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Properties of nanoparticles prepared from NdFeB-based compound for magnetic hyperthermia application

机译：由NdFeB基化合物制备的纳米粒子的磁热疗性能

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摘要

Nanoparticles were prepared from a NdFeB-based alloy using the hydrogen decrepitation process together with high-energy ball milling and tested as heating agent for magnetic hyperthermia. In the milling time range evaluated (up to 10h), the magnetic moment per mass at H=1.59MAm ~1 is superior than 70Am ~2kg ~1; however, the intrinsic coercivity might be inferior than 20kAm ~1. The material presents both ferromagnetic and superparamagnetic particles constituted by a mixture of phases due to the incomplete disproportionation reaction of Nd _2Fe _(14)BH _x during milling. Solutions prepared with deionized water and magnetic particles exposed to an AC magnetic field (H _(max)3.7kAm ~1 and f=228kHz) exhibited 26KΔT _(max)44K with a maximum estimated specific absorption rate (SAR) of 225Wkg ~1. For the pure magnetic material milled for the longest period of time (10h), the SAR was estimated as 2500Wkg ~1. In vitro tests indicated that the powders have acceptable cytotoxicity over a wide range of concentration (0.1100gml ~1) due to the coating applied during milling.
机译：纳米粒子由NdFeB基合金使用氢爆破工艺和高能球磨制备而成，并作为磁热疗的加热剂进行了测试。在所评估的铣削时间范围内（长达10h），H = 1.59MAm〜1时每质量的磁矩优于70Am〜2kg〜1;但是，固有矫顽力可能低于20kAm〜1。由于在研磨过程中Nd _2Fe _（14）BH _x的不完全歧化反应，该材料同时呈现出由相的混合物构成的铁磁和超顺磁颗粒。用去离子水和磁性颗粒暴露于AC磁场（H _（max）3.7kAm〜1和f = 228kHz）制备的溶液显示26KΔT_（max）44K，最大估计比吸收率（SAR）为225Wkg〜1 。对于最长研磨时间（10h）的纯磁性材料，SAR估计为2500Wkg〜1。体外试验表明，由于在研磨过程中使用了涂层，这些粉末在很宽的浓度范围内（0.1100gml〜1）具有可接受的细胞毒性。

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