Heating of Aqueous Dispersions Containing MnFe2O4 Nanoparticles by Radio-Frequency Magnetic Field Induction

Dong Hyun Kim, Ynhi T. Thai, David E. Nikles, Christopher S. Brazel

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Our interest in identifying magnetic nanoparticles for magnetic hyperthermia therapy has led to this study of the ac magnetic field induced heating of MnFe2O4 nanoparticles. Single-crystal MnFe 2O4 nanoparticles with diameters ranging from 5.3 to 12.1 nm were synthesized by a thermal decomposition method. Oleic acid and oleylamine ligands used during synthesis were replaced by meso-2,3-dimercaptosuceinic acid, which allowed the particles to be dispersed in water. Magnetic field induction heating of aqueous dispersions of the particles showed that the value of specific absorption rate (SAR) increased with increasing particle size until it peaked for particles with an average diameter of 10.5 nm and then decreased for particles with an average diameter of 12.1 mn. Theoretical calculations of the effect of particle size on the heat generation were in agreement with this trend and showed that, with the largest particles, there was a decrease in the contribution of Brownian relaxation to the heating, leading to a decrease in the SAR for these particles.

Original languageEnglish (US)
Article number4760209
Pages (from-to)64-70
Number of pages7
JournalIEEE Transactions on Magnetics
Volume45
Issue number1
DOIs
StatePublished - Jan 1 2009

Keywords

  • Hyperthermia
  • Magnetic nanoparticles
  • MnFeO
  • Multifunctional nanoparticles
  • Specific absorption rate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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