Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 13, Pages 1947-1950Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.12.017
Keywords
Magnetic fluid hyperthermia; Nanoparticle; Magnetic relaxation; Superparmagnetism
Funding
- NSF/DMR [050142]
- National Physical Science Consortium
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Using the thermal decomposition of organometallics method we have synthesized high-quality, iron oxide nanoparticles of tailorable size up to similar to 15 nm and transferred them to a water phase by coating with a biocompatible polymer. The magnetic behavior of these particles was measured and fit to a log-normal distribution using the Chantrell method and their polydispersity was confirmed to be very narrow. By performing calorimetry measurements with these monodisperse particles we have unambiguously demonstrated, for the first time, that at a given frequency, heating rates of superparamagnetic particles are dependent on particle size, in agreement with earlier theoretical predictions. (C) 2008 Published by Elsevier B. V.
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