Correlation between Generated Shear Stress and Generated Permittivity for the Electrorheological Response of Colloidal Silica Suspensions

Saimoto, Yoshihisa; Satoh, Tomoaki; Konno, Mikio

doi:10.1006/jcis.1999.6454

Cited by 8 publications

(8 citation statements)

References 39 publications

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“…17,[25][26][27][28] All studies report that the effective transport properties are enhanced at small shear rates and large field strengths, much like that observed for quiescent suspensions in applied fields. As the shear rate is increased, the effective transport properties decrease, approaching the values obtained for suspensions in the absence of a field.…”

Section: ͑3͒mentioning

confidence: 71%

“…These results agree qualitatively with the experimental results reported for the shear rate and field strength dependence of the dielectric permittivity and electrical conductivity of ER suspensions. 17,[25][26][27][28] At small Mn, hydrodynamic forces are relatively weak, and thus columnar structures that are broken by the straining motion can rapidly reform. On average, the structure is highly anisotropic which results in a large effective thermal conductivity.…”

Section: A Scmf Analysis With Simulated Structuresmentioning

confidence: 99%

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Thermal transport in sheared electro- and magnetorheological fluids

2006

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Thermal energy transport in sheared electrorheological and magnetorheological ͑ER and MR͒ fluids is analyzed. Although energy production by viscous dissipation can be significant, energy transport on the particle length scale can be analyzed by ignoring viscous dissipation. For typical situations, energy transport normal to the flow direction is dominated by conduction. Particle-level simulations were employed to determine the suspension structure as a function of Mason number and volume fraction. A self-consistent mean-field dipole model is used to estimate the effective thermal conductivities for these simulated structures. The field-induced chain-like aggregates that form at small Mason number result in a larger effective thermal conductivity at small Mason number than at large Mason number. Effects of higher-order multipoles are estimated by analyzing effective thermal conductivities of model structures. For highly conducting particles, the effective thermal conductivity of a sheared ER or MR suspension is predicted to roughly double as the Mason number is decreased from the large to the small Mason number limits.

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Section: ͑3͒mentioning

confidence: 71%

Section: A Scmf Analysis With Simulated Structuresmentioning

confidence: 99%

Thermal transport in sheared electro- and magnetorheological fluids

2006

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“…Highly monodisperse silica particles were prepared from the hydrolysis and condensation reaction and had an average diameter of 630 nm, which was the same as in previous work (1). Water content in the particles was adjusted to 4.5 wt% by means of a vacuum drying treatment and measured by thermogravimetric analysis (21)(22)(23).…”

Section: Methodsmentioning

confidence: 99%

“…For particles with high water contents, steady state was not attained, but remarkably, the electrorheological response after the application of an electric field showed that relation between the transient values of τ and the transient values of r fell along the correlation line presented by Eq. [1]. On the other hand, the transient value of the electric conductivity indicated that the aggregative structures developed with a lapse of time at the high water contents.…”

Section: Introductionmentioning

confidence: 94%

“…Since silica particles contain hydroxide groups which are ionizable in the presence of water adsorbed to the particle surface, the formation of aggregative structures of particles between electrodes can be detected as an increase in the electric conductivity due to the connection of water phases on particles. On the other hand, the dielectric permittivity can 1 To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Electrorheological Response and Structure Growth of Colloidal Silica Suspensions

Satoh

Ashitaka

Orihara

et al. 2001

Journal of Colloid and Interface Science

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Electrorheological properties and microstructure of silica suspensions

Gehin

Persello

Charraut

et al. 2004

Journal of Colloid and Interface Science

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We present experimental and theoretical results on the electrorheological response and microstructure of colloidal suspensions composed of silica nanoparticles dispersed in a silicon oil, as a function of electric field strength and silica water content. Using small-angle neutrons scattering experiments, we determined the evolution of the static structure factor of the suspensions when an electric field is applied. Experimental data were fitted with model calculations using the Percus-Yevick solution for Baxter's hard-sphere adhesive potential. The obtained stickiness parameter is directly related to the polarization interactions that depend on the water content of silica particles. The influence of the polarization interparticle potential on the rheology of the silica dispersions was investigated in a second time. A microscopic theory for the shear viscosity of adhesive hard-sphere suspensions was successfully used which describes the steady shear viscosity of suspension in terms of the fractal concept.

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Correlation between Generated Shear Stress and Generated Permittivity for the Electrorheological Response of Colloidal Silica Suspensions

Cited by 8 publications

References 39 publications

Thermal transport in sheared electro- and magnetorheological fluids

Thermal transport in sheared electro- and magnetorheological fluids

Electrorheological Response and Structure Growth of Colloidal Silica Suspensions

Electrorheological properties and microstructure of silica suspensions

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