Abstract—Superparamagnetic particles find a great situation in a large number of science. Despite high number of research in the field of magnetic nanoparticle production, there are some drawbacks regarding this kind of materials. In this study in order to overcome some of these drawbacks, nano-sized magnetite fine powder was produced via coprecipitation method under N2 atmosphere by modification of two significant parameters, alkaline media concentration and temperature. Effect of named parameters on the particle size, size distribution was analyzed by transmission electron microscopy (TEM), and in order to evaluate magnetic behaviour of particles, vibrating sample magnetometry (VSM) was used. Crystalline phase of synthesized material were determined by means of X-ray diffraction spectroscopy (XRD). As authors know, there is not any evidence of evaluation of sample synthesized at room temperature for a short period of time and then post modification at higher temperature on particle size and its magnetic properties. Results show the particles synthesized at elevated temperature (70°C) and lower alkaline concentration (0.9 M) have highest saturation magnetization, about 68 emu/gr at 70°C, compared with 63 emu/gr at 25°C and smallest particle size. On the base of our experimental data we can introduce a modification way for copercipitation method which improves the magnetic properties with reduction of particle size at the same time.
Index Terms—Alkaline media concentration, magnetite, particle size reduction, temperature.
M. Tajabadi is with University of Technology, Faculty of Biomedical Eng., Biomaterial Group, Laser and Nanobiophotonics Lab, Amirkabir University of Technology, Tehran, Iran (e-mail: m.tajabadi@aut.ac.ir).
M. E. Khosroshahi is with Amirkabir University of Technology, Faculty of Biomedical Eng., Biomaterial Group, Laser and Nanobiophotonics Lab, Tehran, Iran and Amirkabir University of Technology, Laser, Optic Reaserch Center, Tehran, Iran (e-mail: khosro@aut.ac.ir).
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Cite: M. Tajabadi and M. E. Khosroshahi, "Effect of Alkaline Media Concentration and Modification of Temperature on Magnetite Synthesis Method Using FeSO4/NH4OH," International Journal of Chemical Engineering and Applications vol. 3, no. 3, pp. 206-210 , 2012.
