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Effects of shape and size of cobalt ferrite nanostructures on their MRI contrast and thermal activation

机译：钴铁氧体纳米结构的形状和大小对其MRI对比度和热活化的影响

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Cobalt ferrite magnetic nanostructures were synthesized via a high temperature solution phase method. Spherical nanostructures of various sizes were synthesized with the help of seed mediated growth of the nanostructures in organic phase, while faceted irregular (FI) cobalt ferrite nanostructures were synthesized via the same method but in the presence of a magnetic field. Magnetic properties were characterized by SQUID magnetometry, relaxivity measurements and thermal activation under RF field, as a function of size and shape. The results show that the saturation magnetization of the nanostructures increases with an increase in size, and the FI nanostructures exhibit lower saturation magnetization than their spherical counterparts. The relaxivity coefficient of cobalt ferrite nanostructures increases with increase in size; while FI nanostructures show a higher relaxivity coefficient than spherical nanostructures with respect to their saturation magnetization. In the case of RF thermal activation, the specific absorption rate (SAR) of nanostructures increases with increase in the size. The contribution sheds light on the role of size and shape on important magnetic properties of the nanostructures in relation to their biomedical applications.
机译：通过高温固溶相法合成了钴铁氧体磁性纳米结构。借助于种子介导的有机相中纳米结构的生长，合成了各种尺寸的球形纳米结构，而通过相同的方法但是在磁场的存在下合成了不规则面状（FI）的钴铁氧体纳米结构。磁性能通过SQUID磁力测定法，弛豫度测量和RF场下的热活化来表征，取决于尺寸和形状。结果表明，纳米结构的饱和磁化强度随着尺寸的增加而增加，而FI纳米结构的饱和磁化强度比球形结构低。钴铁氧体纳米结构的弛豫系数随尺寸的增加而增加。而FI纳米结构的饱和磁化强度显示出比球形纳米结构高的弛豫系数。在RF热活化的情况下，纳米结构的比吸收率（SAR）随着尺寸的增加而增加。该贡献揭示了尺寸和形状对纳米结构与其生物医学应用相关的重要磁性的作用。

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