Quantitative explanation of the difference in AC magnetization curves between suspended and immobilized magnetic nanoparticles for biomedical application
Quantitative explanation of the difference in AC magnetization curves between suspended and immobilized magnetic nanoparticles for biomedical application
复制标题
生物医学应用中悬浮和固定磁性纳米颗粒之间交流磁化曲线差异的定量解释
DOI：
10.1016/j.jmmm.2022.170089
复制
发表时间：
2022
影响因子：
2.7
通讯作者：
Takashi Yoshida
中科院分区：
文献类型：
--
作者：
Keiji Enpuku;Shuya Yamamura;Takashi Yoshida
我们研究了悬浮和固定的磁性纳米颗粒（MNP）之间的交流磁化（M-H）曲线的差异。我们使用三个商业MNP样品，通常用于生物医学应用。首先，我们测量当激励场的振幅Hac改变时ACM− H曲线的滞后面积A。TheAvsHaccurve比较与以前获得的分析结果，考虑到在样品中的MNP尺寸分布。我们表明，他们定量同意悬浮和固定的样品。通过比较，我们阐明了悬浮样品的ACM− H曲线的决定机制。对于highHac，Néel弛豫在悬浮样品中变得占主导地位，并且与固定的情况相比，由AC场引起的易磁化轴的对准增加了滞后损失。悬浮样品中的布朗弛豫效应随Hac的减小而增大，并在低场下产生额外的损耗。定量评估样品中Néel松弛和布朗松弛占主导地位的MNP的部分。我们还澄清了悬浮和固定样品之间的谐波信号的差异。最后，我们讨论了决定悬浮样品中主要弛豫机制的MNP参数和激发场的条件。
We study the difference in AC magnetization (M−H) curves between suspended and immobilized magnetic nanoparticles (MNPs). We use three commercial MNP samples that are often used for biomedical application. First, we measure the hysteresis area of the ACM−Hcurve,A, when the amplitude of the excitation field,Hac, is changed. TheAvsHaccurve is compared with previously obtained analytical results by taking account of the MNP size distribution in the sample. We show that they quantitatively agree for both suspended and immobilized samples. From the comparison, we clarify the mechanism that determines the ACM−Hcurve of a suspended sample. For highHac, the Néel relaxation becomes dominant in the suspended sample, and alignment of easy axes caused by the AC field increases the hysteresis loss compared to the immobilized case. The effect of Brownian relaxation in the suspended sample increases with decreasingHacand gives additional loss at low field. The portion of Néel-relaxation- and Brownian-relaxation-dominant MNPs in the sample is quantitatively evaluated. We also clarify the difference in harmonic signals between suspended and immobilized samples. Finally, we discuss the condition for the MNP parameters and excitation field that determines the dominant relaxation mechanism in a suspended sample.
登录
查看更多内容
固定磁性纳米粒子的磁滞损耗对易轴角的依赖性：易轴对准的影响
影响因子：
1.6
作者：
Keiji Enpuku;Takashi Yoshida
通讯作者：
Takashi Yoshida
振荡磁场下液体中磁性纳米颗粒物理旋转的磁和粘性模式
影响因子：
4
作者：
M. Suwa;A. Uotani;S. Tsukahara
通讯作者：
S. Tsukahara
DOI：
10.1016/j.bbagen.2016.12.006
发表时间：
2017-06-01
影响因子：
3
作者：
Coisson, Marco;Barrera, Gabriele;Tiberto, Paola
通讯作者：
Tiberto, Paola
DOI：
10.3390/s18041043
发表时间：
2018-03-30
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Chieh JJ;Wei WC;Liao SH;Chen HH;Lee YF;Lin FC;Chiang MH;Chiu MJ;Horng HE;Yang SY
通讯作者：
Yang SY
从交流磁化曲线矫顽场评价磁性纳米颗粒的有效磁各向异性常数
影响因子：
3.2
作者：
Enpuku Keiji;Draack Sebastian;Ludwig Frank;Yoshida Takashi
通讯作者：
Yoshida Takashi