Properties of assembly of superparamagnetic nanoparticles in viscous liquid

Abstract Detailed calculations of the specific absorption rate (SAR) of a dilute assembly of iron oxide nanoparticles with effective uniaxial anisotropy dispersed in a liquid are performed depending on the particle diameters, the alternating (ac) magnetic field amplitude H 0 and the liquid viscosity...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	N. A. Usov, R. A. Rytov, V. A. Bautin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/050e0277cf2b41e783eb3ee234aba3eb
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:050e0277cf2b41e783eb3ee234aba3eb
record_format	dspace
spelling	oai:doaj.org-article:050e0277cf2b41e783eb3ee234aba3eb2021-12-02T16:35:57ZProperties of assembly of superparamagnetic nanoparticles in viscous liquid10.1038/s41598-021-86323-x2045-2322https://doaj.org/article/050e0277cf2b41e783eb3ee234aba3eb2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86323-xhttps://doaj.org/toc/2045-2322Abstract Detailed calculations of the specific absorption rate (SAR) of a dilute assembly of iron oxide nanoparticles with effective uniaxial anisotropy dispersed in a liquid are performed depending on the particle diameters, the alternating (ac) magnetic field amplitude H 0 and the liquid viscosity. For small and moderate H 0 values with respect to particle anisotropy field H k the SAR of the assembly as a function of the particle diameter passes through a characteristic maximum and then reaches a plateau, whereas for sufficiently large amplitudes, H 0 ~ H k , the SAR increases monotonically as a function of diameter. The realization of viscous and magnetic oscillation modes for particle unit magnetization vector and director for moderate and sufficiently large H 0 values, respectively, explains this behavior. It is found that the SAR of the assembly changes inversely with the viscosity only in a viscous mode, for nanoparticles of sufficiently large diameters. In the magnetic mode the SAR of the assembly is practically independent of the viscosity, since in this case the nanoparticle director only weakly oscillates around the ac magnetic field direction. The conditions for the validity of the linear response theory have been clarified by comparison with the numerical simulation data.N. A. UsovR. A. RytovV. A. BautinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q N. A. Usov R. A. Rytov V. A. Bautin Properties of assembly of superparamagnetic nanoparticles in viscous liquid
description	Abstract Detailed calculations of the specific absorption rate (SAR) of a dilute assembly of iron oxide nanoparticles with effective uniaxial anisotropy dispersed in a liquid are performed depending on the particle diameters, the alternating (ac) magnetic field amplitude H 0 and the liquid viscosity. For small and moderate H 0 values with respect to particle anisotropy field H k the SAR of the assembly as a function of the particle diameter passes through a characteristic maximum and then reaches a plateau, whereas for sufficiently large amplitudes, H 0 ~ H k , the SAR increases monotonically as a function of diameter. The realization of viscous and magnetic oscillation modes for particle unit magnetization vector and director for moderate and sufficiently large H 0 values, respectively, explains this behavior. It is found that the SAR of the assembly changes inversely with the viscosity only in a viscous mode, for nanoparticles of sufficiently large diameters. In the magnetic mode the SAR of the assembly is practically independent of the viscosity, since in this case the nanoparticle director only weakly oscillates around the ac magnetic field direction. The conditions for the validity of the linear response theory have been clarified by comparison with the numerical simulation data.
format	article
author	N. A. Usov R. A. Rytov V. A. Bautin
author_facet	N. A. Usov R. A. Rytov V. A. Bautin
author_sort	N. A. Usov
title	Properties of assembly of superparamagnetic nanoparticles in viscous liquid
title_short	Properties of assembly of superparamagnetic nanoparticles in viscous liquid
title_full	Properties of assembly of superparamagnetic nanoparticles in viscous liquid
title_fullStr	Properties of assembly of superparamagnetic nanoparticles in viscous liquid
title_full_unstemmed	Properties of assembly of superparamagnetic nanoparticles in viscous liquid
title_sort	properties of assembly of superparamagnetic nanoparticles in viscous liquid
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/050e0277cf2b41e783eb3ee234aba3eb
work_keys_str_mv	AT nausov propertiesofassemblyofsuperparamagneticnanoparticlesinviscousliquid AT rarytov propertiesofassemblyofsuperparamagneticnanoparticlesinviscousliquid AT vabautin propertiesofassemblyofsuperparamagneticnanoparticlesinviscousliquid
_version_	1718383673573638144

Properties of assembly of superparamagnetic nanoparticles in viscous liquid

Ejemplares similares