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Magnetic nanoparticle heating efficiency reveals magneto-structural differences when characterized with wide ranging and high amplitude alternating magnetic fields

Bordelon, David E., Cornejo, Christine, Grüttner, Cordula, Westphal, Fritz, DeWeese, Theodore L., Ivkov, Robert·2011·Journal of Applied Physics
DOI 10.1063/1.3597820
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Abstract

Magnetic nanoparticles can create heat that can be exploited to treat cancer when they are exposed to alternating magnetic fields (AMF). At a fixed frequency, the particle heating efficiency or specific power loss (SPL) depends upon the magnitude of the AMF. We characterized the amplitude-dependent SPL of three commercial dextran-iron oxide nanoparticle suspensions through saturation to 94 kA/m with a calorimeter comprising a solenoid coil that generates a uniform field to 100 kA/m at ∼150 kHz. We also describe a novel method to empirically determine the appropriate range of the heating curve from which the SPL is then calculated. These results agree with SPL values calculated from the phenomenological Box-Lucas equation. We note that the amplitude-dependent SPL among the samples was markedly different, indicating significant magneto-structural variation not anticipated by current models.

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Metadata

Authors
Bordelon, D. E., Cornejo, C., Grüttner, C., Westphal, F., DeWeese, T. L., & Ivkov, R.
Affiliations
  • Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine 1 , Baltimore, Maryland, USA
  • Micromod Partikeltechnologie, GmbH 2 , Rostock, Germany
Venue
Journal of Applied Physics
Publisher
AIP Publishing
Published
2011-06-15
Volume
109
Issue
12
ISSN
  • 0021-8979
  • 1089-7550
DOI
10.1063/1.3597820
Cited by
142
References
0
Language
en

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