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Descripción
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| Magnetic hyperthermia mediated by superparamagnetic particles is mainly based in sinusoidal waveforms as excitation signals. Temperature changes are conventionally explained by rotation of the particles in the surrounding medium. This is a hypothesis quite questionable since habitual experimental setups only produce changes in the magnetic module, not in the field lines trajectories. Theoretical results were tested by changing the waveform of the exciting signal in order to compare non-sinusoidal signals against sinusoidal signals. Experiments were done at different frequencies: 200 KHz, 400 KHz, 600 KHz, 800 KHz and 1 MHz. Superparamagnetic Iron Oxide samples (SPION), made of magnetite (Fe3O4) and suspended in water (100 mg/ml), were used. Magnetic field strength varies from 0.1 ± 0.015 KA/m to 0.6 ± 0.015 KA/m. In this study was observed that the power loss depends on the applied frequency: for 1 to 2.5 RMS current the responses for each signal are part of the higher section of the exponential function, and for 3.5 to 8 RMS current the response is clearly the decrement exponential function?s tale (under 1 × 103 LER/gr). | |
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Internacional
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No |
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JCR del ISI
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No |
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Título de la revista
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Journal of Magnetics |
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ISSN
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1226-1750 |
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Factor de impacto JCR
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0,42 |
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Información de impacto
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Volumen
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21 |
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DOI
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Número de revista
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Desde la página
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460 |
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Hasta la página
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467 |
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Mes
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SIN MES |
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Ranking
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