Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields
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 dis...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2019-11-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.10.221 |
| _version_ | 1818291303928037376 |
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| author | Nikolai A. Usov Ruslan A. Rytov Vasiliy A. Bautin |
| author_facet | Nikolai A. Usov Ruslan A. Rytov Vasiliy A. Bautin |
| author_sort | Nikolai A. Usov |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T02:41:56Z |
| format | Article |
| id | doaj.art-85313f599f5b4654b9a239bdaa93439a |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-13T02:41:56Z |
| publishDate | 2019-11-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-85313f599f5b4654b9a239bdaa93439a2022-12-22T00:02:17ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862019-11-011012294230310.3762/bjnano.10.2212190-4286-10-221Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fieldsNikolai A. Usov0Ruslan A. Rytov1Vasiliy A. Bautin2National University of Science and Technology «MISIS», 119049, Moscow, RussiaNational University of Science and Technology «MISIS», 119049, Moscow, RussiaNational University of Science and Technology «MISIS», 119049, Moscow, RussiaThe 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.https://doi.org/10.3762/bjnano.10.221magnetic hyperthermiamagnetic nanoparticlesnumerical simulationrotating magnetic fieldspecific absorption rateviscous liquid |
| spellingShingle | Nikolai A. Usov Ruslan A. Rytov Vasiliy A. Bautin Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields Beilstein Journal of Nanotechnology magnetic hyperthermia magnetic nanoparticles numerical simulation rotating magnetic field specific absorption rate viscous liquid |
| title | Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| title_full | Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| title_fullStr | Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| title_full_unstemmed | Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| title_short | Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| title_sort | dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields |
| topic | magnetic hyperthermia magnetic nanoparticles numerical simulation rotating magnetic field specific absorption rate viscous liquid |
| url | https://doi.org/10.3762/bjnano.10.221 |
| work_keys_str_mv | AT nikolaiausov dynamicsofsuperparamagneticnanoparticlesinviscousliquidsinrotatingmagneticfields AT ruslanarytov dynamicsofsuperparamagneticnanoparticlesinviscousliquidsinrotatingmagneticfields AT vasiliyabautin dynamicsofsuperparamagneticnanoparticlesinviscousliquidsinrotatingmagneticfields |