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The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications

Magnetic inductive heating (MIH) has been a topic of great interest because of its potential applications, especially in biomedicine. In this paper, the parameters characteristic for magnetic inductive heating power including maximum specific loss power (SLP(max)), optimal nanoparticle diameter (D(c...

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Autores principales: Nguyen, Luu Huu, Phong, Pham Thanh, Nam, Pham Hong, Manh, Do Hung, Thanh, Nguyen Thi Kim, Tung, Le Duc, Phuc, Nguyen Xuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8070233/
https://www.ncbi.nlm.nih.gov/pubmed/33918815
http://dx.doi.org/10.3390/ma14081875
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author Nguyen, Luu Huu
Phong, Pham Thanh
Nam, Pham Hong
Manh, Do Hung
Thanh, Nguyen Thi Kim
Tung, Le Duc
Phuc, Nguyen Xuan
author_facet Nguyen, Luu Huu
Phong, Pham Thanh
Nam, Pham Hong
Manh, Do Hung
Thanh, Nguyen Thi Kim
Tung, Le Duc
Phuc, Nguyen Xuan
author_sort Nguyen, Luu Huu
collection PubMed
description Magnetic inductive heating (MIH) has been a topic of great interest because of its potential applications, especially in biomedicine. In this paper, the parameters characteristic for magnetic inductive heating power including maximum specific loss power (SLP(max)), optimal nanoparticle diameter (D(c)) and its width (ΔD(c)) are considered as being dependent on magnetic nanoparticle anisotropy (K). The calculated results suggest 3 different Néel-domination (N), overlapped Néel/Brownian (NB), and Brownian-domination (B) regions. The transition from NB- to B-region changes abruptly around critical anisotropy K(c). For magnetic nanoparticles with low K (K < K(c)), the feature of SLP peaks is determined by a high value of D(c) and small ΔD(c) while those of the high K (K > K(c)) are opposite. The decreases of the SLP(max) when increasing polydispersity and viscosity are characterized by different rates of d(SLP(max))/dσ and d(SLP(max))/dη depending on each domination region. The critical anisotropy K(c) varies with the frequency of an alternating magnetic field. A possibility to improve heating power via increasing anisotropy is analyzed and deduced for Fe(3)O(4) magnetic nanoparticles. For MIH application, the monodispersity requirement for magnetic nanoparticles in the B-region is less stringent, while materials in the N- and/or NB-regions are much more favorable in high viscous media. Experimental results on viscosity dependence of SLP for CoFe(2)O(4) and MnFe(2)O(4) ferrofluids are in good agreement with the calculations. These results indicated that magnetic nanoparticles in the N- and/or NB-regions are in general better for application in elevated viscosity media.
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spelling pubmed-80702332021-04-26 The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications Nguyen, Luu Huu Phong, Pham Thanh Nam, Pham Hong Manh, Do Hung Thanh, Nguyen Thi Kim Tung, Le Duc Phuc, Nguyen Xuan Materials (Basel) Article Magnetic inductive heating (MIH) has been a topic of great interest because of its potential applications, especially in biomedicine. In this paper, the parameters characteristic for magnetic inductive heating power including maximum specific loss power (SLP(max)), optimal nanoparticle diameter (D(c)) and its width (ΔD(c)) are considered as being dependent on magnetic nanoparticle anisotropy (K). The calculated results suggest 3 different Néel-domination (N), overlapped Néel/Brownian (NB), and Brownian-domination (B) regions. The transition from NB- to B-region changes abruptly around critical anisotropy K(c). For magnetic nanoparticles with low K (K < K(c)), the feature of SLP peaks is determined by a high value of D(c) and small ΔD(c) while those of the high K (K > K(c)) are opposite. The decreases of the SLP(max) when increasing polydispersity and viscosity are characterized by different rates of d(SLP(max))/dσ and d(SLP(max))/dη depending on each domination region. The critical anisotropy K(c) varies with the frequency of an alternating magnetic field. A possibility to improve heating power via increasing anisotropy is analyzed and deduced for Fe(3)O(4) magnetic nanoparticles. For MIH application, the monodispersity requirement for magnetic nanoparticles in the B-region is less stringent, while materials in the N- and/or NB-regions are much more favorable in high viscous media. Experimental results on viscosity dependence of SLP for CoFe(2)O(4) and MnFe(2)O(4) ferrofluids are in good agreement with the calculations. These results indicated that magnetic nanoparticles in the N- and/or NB-regions are in general better for application in elevated viscosity media. MDPI 2021-04-09 /pmc/articles/PMC8070233/ /pubmed/33918815 http://dx.doi.org/10.3390/ma14081875 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
Nguyen, Luu Huu
Phong, Pham Thanh
Nam, Pham Hong
Manh, Do Hung
Thanh, Nguyen Thi Kim
Tung, Le Duc
Phuc, Nguyen Xuan
The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title_full The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title_fullStr The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title_full_unstemmed The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title_short The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications
title_sort role of anisotropy in distinguishing domination of néel or brownian relaxation contribution to magnetic inductive heating: orientations for biomedical applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8070233/
https://www.ncbi.nlm.nih.gov/pubmed/33918815
http://dx.doi.org/10.3390/ma14081875
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