AC Magnetic Technique to Measure Specific Absorption Rate of Magnetic Nanoparticles
AC Magnetic Technique to Measure Specific Absorption Rate of Magnetic Nanoparticles
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DOI：
10.1007/s10948-012-1941-2
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发表时间：
2013-04-01
影响因子：
1.8
通讯作者：
Usov, N. A.
中科院分区：
文献类型：
--
作者：
Gudoshnikov, S. A.;Liubimov, B. Y.;Usov, N. A.
应用电动力学方法来确定作为频率和磁场振幅的函数的超顺磁性纳米粒子的组装的比吸收率（SAR）。自制的频率可调电磁铁用于在体积为1 × 3 × 3 cm（3）的磁芯间隙中产生频率范围为f=10-150 kHz且磁场幅度高达H（0）=250 Oe的几乎均匀的磁场。两个反向连接的拾取线圈用于记录由磁性纳米颗粒产生的电动势信号（EMF）。通过对EMF信号进行积分，可以确定组件的低频磁滞回线和组件SAR。使用这种方法的SAR的测量已经进行了平均直径D=25 nm的磁铁矿纳米粒子。电动方法被证明是能够测量少量的磁性纳米粒子，高达5 × 10（-5）g，分散在固体基质。已获得的最大SAR类似于aEuro千分之80 W/g的磁铁矿纳米粒子组件调查。
The electrodynamic method is applied to determine the specific absorption rate (SAR) of an assembly of superparamagnetic nanoparticles as a function of frequency and magnetic field amplitude. The home made frequency-adjustable electromagnet is used to create a nearly uniform magnetic field in a core gap of a volume 1x3x3 cm(3) in the frequency range f=10-150 kHz and for magnetic field amplitudes up to H (0)=250 Oe. Two oppositely connected pick-up coils are used to record the electromotive force signal (EMF) generated by magnetic nanoparticles. By integrating the EMF signal one can determine the low-frequency hysteresis loops of the assembly and the assembly SAR. Using this method the measurement of SAR has been carried out for magnetite nanoparticles with an average diameter D=25 nm. The electrodynamic method is shown to be capable of measuring a small amount of magnetic nanoparticles, up to 5x10(-5) g, dispersed in a solid matrix. The maximal SAR similar to aEuro parts per thousand 80 W/g has been obtained for the magnetite nanoparticle assembly investigated.