preparation of Ultrafine Silica- and PEG-Coated Magnetite Particles,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 179, No. 1, 2001, pp. 93-102. doi:10.1016/S0927-7757(00)00633-6
- Q. Xu, X. J. Bian, L. L. Li, X. Y. Hu, M. Sun, D. Chen and Y. Wang, “Myoglobin Immobilized on Fe3O4@SiO2 Magnetic Nanoparticles: Direct Electron Transfer, Enhanced Thermostability and Electroactiv-ity,” Electrochemistry Communications, Vol. 10, No. 7, 2008, pp. 995-999. doi:10.1016/j.elecom.2007.12.002
- T. Tago, T. Hatsuta, K. Miyajima, M. Kishida, S. Tashiro and K. Waka-bayashi, “Novel Synthesis of Silica-Coated Ferrite Nanoparti-cles Prepared Using Water-in-Oil Microemulsion,” Journal of the American Ceramic Society, Vol. 85, No. 9, 2002, pp. 2188-2194. doi:10.1111/j.1151-2916.2002.tb00433.x