Tuning of magnetite nanoparticles to hyperthermic thermoseed by controlled spray method

Dong Hyun Kim, Kyoung Nam Kim, Kwang Mahn Kim, In Bo Shim, Myung Hyun Lee, Yong Keun Lee

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5 Citations (Scopus)


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+).

Original languageEnglish
Pages (from-to)7279-7282
Number of pages4
JournalJournal of Materials Science
Issue number22
Publication statusPublished - 2006 Nov

Bibliographical note

Funding Information:
Fig. 3 TEM images and ED patterns of magnetite prepared by (a) spray method and (b) drop method (Fe2+ = 0.5 M) 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.

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Ceramics and Composites
  • Mechanical Engineering
  • Polymers and Plastics
  • Materials Science(all)
  • Materials Science (miscellaneous)


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