Tuning dipolar effects on magnetic hyperthermia of Zn0.3Fe2.7O4/SiO2 nanoparticles by silica shell

Tuning dipolar effects on magnetic hyperthermia of Zn0.3Fe2.7O4/SiO2 nanoparticles by silica shell
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通过二氧化硅壳调节 Zn0.3Fe2.7O4/SiO2 纳米颗粒磁热的偶极效应

DOI:
10.1016/j.jmmm.2020.167483
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发表时间:
2021-03
影响因子:
2.7
通讯作者:
Hao Zeng
Hao Zeng
中科院分区:
材料科学3区
文献类型:
--
作者:
Xiang Yu;Lichen Wang;Kai Li;Yan Mi;Zhengrui Li;Di’an Wu;Fan Sun;Shuli He;Hao Zeng

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系统研究了磁偶极相互作用对具有相同磁芯尺寸和不同非磁壳厚度的Zn0.3Fe2.7O4/ sio2核/壳纳米粒子(NPs)比损耗功率(SLP)的影响。在薄硅壳的情况下,由于NPs之间的强偶极相互作用,NPs形成了链状结构。链的形成引起了额外的形状各向异性。随着硅壳厚度的增加,偶极相互作用和偶极相互作用引起的各向异性减小。同时,NPs的水动力尺寸随壳厚的增加而减小,这也是由于相互作用的减少。磁各向异性和水动力尺寸通过n<s:1>和布朗弛豫速率的变化影响SLP,导致薄壳和厚壳NPs的场依赖SLP值不同。
Effects of magnetic dipole interactions on specific loss power (SLP) for Zn0.3Fe2.7O4/SiO2core/shell nanoparticles (NPs) with identical magnetic core size and varying non-magnetic shell thicknesses were systematically investigated. In the case of thin silica shell, NPs form chain-like structures due to strong dipole interactions between NPs. The chain formation induces additional shape anisotropy. With increasing thickness of the silica shell, the dipole interaction and therefore the anisotropy induced by the dipole interactions decrease. Meanwhile, the hydrodynamic size of the NPs shows a counterintuitive reduction with increasing shell thickness, also due to the decrease in interactions. The magnetic anisotropy and hydrodynamic size affect the SLP through changes in the Néel and Brownian relaxation rates, leading to different field-dependent SLP values for NPs with thin and thick shells.
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