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Dynamic Magnetization Properties of Platelet Ferromagnetic Nanoparticles and Their Heat Generation Injected in Tumors of Mice

机译:血小板铁磁纳米粒子的动态磁化特性及其在小鼠肿瘤中的发热

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Development of high-heat-generating materials is essential for magnetic nanoparticle hyperthermia therapy. As a candidate, oval platelet Fe oxide nanoparticles of sizes 30-100 nm were synthesized, and their surfaces were decorated with tetraethylene glycol block polymer. The water-based suspension showed good dispersion properties, suggesting high applicability for medical usage. High-frequency hysteresis measurement, which is helpful for understanding the mechanism of specific loss power, was carried out at the same frequency and magnetic field amplitude (H0) range as heating. Frequency-independent ferromagnetic hysteresis was observed, and this supported the ferromagnetic heating mechanism. The suspension was directly injected into the cancerous tumor of mice and subjected to 114 kHz alternating current magnetic field below 51 kA/m, which was sufficient for elevating the local temperature to approximately 50 °C. The tumor size decreased upon heating at an early stage and was restored to nearly the original size after 14 days. Distinguished differences were observed between the platelet Fe3-δO4 and superparamagnetic particles with respect to temperature rise and the resulting damaging effects to the tumor.
机译:高发热材料的开发对于磁性纳米粒子热疗至关重要。作为候选物,合成了尺寸为30-100 nm的椭圆形片状Fe氧化物纳米颗粒,并用四甘醇嵌段聚合物修饰其表面。所述水基悬浮液显示出良好的分散性能,表明其在医疗用途中的高度适用性。在与加热相同的频率和磁场振幅(H 0 )范围内进行高频磁滞测量,有助于理解比损耗功率的机理。观察到与频率无关的铁磁滞后,这支持了铁磁加热机制。将悬浮液直接注射到小鼠的癌性肿瘤中,并在低于51 kA / m的114 kHz交流磁场下进行,足以将局部温度升高至大约50°C。肿瘤尺寸在早期加热时减小,并在14天后恢复到接近原始尺寸。观察到血小板Fe 3-δ O 4 与超顺磁性颗粒之间在温度升高方面存在显着差异,并且对肿瘤产生破坏作用。

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