Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions
Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions
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DOI：
10.1063/1.4919268
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发表时间：
2015-04
影响因子：
3.2
通讯作者：
T. Sasayama;Takashi Yoshida;M. M. Saari-M.;K. Enpuku
中科院分区：
文献类型：
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作者：
T. Sasayama;Takashi Yoshida;M. M. Saari-M.;K. Enpuku
研究了磁性纳米粒子的磁矩和磁体积的分布。这些分布估计通过应用奇异值分解方法在液相中测量的M-H曲线。将估计的分布与对数正态分布的混合分布进行了比较，两个结果吻合得很好。利用估算的磁矩分布，我们还分析了固定化MNP的M-H曲线，以估算确定固定化MNP的Neel弛豫的各向异性能常数Ku和特征时间τON的平均值。对于Resovist MNP，Ku和τON值分别估计为4 kJ/m3和1×10−9 s。
We studied the distributions of the magnetic moment and magnetic volume of magnetic nanoparticles (MNPs). These distributions were estimated by applying the singular value decomposition method to the M-H curve measured in the liquid phase. The estimated distributions were compared with a mixture of log-normal distributions, and two results agree well with each other. Using the estimated distribution of the magnetic moment, we also analyzed the M-H curve of immobilized MNPs in order to estimate the average value of the anisotropy energy constant Ku and the characteristic time τON that determines the Neel relaxation of immobilized MNPs. The values Ku and τON are estimated as 4 kJ/m3 and 1×10−9 s, respectively, for Resovist MNPs.