Department of Physics, NTNU, Høgskoleringen 5, NO-7491, Trondheim, Norway.
J Phys Condens Matter. 2010 Aug 18;22(32):324104. doi: 10.1088/0953-8984/22/32/324104. Epub 2010 Jul 15.
The electric field induced structuring in clay-oil suspensions has been studied by means of wide angle x-ray scattering (WAXS), rheometry, scanning electron microscopy (SEM), as well as leak current density and dielectric constant measurements. The clay particles' orientation distribution was inferred from the azimuthal changes of the clay diffraction peak intensity. The angular width of that distribution was quantified through an orientational order parameter. Chain and column formation processes were distinguished by comparison of the time evolution of the diffraction peak amplitude with that of the current density. Leak current density was measured for different electric field strengths E and clay particle concentrations Φ. The following scaling relation was found: [Formula: see text]. In addition, the dependence of the yield stress on the electric field and on the particle concentration was measured and shown to scale as: [Formula: see text].
通过广角 X 射线散射（WAXS）、流变学、扫描电子显微镜（SEM）以及漏电流密度和介电常数测量研究了电场诱导的粘土-油悬浮液的结构化。粘土颗粒的取向分布是通过粘土衍射峰强度的方位变化推断出来的。通过取向有序参数来量化该分布的角宽度。通过比较衍射峰振幅和电流密度的时间演化，区分了链和柱形成过程。测量了不同电场强度 E 和粘土颗粒浓度 Φ 的漏电流密度。发现了以下标度关系：[公式：见文本]。此外，还测量了屈服应力对电场和颗粒浓度的依赖性，并表明其标度关系为：[公式：见文本]。
