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首页> 外文期刊>Journal of magnetism and magnetic materials >A wide-frequency range AC magnetometer to measure the specific absorption rate in nanoparticles for magnetic hyperthermia
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A wide-frequency range AC magnetometer to measure the specific absorption rate in nanoparticles for magnetic hyperthermia

机译：宽频范围的交流磁力计，用于测量纳米粒子在磁热疗中的比吸收率

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摘要

Measurement of specific absorption rate (SAR) of magnetic nanoparticles is crucial to assert their potential for magnetic hyperthermia. To perform this task, calorimetric methods are widely used. However, those methods are not very accurate and are difficult to standardize. In this paper, we present AC magnetometry results performed with a lab-made magnetometer that is able to obtain dynamic hysteresis-loops in the AC magnetic field frequency range from 50 kHz to 1 MHz and intensities up to 24 kA m~(-1). In this work, SAR values of maghemite nanoparticles dispersed in water are measured by AC magnetometry. The so-obtained values are compared with the SAR measured by calorimetric methods. Both measurements, by calorimetry and magnetometry, are in good agreement. Therefore, the presented AC magnetometer is a suitable way to obtain SAR values of magnetic nanoparticles.
机译：磁性纳米粒子的比吸收率（SAR）的测量对于确定其磁性热疗的潜力至关重要。为了执行该任务，量热法被广泛使用。但是，这些方法不是很准确，并且很难标准化。在本文中，我们介绍了使用实验室制造的磁力计执行的交流磁力计结果，该磁力计能够在50 kHz至1 MHz的交流磁场频率范围内以及高达24 kA m〜（-1）的强度下获得动态磁滞回线。 。在这项工作中，分散在水中的磁赤铁矿纳米颗粒的SAR值是通过AC磁强计测量的。将如此获得的值与通过量热法测量的SAR进行比较。通过量热法和磁力法的两种测量都很好地吻合。因此，提出的交流磁力计是获得磁性纳米粒子SAR值的合适方法。

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