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Study of Heating Efficiency as a Function of Concentration, Size, and Applied Field in γ-Fe2O3 Nanoparticles

de la Presa, P., Luengo, Y., Multigner, M., Costo, R., Morales, M. P., Rivero, G., Hernando, A.·2012·The Journal of Physical Chemistry C
DOI 10.1021/jp310771p
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Abstract

The specific absorption rate (SAR) of γ-Fe 2 O 3 nanoparticles (NPs) under an alternating magnetic field has been investigated as a function of size, concentration, coating, liquid carrier, and frequency and amplitude of the applied magnetic field. The NPs have been synthesized by coprecipitation method with sizes ranging from 6 to 14 nm with low polydispersity (0.2) and high crystallinity degrees. The small NPs size (6–14 nm) and the value of the maximum applied field (<7.5 kA/m) allow the use of the linear response theory for the analysis of the experimental SARs values. Under this condition, Neel–Brown relaxation times of about 10 –7 s are obtained from SAR field frequency dependence. The NPs have been immobilized in agar to investigate the heating mechanisms, i.e., inversion of the magnetic moments inside the monodomain volume or particle rotation. The results suggest that there is a critical size of around 12 nm for obtaining the most effective heating in viscous media. Furthermore, the surface modification by aminopropylsilane coating does not affect the heating efficiency, making these NPs good candidates for hyperthermia treatment as well as model samples for standardization of hyperthermia apparatus.

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Metadata

Authors
de la Presa, P., Luengo, Y., Multigner, M., Costo, R., Morales, M. P., Rivero, G., & Hernando, A.
Affiliations
  • Instituto de Magnetismo Aplicado (UCM-ADIF-CSIC), P.O. Box 155, Las Rozas, Madrid 28230, Spain
  • Departamento de Biomateriales y Materiales Bioinspirados, Instituto de Ciencia de Materiales de Madrid/CSIC, Sor Juana Inés de la Cruz 3, Campus de Cantoblanco, Madrid 28049, Spain
Venue
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Published
2012-11-20
Volume
116
Issue
48
Pages
25602-25610
ISSN
  • 1932-7447
  • 1932-7455
DOI
10.1021/jp310771p
Cited by
317
References
2
Language
en

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