Electric field induced structuring in clay-oil suspensions: new insights from WAXS, SEM, leak current, dielectric permittivity, and rheometry

被引：23

作者：

Rozynek, Z. ^{[1
]}

Knudsen, K. D. ^{[2
]}

Fossum, J. O. ^{[1
]}

Meheust, Y. ^{[3
]}

Wang, B. ^{[1
]}

Zhou, M. ^{[1
]}

机构：

[1] NTNU, Dept Phys, NO-7491 Trondheim, Norway

[2] IFE, Dept Phys, Kjeller, Norway

[3] Univ Rennes 1, CNRS, UMR 6118, Rennes, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 32期

关键词：

ELECTRORHEOLOGICAL SUSPENSIONS; FLUIDS;

D O I：

10.1088/0953-8984/22/32/324104

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 Phi. The following scaling relation was found: J proportional to Phi(0.74)E(2.12). In addition, the dependence of the yield stress on the electric field and on the particle concentration was measured and shown to scale as: tau(y) proportional to Phi(0.87)E(1.66).

引用

页数：8