ORIGIN OF MAGNETIC BIREFRINGENCE AND DICHROISM IN MAGNETIC FLUIDS
ORIGIN OF MAGNETIC BIREFRINGENCE AND DICHROISM IN MAGNETIC FLUIDS
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DOI：
10.1109/tmag.1980.1060595
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发表时间：
1980-01-01
影响因子：
2.1
通讯作者：
SCHOLTEN, PC
中科院分区：
文献类型：
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作者：
SCHOLTEN, PC
在磁性流体中观察到的光学双折射和二向色性，当受到磁场时，通常归因于粒子的取向，各向异性的空间有序，或字符串的形成。这些机制预测的各向异性的幅度，浓度和时间依赖性进行了比较与现有的实验数据。这导致的结论是，小聚集体的取向和二次聚集成字符串的大聚集体是最有可能的原因大的各向异性。单个粒子的取向只能引起小的各向异性。场诱导的空间有序，至少在光学上，还没有被观察到。
The optical birefringence and dichroism observed in magnetic fluids when subjected to a magnetic field are generally ascribed to orientation of the particles, to anisotropic spatial ordering, or to string formation. Magnitude, concentration- and time dependence of the anisotropies predicted by these mechanisms are compared with the available experimental data. This leads to the conclusion that orientation of small aggregates and secondary aggregation of large aggregates into strings are the most likely cause of the large anisotropies. Orientation of single particles can be responsible for small anisotropies only. Field-induced spatial ordering has, at least optically, not (yet) been observed.