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Article

Thermal Traits of MNPs under High-Frequency Magnetic Fields: Disentangling the Effect of Size and Coating

1
Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
2
J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
*
Authors to whom correspondence should be addressed.
Academic Editor: Vasileios Tzitzios
Nanomaterials 2021, 11(3), 797; https://doi.org/10.3390/nano11030797
Received: 19 February 2021 / Revised: 14 March 2021 / Accepted: 17 March 2021 / Published: 19 March 2021
(This article belongs to the Special Issue Synthesis, Development and Characterization of Magnetic Nanomaterials)
We investigated the heating abilities of magnetic nanoparticles (MNPs) in a high-frequency magnetic field (MF) as a function of surface coating and size. The cobalt ferrite MNPs were obtained by a hydrothermal method in a water–oleic acid–ethanol system, yielding MNPs with mean diameter of about 5 nm, functionalized with the oleic acid. By applying another cycle of hydrothermal synthesis, we obtained MNPs with about one nm larger diameter. In the next step, the oleic acid was exchanged for 11-maleimidoundecanoic acid or 11-(furfurylureido)undecanoic acid. For the heating experiments, all samples were dispersed in the same solvent (dichloroethane) in the same concentration and the heating performance was studied in a broad interval of MF frequencies (346–782 kHz). The obtained results enabled us to disentangle the impact of the hydrodynamic, structural, and magnetic parameters on the overall heating capabilities. We also demonstrated that the specific power absorption does not show a monotonous trend within the series in the investigated interval of temperatures, pointing to temperature-dependent competition of the Brownian and Néel contributions in heat release. View Full-Text
Keywords: magnetic nanoparticles; specific power absorption; magnetic fluid hyperthermia; surface coating; squid magnetometry; effective magnetic anisotropy magnetic nanoparticles; specific power absorption; magnetic fluid hyperthermia; surface coating; squid magnetometry; effective magnetic anisotropy
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MDPI and ACS Style

Aurélio, D.; Mikšátko, J.; Veverka, M.; Michlová, M.; Kalbáč, M.; Vejpravová, J. Thermal Traits of MNPs under High-Frequency Magnetic Fields: Disentangling the Effect of Size and Coating. Nanomaterials 2021, 11, 797. https://doi.org/10.3390/nano11030797

AMA Style

Aurélio D, Mikšátko J, Veverka M, Michlová M, Kalbáč M, Vejpravová J. Thermal Traits of MNPs under High-Frequency Magnetic Fields: Disentangling the Effect of Size and Coating. Nanomaterials. 2021; 11(3):797. https://doi.org/10.3390/nano11030797

Chicago/Turabian Style

Aurélio, David, Jiří Mikšátko, Miroslav Veverka, Magdalena Michlová, Martin Kalbáč, and Jana Vejpravová. 2021. "Thermal Traits of MNPs under High-Frequency Magnetic Fields: Disentangling the Effect of Size and Coating" Nanomaterials 11, no. 3: 797. https://doi.org/10.3390/nano11030797

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