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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(2)O(4) core sizes and the chemical nature of the shell (MnFe(2)...

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Autores principales: Khanal, Shankar, Sanna Angotzi, Marco, Mameli, Valentina, Veverka, Miroslav, Xin, Huolin L., Cannas, Carla, Vejpravová, Jana
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8624666/
https://www.ncbi.nlm.nih.gov/pubmed/34835613
http://dx.doi.org/10.3390/nano11112848
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author Khanal, Shankar
Sanna Angotzi, Marco
Mameli, Valentina
Veverka, Miroslav
Xin, Huolin L.
Cannas, Carla
Vejpravová, Jana
author_facet Khanal, Shankar
Sanna Angotzi, Marco
Mameli, Valentina
Veverka, Miroslav
Xin, Huolin L.
Cannas, Carla
Vejpravová, Jana
author_sort Khanal, Shankar
collection PubMed
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(2)O(4) core sizes and the chemical nature of the shell (MnFe(2)O(4) 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.
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spelling pubmed-86246662021-11-27 Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies Khanal, Shankar Sanna Angotzi, Marco Mameli, Valentina Veverka, Miroslav Xin, Huolin L. Cannas, Carla Vejpravová, Jana Nanomaterials (Basel) Article 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(2)O(4) core sizes and the chemical nature of the shell (MnFe(2)O(4) 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. MDPI 2021-10-26 /pmc/articles/PMC8624666/ /pubmed/34835613 http://dx.doi.org/10.3390/nano11112848 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Khanal, Shankar
Sanna Angotzi, Marco
Mameli, Valentina
Veverka, Miroslav
Xin, Huolin L.
Cannas, Carla
Vejpravová, Jana
Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8624666/
https://www.ncbi.nlm.nih.gov/pubmed/34835613
http://dx.doi.org/10.3390/nano11112848
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