Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies

We explored a series of highly uniform magnetic nanoparticles (MNPs) with a core-shell nanoarchitecture prepared by an efficient solvothermal approach. In our study, we focused on the water dispersion of MNPs based on two different CoFe<sub>2</sub>O<sub>4</sub> core sizes and...

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Autores principales:	Shankar Khanal, Marco Sanna Angotzi, Valentina Mameli, Miroslav Veverka, Huolin L. Xin, Carla Cannas, Jana Vejpravová
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	core-shell nanoparticles magnetic fluid hyperthermia frequency dependence time dependence temperature-dependence blocking temperature Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7182d4a3ff084a8eaf4e5c1cab835dc6
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spelling	oai:doaj.org-article:7182d4a3ff084a8eaf4e5c1cab835dc62021-11-25T18:30:20ZSelf-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies10.3390/nano111128482079-4991https://doaj.org/article/7182d4a3ff084a8eaf4e5c1cab835dc62021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2848https://doaj.org/toc/2079-4991We explored a series of highly uniform magnetic nanoparticles (MNPs) with a core-shell nanoarchitecture prepared by an efficient solvothermal approach. In our study, we focused on the water dispersion of MNPs based on two different CoFe<sub>2</sub>O<sub>4</sub> core sizes and the chemical nature of the shell (MnFe<sub>2</sub>O<sub>4</sub> and spinel iron oxide). We performed an uncommon systematic investigation of the time and temperature evolution of the adiabatic heat release at different frequencies of the alternating magnetic field (AMF). Our systematic study elucidates the nontrivial variations in the heating efficiency of core-shell MNPs concerning their structural, magnetic, and morphological properties. In addition, we identified anomalies in the temperature and frequency dependencies of the specific power absorption (SPA). We conclude that after the initial heating phase, the heat release is governed by the competition of the Brown and Néel mechanism. In addition, we demonstrated that a rational parameter sufficiently mirroring the heating ability is the mean magnetic moment per MNP. Our study, thus, paves the road to fine control of the AMF-induced heating by MNPs with fine-tuned structural, chemical, and magnetic parameters. Importantly, we claim that the nontrivial variations of the SPA with the temperature must be considered, e.g., in the emerging concept of MF-assisted catalysis, where the temperature profile influences the undergoing chemical reactions.Shankar KhanalMarco Sanna AngotziValentina MameliMiroslav VeverkaHuolin L. XinCarla CannasJana VejpravováMDPI AGarticlecore-shell nanoparticlesmagnetic fluid hyperthermiafrequency dependencetime dependencetemperature-dependenceblocking temperatureChemistryQD1-999ENNanomaterials, Vol 11, Iss 2848, p 2848 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	core-shell nanoparticles magnetic fluid hyperthermia frequency dependence time dependence temperature-dependence blocking temperature Chemistry QD1-999
spellingShingle	core-shell nanoparticles magnetic fluid hyperthermia frequency dependence time dependence temperature-dependence blocking temperature Chemistry QD1-999 Shankar Khanal Marco Sanna Angotzi Valentina Mameli Miroslav Veverka Huolin L. Xin Carla Cannas Jana Vejpravová Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
description	We explored a series of highly uniform magnetic nanoparticles (MNPs) with a core-shell nanoarchitecture prepared by an efficient solvothermal approach. In our study, we focused on the water dispersion of MNPs based on two different CoFe<sub>2</sub>O<sub>4</sub> core sizes and the chemical nature of the shell (MnFe<sub>2</sub>O<sub>4</sub> and spinel iron oxide). We performed an uncommon systematic investigation of the time and temperature evolution of the adiabatic heat release at different frequencies of the alternating magnetic field (AMF). Our systematic study elucidates the nontrivial variations in the heating efficiency of core-shell MNPs concerning their structural, magnetic, and morphological properties. In addition, we identified anomalies in the temperature and frequency dependencies of the specific power absorption (SPA). We conclude that after the initial heating phase, the heat release is governed by the competition of the Brown and Néel mechanism. In addition, we demonstrated that a rational parameter sufficiently mirroring the heating ability is the mean magnetic moment per MNP. Our study, thus, paves the road to fine control of the AMF-induced heating by MNPs with fine-tuned structural, chemical, and magnetic parameters. Importantly, we claim that the nontrivial variations of the SPA with the temperature must be considered, e.g., in the emerging concept of MF-assisted catalysis, where the temperature profile influences the undergoing chemical reactions.
format	article
author	Shankar Khanal Marco Sanna Angotzi Valentina Mameli Miroslav Veverka Huolin L. Xin Carla Cannas Jana Vejpravová
author_facet	Shankar Khanal Marco Sanna Angotzi Valentina Mameli Miroslav Veverka Huolin L. Xin Carla Cannas Jana Vejpravová
author_sort	Shankar Khanal
title	Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title_short	Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title_full	Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title_fullStr	Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title_full_unstemmed	Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title_sort	self-limitations of heat release in coupled core-shell spinel ferrite nanoparticles: frequency, time, and temperature dependencies
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7182d4a3ff084a8eaf4e5c1cab835dc6
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Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies

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