Abstract
Magnetite nanoparticles with super-paramagnetic properties have great potential to achieve advances in fields such as hyperthermia, magnetic resonance imaging and magnetic drug targeting. In particular, magnetic particles less than 50 nm are easily incorporated into cells and generate heat under an alternating magnetic field by hysteresis loss. Various methods of preparing magnetic particles have attracted attention, such as spray pyrolysis, microwave irradiation of ferrous hydroxide, microemulsion technique and hydrothermial preparation technique. In this study, magnetite nanoparticles were synthesized with various molar ratio of Fe2+ and Fe3+ by coprecipitation using spray-guns and dropping syringe. Experiments at different molar concentrations of Fe ions were conducted, which shows the ideal molar concentration of Fe2+ to be 0.5 M for pure magnetite. Both in the spray and drop method, pure magnetite nanoparticles could be synthesized when the molar concentration of Fe2+ was 0.5 M. With increasing the molar ratio of Fe2+, the particle size of the magnetite nanoparticles was increased. The smallest size could be reduced to approximately 7 nm by the spray method. The shape of the synthesized nanoparticles was nearly spherical. The calculated highest loss power by hysteresis losses was 597 W/g, generated with a molar concentration ratio of 0.5:1 (Fe2+:Fe3+).
Similar content being viewed by others
References
Pulfer SK, Gallo JM (1997) Scientific and clinical applications of magnetic carriers. Plenum Press, New York, p 445
Kim DK, Zhang Y, Voit W, Rao KV, Muhammed M (2001) J Magn Magn Mater 225:30
Shinkai M, Yanase M, Suzuki M, Honda H, Wakabayashi T, Yoshida J, Kobayashi T (1999) J Magn Magn Mater 194:176
Gonzalez-Catteno T, Morales MP (1993) Mater Lett 18:151
Dong D, Hong P (1995) Mater Res Bull 30:537
Deng Y, Wang L, Yang W, Fu S, Elaïssari A (1999) J Magn Magn Mater 194:254
Li Y, Liao H, Qian Y (1998) Mater Res Bull 33:841
Dawson WJ (1989) Am Ceram Soc Bull 67(10):1673
Thapa D, Palkar VR, Kurup MB, Malik SK (2004) Mater Lett 58:2692
Massart R (1981) IEEE Tran Magn MAG-17:1247
Hergt R, Andra W, Carl GD, Hilger I, Kaiser WA, Richter U, Schmidt HG (1998) IEEE Trans Magn 34:3745
Qu S, Yang H, Ren D, Kan S, Zou G, Li D, Li M (1999) J Colloid Interf Sci 215:190
Acknowledgement
This work was supported by grant No. R13-2003-13 from the Medical Science and Engineering Research Program of the Korea Science & Engineering Foundation.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, DH., Kim, KN., Kim, KM. et al. Tuning of magnetite nanoparticles to hyperthermic thermoseed by controlled spray method. J Mater Sci 41, 7279–7282 (2006). https://doi.org/10.1007/s10853-006-0952-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-006-0952-4