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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MDPI AG
2021-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/11/2848 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T05:12:55Z |
| format | Article |
| id | doaj.art-7182d4a3ff084a8eaf4e5c1cab835dc6 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T05:12:55Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-7182d4a3ff084a8eaf4e5c1cab835dc62023-11-23T00:39:19ZengMDPI AGNanomaterials2079-49912021-10-011111284810.3390/nano11112848Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature DependenciesShankar Khanal0Marco Sanna Angotzi1Valentina Mameli2Miroslav Veverka3Huolin L. Xin4Carla Cannas5Jana Vejpravová6Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech RepublicDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, CA, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, CA, ItalyDepartment of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech RepublicDepartment of Physics and Astronomy, University of California, Irvine, CA 92617, USADepartment of Chemical and Geological Sciences, University of Cagliari, S.S. 554 bivio per Sestu, 09042 Monserrato, CA, ItalyDepartment of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech RepublicWe 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.https://www.mdpi.com/2079-4991/11/11/2848core-shell nanoparticlesmagnetic fluid hyperthermiafrequency dependencetime dependencetemperature-dependenceblocking temperature |
| spellingShingle | 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 Nanomaterials core-shell nanoparticles magnetic fluid hyperthermia frequency dependence time dependence temperature-dependence blocking temperature |
| 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 | core-shell nanoparticles magnetic fluid hyperthermia frequency dependence time dependence temperature-dependence blocking temperature |
| url | https://www.mdpi.com/2079-4991/11/11/2848 |
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