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首页> 外文期刊>IEEE Transactions on Magnetics >Mn–Zn Ferrite Nanoparticles With Silica and Titania Coatings: Synthesis, Transverse Relaxivity, and Cytotoxicity
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Mn–Zn Ferrite Nanoparticles With Silica and Titania Coatings: Synthesis, Transverse Relaxivity, and Cytotoxicity

机译：二氧化硅和二氧化钛涂层的锰锌铁氧体纳米颗粒：合成，横向弛豫和细胞毒性

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摘要

Mn-Zn ferrite nanoparticles of composition Mn0,61Zn0,42Fe1,97O4 and mean size of crystallites dXRD = 11 nm are synthesized under hydrothermal conditions as a single-phase product. Subsequently, two coated samples are prepared by encapsulation of the ferrite particles into silica and titania. Transmission electron microscopy confirms the core-shell structure of the products and shows that the cores are actually formed by small clusters of ferrite crystallites. Powder X-ray diffraction, combined with experimental hydrothermal treatment of the titania-coated product, demonstrates that the titania coating is amorphous but can easily be transformed into anatase. The colloidal stability of nanoparticles in water is evidenced by dynamic light scattering, and the respective hydrodynamic sizes are dZ = 87 and 157 nm for the silica-coated and titania-coated particles. The colloidal behavior is confirmed based on the measurements of zeta potential, whose negative values lead to strong Coulombic repulsion among coated particles. Magnetic measurements on bare and coated particles show high magnetization of Mn0,61Zn0,42Fe1,97O4 cores and superparamagnetic state at room temperature. The relaxometric study on aqueous suspensions in magnetic fields of 0.5 and 11.75 T reveals high transverse relaxivity of the samples and two distinct forms of its temperature dependence, which are analyzed with respect to the role of temperature-dependent parameters, that is, the diffusion of water and the magnetization of ferrite cores. Finally, careful evaluation of cytotoxicity of coated particles is carried out by using two different methods, namely, the determination of viability and proliferation of Jurkat cells and the real-time monitoring of attachment and proliferation of A549 cells. In the studied range of concentrations, the viability and proliferation of suspension cells are not affected, and only negligible effects are detected in the cell index of adherent cells.
机译：组成为Mn 0,61 Zn 0,42 Fe 1,97 O 4 和在水热条件下合成的微晶平均尺寸d XRD = 11 nm为单相产物。随后，通过将铁氧体颗粒封装到二氧化硅和二氧化钛中来制备两个涂层样品。透射电子显微镜证实了产物的核-壳结构，并表明核实际上是由小的铁素体微晶簇形成的。粉末X射线衍射结合对二氧化钛涂层产品进行的实验水热处理表明，二氧化钛涂层是无定形的，但很容易转化为锐钛矿。动态光散射证明了纳米粒子在水中的胶体稳定性，对于二氧化硅涂层和二氧化钛涂层的颗粒，其各自的流体动力学尺寸分别为d Z = 87和157 nm。胶体行为是根据zeta电位的测量结果确定的，该电位的负值会导致涂层颗粒之间产生强烈的库仑排斥。裸露和涂层颗粒的磁性测量表明Mn 0,61 Zn 0,42 Fe 1,97 O 4 < / sub>磁芯和室温下的超顺磁性状态。在0.5和11.75 T磁场中对水悬浮液的弛豫研究表明，样品具有较高的横向弛豫性和两种不同形式的温度依赖性，并根据温度依赖性参数的作用进行了分析，即水和铁氧体磁芯的磁化。最后，使用两种不同的方法对包被颗粒的细胞毒性进行仔细评估，即测定Jurkat细胞的活力和增殖以及实时监测A549细胞的附着和增殖。在所研究的浓度范围内，悬浮细胞的活力和增殖不受影响，并且在粘附细胞的细胞指数中仅检测到微不足道的影响。

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