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Magnetic heating by cobalt ferrite nanoparticles

机译：钴铁氧体纳米粒子的电磁加热

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摘要

In the quest for suitable materials for hyperthermia we explored the preparation and properties of nanoparticles of Co ferrite. The material was produced by coprecipitation from water solution of Co and Fe chlorides and afterwards annealed at 400, 600 and 800 degrees C. The resulting particles were characterized by XRD, TEM, Mossbauer spectroscopy, and dc and ac magnetometry. The heating experiments in ac magnetic fields of various amplitudes were performed with diluted systems of particles suspended in agarose gel and the results were interpreted on the basis of the ac magnetic losses measured at various temperatures. The increase of magnetic losses and consequently of the heating efficiency with increasing temperature is explained by the strong dependence of the constant of magnetocrystalline anisotropy of Co ferrite on temperature.
机译：为了寻找适合热疗的材料，我们探索了铁氧体纳米粒子的制备和性能。该材料是通过从Co和Fe氯化物的水溶液中共沉淀制备的，然后在400、600和800摄氏度下进行退火。通过XRD，TEM，Mossbauer光谱以及dc和ac磁力分析对所得颗粒进行表征。使用悬浮在琼脂糖凝胶中的稀释粒子系统在各种振幅的交流磁场中进行加热实验，并根据在各种温度下测得的交流磁损耗来解释结果。磁损耗的增加以及随之而来的加热效率随温度升高的增加是由铁氧体钴磁晶各向异性常数对温度的强烈依赖性所解释的。

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