The role of dipole interactions in hyperthermia heating colloidal clusters of densely-packed superparamagnetic nanoparticles.
The role of dipole interactions in hyperthermia heating colloidal clusters of densely-packed superparamagnetic nanoparticles.
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DOI：
10.1038/s41598-018-23225-5
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发表时间：
2018-03-16
影响因子：
4.6
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Fu R;Yan Y;Roberts C;Liu Z;Chen Y
这项工作旨在研究粒子间偶极相互作用对低场强下密集排列的Fe₃O₄纳米粒子热疗加热胶体团簇的影响。采用乳液液滴溶剂蒸发法将油酸修饰的Fe₃O₄粒子组装成紧密的团簇，这些团簇在水中由表面活性剂稳定。通过实验和模拟研究了不同团簇尺寸下的加热性能。只有当团簇足够小，能使团簇形状各向异性增强时，偶极相互作用才会提高加热效果。随着团簇尺寸增大，形状各向异性降低，因为团簇的形状变得越来越球形。因此，在较大尺寸时，偶极相互作用会改变并降低加热效率。当团簇形状完全各向同性时，无论团簇尺寸如何，加热效率都低于无相互作用的粒子，尽管在特定尺寸下效率可能会因偶极耦合而略有提高。在这些情况下，必须使用具有更高磁各向异性和/或饱和磁化强度的粒子来提高加热效果。
This work aims to investigate the influence of inter-particle dipole interactions on hyperthermia heating colloidal clusters of densely-packed Fe3O4 nanoparticles at low field intensity. Emulsion droplet solvent evaporation method was used to assemble oleic acid modified Fe3O4 particles into compact clusters which were stabilized by surfactant in water. Both experimental and simulation works were conducted to study their heating performance at different cluster’s sizes. The dipole interactions improve the heating only when the clusters are small enough to bring an enhancement in clusters’ shape anisotropy. The shape anisotropy is reduced at greater clusters’ sizes, since the shapes of the clusters become more and more spherical. Consequently, the dipole interactions change to impair the heating efficiency at larger sizes. When the clusters are totally isotropic in shape, the heating efficiency is lower than that of non-interacting particles despite the cluster’s size, although the efficiency increases by a little bit at a particular size most likely due to the dipole couplings. In these situations, one has to use particles with higher magnetic anisotropy and/or saturation magnetization to improve the heating.
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影响因子：
4.6
作者：
Branquinho, Luis C.;Carriao, Marcus S.;Costa, Anderson S.;Zufelato, Nicholas;Sousa, Marcelo H.;Miotto, Ronei;Ivkov, Robert;Bakuzis, Andris F.
通讯作者：
Bakuzis, Andris F.
影响因子：
38.3
作者：
Lee, Jae-Hyun;Jang, Jung-tak;Cheon, Jinwoo
通讯作者：
Cheon, Jinwoo
影响因子：
2.7
作者：
Dutz, Silvio;Clement, Joachim H.;Zeisberger, Matthias
通讯作者：
Zeisberger, Matthias
影响因子：
3.4
作者：
Benkoski, Jason J.;Deacon, Ryan M.;Pyun, Jeffrey
通讯作者：
Pyun, Jeffrey
影响因子：
3.7
作者：
Conde-Leboran, Ivan;Baldomir, Daniel;Serantes, David
通讯作者：
Serantes, David