The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications.
The Role of Anisotropy in Distinguishing Domination of Néel or Brownian Relaxation Contribution to Magnetic Inductive Heating: Orientations for Biomedical Applications.
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DOI：
10.3390/ma14081875
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发表时间：
2021-04-09
期刊：
影响因子：
--
通讯作者：
Phuc NX
中科院分区：
文献类型：
--
作者：
Nguyen LH;Phong PT;Nam PH;Manh DH;Thanh NTK;Tung LD;Phuc NX
磁感应加热(MIH)由于其潜在的应用，特别是在生物医学方面的应用，一直是人们非常感兴趣的话题。本文认为，磁感应加热功率的参数特性，包括最大比损耗功率(SLPmax)、最佳纳米颗粒直径(DC)和宽度(ΔDC)与磁性纳米颗粒各向异性(K)有关。计算结果表明存在三个不同的Néel支配(N)区、重叠的Néel/Brown区(NB)和Brown支配区(B)。从Nb区到B区的转变在临界各向异性Kc附近发生突变。对于低K(K<；Kc)的磁性纳米粒子，其SLP峰的特征由较高的dc和较小的Δdc决定，而高K(K>；kc)的则相反。随着多分散度和粘度的增加，SLPmax的降低表现为不同控制区的d(SLPmax)/dσ和d(SLPmax)/dη的速率不同。临界各向异性Kc随交变磁场的频率而变化。分析和推导了通过增加Fe3O4磁性纳米粒子的各向异性来提高加热功率的可能性。对于MIH应用，B区对磁性纳米粒子的单分散性要求较低，而N区和/或Nb区的材料在高粘度介质中更有利。CoFe2O4和MnFe2O4磁流体SLP随粘度变化的实验结果与理论计算符合得很好。这些结果表明，N-和/或Nb-区的磁性纳米颗粒通常更适合于高粘度介质中的应用。
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 (SLPmax), optimal nanoparticle diameter (Dc) and its width (ΔDc) 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 Kc. For magnetic nanoparticles with low K (K < Kc), the feature of SLP peaks is determined by a high value of Dc and small ΔDc while those of the high K (K > Kc) are opposite. The decreases of the SLPmax when increasing polydispersity and viscosity are characterized by different rates of d(SLPmax)/dσ and d(SLPmax)/dη depending on each domination region. The critical anisotropy Kc varies with the frequency of an alternating magnetic field. A possibility to improve heating power via increasing anisotropy is analyzed and deduced for Fe3O4 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 CoFe2O4 and MnFe2O4 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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影响因子：
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作者：
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影响因子：
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