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Numerical Model for Determining the Magnetic Loss of Magnetic Fluids

1
Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia
2
Jozef Stefan Institute, 1000 Ljubljana, Slovenia
3
School of Engineering and Physical Science, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(4), 591; https://doi.org/10.3390/ma12040591
Received: 17 December 2018 / Revised: 1 February 2019 / Accepted: 13 February 2019 / Published: 16 February 2019
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Abstract

Magnetic fluid hyperthermia (MFH) is a medical treatment where the temperature in the tissue is increased locally by means of heated magnetic fluid in an alternating magnetic field. In recent years, it has been the subject of a lot of research in the field of Materials, as well as in the field of clinical testing on mice and rats. Magnetic fluid manufacturers aim to achieve three objectives; high heating capacity, biocompatibility and self-regulatory temperature effect. High heating power presents the conversion of magnetic field energy into temperature increase where it is challenging to achieve the desired therapeutic effects in terms of elevated temperature with the smallest possible amount of used material. In order to carry out the therapy, it is primarily necessary to create a fluid and perform calorimetric measurement for determining the Specific Absorption Rate (SAR) or heating power for given parameters of the magnetic field. The article presents a model based on a linear response theory for the calculation of magnetic losses and, consequently, the SAR parameters are based on the physical parameters of the liquid. The calculation model is also validated by calorimetric measurements for various amplitudes, frequencies and shapes of the magnetic field. Such a model can serve to help magnetic fluid developers in the development phase for an approximate assessment of the heating power. View Full-Text
Keywords: magnetic fluid; loss model; specific absorption rate; linear response theory magnetic fluid; loss model; specific absorption rate; linear response theory
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Beković, M.; Trbušić, M.; Gyergyek, S.; Trlep, M.; Jesenik, M.; Szabo, P.S.B.; Hamler, A. Numerical Model for Determining the Magnetic Loss of Magnetic Fluids. Materials 2019, 12, 591.

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