MEASUREMENTS OF PARTICLE-SIZE DISTRIBUTION PARAMETERS IN FERROFLUIDS
MEASUREMENTS OF PARTICLE-SIZE DISTRIBUTION PARAMETERS IN FERROFLUIDS
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DOI：
10.1109/tmag.1978.1059918
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发表时间：
1978-01-01
影响因子：
2.1
通讯作者：
CHARLES, SW
中科院分区：
文献类型：
--
作者：
CHANTRELL, RW;POPPLEWELL, J;CHARLES, SW
本文提出了一种从室温磁化曲线确定标准偏差（σ）和中位粒径（Dv）的方法（对于粒径呈对数正态分布的铁磁流体）。该方法已应用于几种含有铁氧体颗粒的商业铁磁流体，以及由赫斯和帕克的方法制备的含钴颗粒的甲苯流体。并用电子显微镜测量了颗粒的大小分布。研究发现，磁性数据给出的“磁性尺寸分布”参数dvp和σm与电镜数据得到的“物理尺寸分布”参数dvp和σ不同。发现Dvp> Dvm，和。这些观察结果与Kaiser、Miskolczy、Granqvist和Buhrman的结果一致。
A method is presented by means of which (for a ferrofluid with a lognormal distribution of particle size) it is possible to determine the standard deviation (σ) and median particle diameter (Dv) from the room temperature magnetisation curve. The method has been applied to several commercial ferrofluids, containing ferrite particles, and to fluids consisting of cobalt particles in toluene prepared by the method of Hess and Parker. The particle size distributions have also been measured by using an electron microscope. It has been found that the magnetic data gives estimates of the 'magnetic size distribution' parameters Dvmand σm, which differed from the 'physical size distribution' parameters Dvpand σpobtained from electron microscope data. It is found that Dvp> Dvm, and. These observations are consistent with the results of Kaiser and Miskolczy and Granqvist and Buhrman.