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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:27 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Solid State Physics and Materials Science
Title:
A new approach for the correct evaluation of SARs in ferrofluids
Authors:
N.Iacob (1,3), G.Schinteie (2), D. Toader (1,3), A. Leca (2), V.Kuncser (2)
Affiliation:
(1)National Institute for Laser, Plasma and Radiation Physics, 077125, Bucharest, Romania
(2) National Institute of Materials Physics, PO Box MG-7, 077125 Bucharest-Magurele, Romania
(3) University of Bucharest, Faculty of Physics, 077125, Bucharest, Romania
E-mail
niacob_ro@yahoo.com
Keywords:
magnetic hyperthermia, magnetic nanoparticles, magnetic anisotropy
Abstract:
A special attention was given in the last period to use of magnetic nanoparticles in cancer hyperthermia. The magnetic hyperthermia implies the biocompatibility of the human body with both the type and content of nanoparticles and in this respect, magnetite nanoparticles at low concentration is the most appropriate solution. Because the intensity of the applied magnetic field should be not to high, in order to avoid unwanted secondary effects, the magnetic properties of the nanoparticle system should be very carefully designed. Therefore, it is very important to assess the thermal response of these nanoparticles relative to their magnetic behavior under ac magnetic field excitations. The shape and size distribution as well the phase content involving specific anisotropy parameters are all very important. Starting from specific literature on magnetic relaxation phenomena estimated the specific absorption rate as function of some temperature-dependent physical parameters such Neel and Brownian relaxation times and the vascosity of the dispersive medium. Experimental heating and cooling slopes versus temperature were obtained for magnetite ferrofluide samples under the excitation of an RF magnetic field. Finally, a potential methodology for the evaluation of the specific absorption rate (SAR) from real experimental data taking into account also environmental loss factors, was proposed.
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