Nanoscale Brownian heating by interacting magnetic dipolar particles

Abstract Clusters of magnetic nanoparticles have received considerable interest in various research fields. Their capacity to generate heat under an alternating magnetic field has recently opened the way to applications such as cancer therapy by hyperthermia. This work is an attempt to investigate t...

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Autores principales:	Yann Chalopin, Jean-Claude Bacri, Florence Gazeau, Martin Devaud
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b6d322fa37b64facbaf5ec3d999dbf0e
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spelling	oai:doaj.org-article:b6d322fa37b64facbaf5ec3d999dbf0e2021-12-02T15:05:21ZNanoscale Brownian heating by interacting magnetic dipolar particles10.1038/s41598-017-01760-x2045-2322https://doaj.org/article/b6d322fa37b64facbaf5ec3d999dbf0e2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01760-xhttps://doaj.org/toc/2045-2322Abstract Clusters of magnetic nanoparticles have received considerable interest in various research fields. Their capacity to generate heat under an alternating magnetic field has recently opened the way to applications such as cancer therapy by hyperthermia. This work is an attempt to investigate the collective effects of interacting dipoles embedded in magnetic nano-particles (MNP) to predict their thermal dissipation with a liquid. We first present a general approach, based on the tracking of the microscopic dipole fluctuations, to access to the dissipation spectra of any spatial distribution of MNPs. Without any other assumption that the linear response regime, it is shown that increasing the particle concentration (dipolar interactions) dramatically diminishes and blueshifts the dissipation processes. This effect originates in a predominance of the coupling energy over the Brownian torques, which create a long-range ordering that saturates the response of the system to an external field. Consequently, the particle density is of fundamental importance to the control of the absorption of electromagnetic energy and its subsequent dissipation in the form of heat.Yann ChalopinJean-Claude BacriFlorence GazeauMartin DevaudNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yann Chalopin Jean-Claude Bacri Florence Gazeau Martin Devaud Nanoscale Brownian heating by interacting magnetic dipolar particles
description	Abstract Clusters of magnetic nanoparticles have received considerable interest in various research fields. Their capacity to generate heat under an alternating magnetic field has recently opened the way to applications such as cancer therapy by hyperthermia. This work is an attempt to investigate the collective effects of interacting dipoles embedded in magnetic nano-particles (MNP) to predict their thermal dissipation with a liquid. We first present a general approach, based on the tracking of the microscopic dipole fluctuations, to access to the dissipation spectra of any spatial distribution of MNPs. Without any other assumption that the linear response regime, it is shown that increasing the particle concentration (dipolar interactions) dramatically diminishes and blueshifts the dissipation processes. This effect originates in a predominance of the coupling energy over the Brownian torques, which create a long-range ordering that saturates the response of the system to an external field. Consequently, the particle density is of fundamental importance to the control of the absorption of electromagnetic energy and its subsequent dissipation in the form of heat.
format	article
author	Yann Chalopin Jean-Claude Bacri Florence Gazeau Martin Devaud
author_facet	Yann Chalopin Jean-Claude Bacri Florence Gazeau Martin Devaud
author_sort	Yann Chalopin
title	Nanoscale Brownian heating by interacting magnetic dipolar particles
title_short	Nanoscale Brownian heating by interacting magnetic dipolar particles
title_full	Nanoscale Brownian heating by interacting magnetic dipolar particles
title_fullStr	Nanoscale Brownian heating by interacting magnetic dipolar particles
title_full_unstemmed	Nanoscale Brownian heating by interacting magnetic dipolar particles
title_sort	nanoscale brownian heating by interacting magnetic dipolar particles
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b6d322fa37b64facbaf5ec3d999dbf0e
work_keys_str_mv	AT yannchalopin nanoscalebrownianheatingbyinteractingmagneticdipolarparticles AT jeanclaudebacri nanoscalebrownianheatingbyinteractingmagneticdipolarparticles AT florencegazeau nanoscalebrownianheatingbyinteractingmagneticdipolarparticles AT martindevaud nanoscalebrownianheatingbyinteractingmagneticdipolarparticles
_version_	1718388853509718016

Nanoscale Brownian heating by interacting magnetic dipolar particles

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