Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 46, Issue 4, Pages 1043-1051Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2009.2038272
Keywords
Hyperthermia; induction heating; magnetic liquids; magnetic losses; superparamagnetic particles
Funding
- National Natural Science Foundation of China [30571779, 10775085]
- Beijing Municipal Science and Technology Commission [Z07000200540704]
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The induction heating of magnetic fluids for magnetic induction hyperthermia treatments is theoretically analyzed, with regard to the influences by magnetic field parameters, material properties, and demagnetizing field effects in finite-size samples. A monodispersion model of noninteracting superparamagnetic particles, subjected to a magnetic field of the intensity h(ex) < kAm(-1) and frequency f < 1 MHz, is used for the analysis. Calculation results show that the induction heating has a quasi-linear dependence on field intensity and a quasi-negative exponential dependence on field frequency. As for the influences by material parameters, respectively, the induction heating has a double-exponential-like dependence on the magnetic core size and a negative dependence on the coating layer thickness of the superparamagnetic particles. Similarly, the heating dependence on the carrier liquid viscosity is also a double-exponential-like relationship. Besides, the induction heating has a linear dependence on the volume fraction of the superparamagnetic particles, and a negative dependence on the demagnetizing factors, which are related to the sample shapes and orientations. Initial experiments are performed for validating the analytical calculation results.
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