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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...

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Autores principales: Usov, Nikolai A, Rytov, Ruslan A, Bautin, Vasiliy A
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880845/
https://www.ncbi.nlm.nih.gov/pubmed/31807414
http://dx.doi.org/10.3762/bjnano.10.221
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author Usov, Nikolai A
Rytov, Ruslan A
Bautin, Vasiliy A
author_facet Usov, Nikolai A
Rytov, Ruslan A
Bautin, Vasiliy A
author_sort Usov, Nikolai A
collection PubMed
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 H(0) = 100 Oe.
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spelling pubmed-68808452019-12-05 Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields Usov, Nikolai A Rytov, Ruslan A Bautin, Vasiliy A Beilstein J Nanotechnol Full Research Paper 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 H(0) = 100 Oe. Beilstein-Institut 2019-11-22 /pmc/articles/PMC6880845/ /pubmed/31807414 http://dx.doi.org/10.3762/bjnano.10.221 Text en Copyright © 2019, Usov et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Usov, Nikolai A
Rytov, Ruslan A
Bautin, Vasiliy A
Dynamics of superparamagnetic nanoparticles in viscous liquids in rotating magnetic fields
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 Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880845/
https://www.ncbi.nlm.nih.gov/pubmed/31807414
http://dx.doi.org/10.3762/bjnano.10.221
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