Particle dynamics in magnetorheological suspensions using diffusing wave spectroscopy

被引：45

作者：

Furst, EM ^{[1
]}

Gast, AP ^{[1
]}

机构：

[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW E | 1998年 / 58卷 / 03期

关键词：

D O I：

10.1103/PhysRevE.58.3372

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Magnetorheological suspensions acquire dipole moments in an external magnetic field. Suspensions of these dipolar particles rapidly aggregate to form long chains. We use diffusing-wave spectroscopy (DWS) and density-matched superparamagnetic emulsion droplets to probe the short-wavelength motion of the chains. The measured particle displacements are independent of the magnitude of the dipolar interactions at short times, but characterized by a constrained, subdiffusive motion at long times that slows as the dipolar interactions are increased. Our observations show good qualitative agreement with Brownian dynamics simulations of dipolar chains.

引用

页码：3372 / 3376

页数：5

共 30 条

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