Power dissipation in magnetic nanoparticles evaluated using the AC susceptibility of their linear and nonlinear responses
Power dissipation in magnetic nanoparticles evaluated using the AC susceptibility of their linear and nonlinear responses
复制标题
使用线性和非线性响应的交流磁化率评估磁性纳米颗粒的功耗
DOI：
10.1016/j.jmmm.2020.167401
复制
发表时间：
2021
影响因子：
2.7
通讯作者：
YasushiTakemura
中科院分区：
文献类型：
--
作者：
Tsuyoshi Yamaminami;Satoshi Ota;Suko Bagus Trisnanto;Mamoru Ishikawa;Tsutomu Yamada;Takashi Yoshida;Keiji Enpuku;YasushiTakemura
由磁性纳米颗粒耗散的热量可以用作癌症的热疗的热源，并且当施加交流（AC）磁场时，可以基于磁化率来估计。在这里，磁性纳米颗粒的磁化强度的频率依赖性测量不同的AC场。这用于检查线性和非线性磁化响应的AC磁化率。两种方法被用来评估AC磁化率的基础上测得的磁化特性。第一个使用的静态磁化率和相位延迟与磁弛豫，和第二个使用的AC磁化曲线下的面积来推导出的磁化率的虚部。当场强较低时，估计的AC磁化率相当。然而，当场强较高时，第一种方法预测的值较低，因为它没有考虑磁化响应的非线性。为了优化热疗的材料和施加的场条件，重要的是要了解这两种方法之间的差异。还评估了磁性纳米颗粒的本征损耗功率和比损耗功率。具有定向易轴的液体样品和固体样品提供高散热。
The heat dissipated by magnetic nanoparticles may be used as a heat source for hyperthermic treatment of cancer and it can be estimated based on the magnetic susceptibility when an alternating current (AC) magnetic field is applied. Here, the frequency dependence of the magnetization of magnetic nanoparticles is measured for different AC fields. This is used to examine the AC susceptibility of linear and nonlinear magnetization responses. Two methods were used to evaluate the AC susceptibility based on measured magnetization properties. The first used the static susceptibility and phase delay associated with magnetic relaxation, and the second used the area under the AC magnetization curve to derive the imaginary part of the susceptibility. When the field intensity was low, the estimated AC susceptibilities were comparable. However, when the field intensity was high, the first method predicted a lower value because it did not consider the nonlinearity of the magnetization response. To optimize the material and the applied field conditions for hyperthermia it is important to understand the difference between the two methods. The intrinsic loss power and specific loss power of the magnetic nanoparticles were also evaluated. A liquid sample and a solid sample with an oriented easy axis provided high heat dissipation.