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Deciphering magnetic hyperthermia properties of compositionally and morphologically modulated FeNi nanoparticles using first-order reversal curve analysis

机译：使用一阶反转曲线分析来解析组成和形态学调节的Feni纳米粒子的磁体热热性性质

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摘要

Magnetic hyperthermia based on nanoparticles (NPs) is considered a significant approach in cancer therapy. However, less attention has been paid to the correlation between hyperthermia properties and detailed magnetic characteristics. Herein, the hyperthermia capability of FexNi100-x (8 = x = 40) NPs synthesized using a polyol method was studied by investigating the temperature rise and specific loss power (SLP) of their ferrofluid (FF) solutions while also performing first-order reversal curve (FORC) analysis. The colloidal stability of magnetic NPs in the FFs was enhanced by coating their surface with polyethylene glycol, and the hyperthermia experiments were carried out in ethylene glycol and DI water (DIW) dispersion media using different concentrations (1.25, 2.5 and 5 mg ml(-1)). A field-emission scanning electron microscope was employed to characterize the morphology of the FeNi NPs, evidencing mean diameters ranging between 64-112 nm. Hysteresis loop measurements showed a decreasing trend of average coercive field from 94 to 52 Oe when decreasing the diameter, coinciding with a 13% increase in the reversible fraction of single-domain and superparamagnetic (SP) NPs, according to FORC results. In this way, the corresponding SLP value increased from 55 to 264 W g(-1) for FFs in 1.25 mg ml(-1) concentrated DIW medium with an SP fraction of 40%.
机译：基于纳米颗粒（NPS）的磁体热疗被认为是癌症治疗中的重要方法。然而，对热疗性质和细节磁特性之间的相关性进行了不太关注。在此，通过研究其Ferrofluid（FF）解决方案的温度升高和特定损耗功率（SLP），研究了使用多元醇方法合成的FEXNI100-X（8 = x＆ = 40）NP的热疗能力一阶逆转曲线（Forc）分析。通过用聚乙二醇涂覆它们的表面来增强FF中磁NP的胶体稳定性，并使用不同浓度（1.25,2.5和5mg（ - - 4）（ - 4.25,2.5mg）在乙二醇和二水（DIW）分散培养基中进行热疗实验。 1））。使用现场排放扫描电子显微镜来表征FENI NP的形态，证明平均直径范围在64-112nm之间。根据Forc结果，在降低直径时，滞后回路测量结果显示在94至52 OE中的平均矫顽面从94至52°的趋势降低，同时达到单结构域和超顺磁性（SP）NPS的可逆分数增加13％。以这种方式，相应的SLP值从1.25mg ml（-1）浓缩的DIW培养基中的FF增加到25至264Wg（-1），SP分数为40％。

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