Magnetic and Optical Properties of Isolated and Aggregated CoFe2O4 Superparamagnetic Nanoparticles Studied by MCD Spectroscopy,The Journal of Physical Chemistry C

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Magnetic and Optical Properties of Isolated and Aggregated CoFe2O4 Superparamagnetic Nanoparticles Studied by MCD Spectroscopy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-02 00:00:00 , DOI: 10.1021/acs.jpcc.8b00829
Yulia A. Gromova ₁ , Vladimir G. Maslov ₁ , Mikhail A. Baranov ₁ , Raquel Serrano-García ₂ , Vera A. Kuznetsova _{1,

2} , Finn Purcell-Milton ₂ , Yurii K. Gun’ko ₂ , Alexander V. Baranov ₁ , Anatoly V. Fedorov ₁

Affiliation

Magnetic, optical, and structural properties of superparamagnetic CoFe₂O₄ nanoparticles (MNPs), both isolated and in aggregates, are investigated by magnetic circular dichroism (MCD) spectroscopy. The MCD signal for MNPs is more than an order of magnitude greater than the signal for organic molecules, therefore making this technique a very sensitive tool for the examination of MNP properties. MNP aggregation had a distinct effect upon the MCD signal intensity. Correlation between MCD signal intensity and MNP magnetization shows that MNP aggregation in colloidal solutions results in the changing of MNP magnetization with a maximum at the mean aggregate size of approximately 100 nm.

中文翻译：

MCD光谱研究分离和聚集的CoFe ₂ O ₄超顺磁性纳米粒子的磁和光学性质

通过磁性圆二色性（MCD）光谱研究了超顺磁性CoFe ₂ O ₄纳米颗粒（MNP）的磁性，光学和结构性质，无论是分离的还是聚集的。MNP的MCD信号比有机分子的MCD信号大一个数量级，因此使该技术成为检查MNP特性的非常灵敏的工具。MNP聚集对MCD信号强度有明显的影响。MCD信号强度与MNP磁化强度之间的相关性表明，胶体溶液中的MNP聚集会导致MNP磁化强度发生变化，最大聚集体大小约为100 nm。

更新日期：2018-05-02

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