Determination of core and hydrodynamic size distributions of CoFe2O4 nanoparticle suspensions using ac susceptibility measurements

Ludwig F.; Guillaume A.; Schilling M.; Frickel N.; Schmidt A. M.

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Determination of core and hydrodynamic size distributions of CoFe2O4 nanoparticle suspensions using ac susceptibility measurements

机译：使用磁化率测量法确定CoFe2O4纳米颗粒悬浮液的核心和流体力学尺寸分布

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The complex susceptibility was measured on CoFe2O4 nanoparticle suspensions in the frequency range between 1 kHz and 1 MHz for different values of a superimposed static magnetic field. The maximum in the imaginary part χ″ of the ac susceptibility shifts to higher frequencies with increasing static magnetic field. The shift is theoretically modeled utilizing the magnetic field dependence of the Brownian relaxation time constant and assuming a distribution of hydrodynamic particle sizes. The mean hydrodynamic size as determined from the maximum of χ″ in zero field and the mean core size as obtained from the shift of the χ″ peak with static field agree very well with the data from transmission electron microscopy and dynamic light scattering measurements, respectively. The results indicate that both core and hydrodynamic size distributions can be determined from measurements on nanoparticle suspensions proposed that magnetic dipole-dipole interactions are negligible.

机译：对于CoFe2O4纳米颗粒悬浮液，在1 kHz和1 MHz之间的频率范围内，对于叠加的静磁场的不同值，测量了复杂的磁化率。随着静磁场的增加，磁化率的虚部χ''中的最大值移至更高的频率。理论上利用布朗弛豫时间常数的磁场依赖性对位移进行建模，并假设流体动力学粒度的分布。由零场中的最大值计算得出的平均流体力学尺寸和由静电场中的变化得出的平均芯体尺寸分别与透射电子显微镜和动态光散射测量的数据非常吻合。结果表明，可以通过对纳米粒子悬浮液的测量来确定核心尺寸和流体动力学尺寸分布，因为悬浮液提出了磁偶极-偶极相互作用可忽略不计。

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《Journal of Applied Physics》 |2010年第3期|P.033918-033918-5|共5页
作者
Ludwig F.; Guillaume A.; Schilling M.; Frickel N.; Schmidt A. M.;
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Institut für Elektrische Messtechnik und Grundlagen der Elektrotechnik, TU Braunschweig, Hans-Sommer-Str. 66, D-38106 Braunschweig, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
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1. Determination of core and hydrodynamic size distributions of CoFe_2O_4 nanoparticle suspensions using ac susceptibility measurements [J] . F. Ludwig, A. Guillaume, M. Schilling, Journal of Applied Physics . 2010,第3期

机译：交流磁化率测定法确定CoFe_2O_4纳米颗粒悬浮液的核和流体动力学尺寸分布
2. Magnetic Core-Size Distribution of Magnetic Nanoparticles Estimated From Magnetization, AC Susceptibility, and Relaxation Measurements [J] . Ahmed L. Elrefai, Teruyoshi Sasayama, Takashi Yoshida, IEEE Transactions on Magnetics . 2017,第11期

机译：通过磁化，交流磁化率和弛豫测量估算的磁性纳米粒子的磁芯尺寸分布
3. The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements [J] . R.AWAD, N.H.MOHAMMED, A.I.ABOU ALY, 先进陶瓷（英文版） . 2016,第001期

机译：交流磁化率法测量纳米CoFe2O4的添加对GdBa2Cu3O7-δ磁性的影响
4. Magnetic core-size distribution of magnetic nanoparticles estimated from magnetization, AC susceptibility and relaxation measurements [C] . A.L. Elrefai, T. Sasayama, T. Yoshida, 2017 IEEE International Magnetics Conference . 2017

机译：通过磁化强度，交流磁化率和弛豫测量值估算的磁性纳米粒子的磁芯尺寸分布
5. Measurement of atmospheric aerosols: Size distributions of nanoparticles, estimation of size distribution moments and control of relative humidity. [D] . Woo, Keung Shan. 2003

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Determination of core and hydrodynamic size distributions of CoFe2O4 nanoparticle suspensions using ac susceptibility measurements

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