Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields
| Autor: | N. A. Usov, Ruslan A. Rytov, V.A. Bautin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
magnetic nanoparticles
Materials science General Physics and Astronomy Viscous liquid lcsh:Chemical technology lcsh:Technology Full Research Paper Magnetization Nanotechnology lcsh:TP1-1185 General Materials Science magnetic hyperthermia Electrical and Electronic Engineering lcsh:Science Rotating magnetic field Condensed matter physics lcsh:T viscous liquid rotating magnetic field lcsh:QC1-999 Magnetic field Nanoscience Magnetic hyperthermia Amplitude specific absorption rate numerical simulation Particle Magnetic nanoparticles lcsh:Q lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 10, Iss 1, Pp 2294-2303 (2019) Beilstein Journal of Nanotechnology |
| ISSN: | 2190-4286 |
| DOI: | 10.3762/bjnano.10.221 |
| Popis: | The dynamics of magnetic nanoparticles in a viscous liquid in a rotating magnetic field has been studied by means of numerical simulations and analytical calculations. In the magneto-dynamics approximation three different modes of motion of the unit magnetization vector and particle director are distinguished depending on frequency and amplitude of the rotating magnetic field. The specific absorption rate of a dilute assembly of superparamagnetic nanoparticles in rotating magnetic field is calculated by solving the Landau–Lifshitz stochastic equation for the unit magnetization vector and the stochastic equation for the particle director. At elevated frequencies an optimal range of particle diameters is found where the specific absorption rate of an assembly in a rotating magnetic field has a maximum. It is shown that with an optimal choice of the particle sizes sufficiently large SAR values of the order of 400–500 W/g can be obtained in a rotating magnetic field with a frequency f = 400 kHz and a moderate magnetic field amplitude H0 = 100 Oe. |
| Databáze: | OpenAIRE |
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