Electrorheology of a model colloidal fluid

Journal Article · Sat Oct 15 00:00:00 EDT 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1379· OSTI ID:6995368

Martin, J E; Adolf, D ^[1]; Halsey, T C ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Univ. of Chicago, IL (United States). Dept. of Physics

The authors report experimental and theoretical results on the steady and oscillatory shear viscoelasticity of a model electrorheological fluid. Details of the fluid synthesis, via the nucleation and growth of monodisperse silica spheres, and light scattering studies of the spheres are also presented. The shear-thinning viscosity [mu] shows a power-law dependence [mu] [approximately] [dot [gamma]][sup [minus][Delta]] on the inverse strain rate [dot [gamma]], with [Delta] in the range 0.68--0.93. Likewise, the frequency-dependent viscosity [mu]([omega]) shows a power-law dependence [mu]([omega]) [approximately] [omega][sup [minus][bar [Delta]]] with [bar [Delta]] in the range 0.73--1.0. A theoretical treatment of steady-state cluster formation in applied electric and shear fields predicts the observed power-law dependences of the steady and oscillatory shear viscosities, albeit with exponents [Delta] = [bar [Delta]] = 2/3.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6995368
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 167:2; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
CHALCOGENIDES
CHEMICAL PREPARATION
COLLOIDS
DATA
DISPERSIONS
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
MATHEMATICAL MODELS
MINERALS
NONAQUEOUS SOLVENTS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RHEOLOGY
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLVENTS
SYNTHESIS