An intrinsic mechanism for the activity of alumino‐silicate based electrorheological materials

Filisko, Frank E.; Radzilowski, L. H.

doi:10.1122/1.550095

Cited by 143 publications

(68 citation statements)

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“…For this reason, anhydrous fluids that would be responsible for the ER effect because the ER effect is induced by the external electric field. The ER fluids are receiving more attention in the last few years, and a number of anhydrous ER fluids have been developed previous works show that interfacial polarization, one kind of slow polarization, would mainly contribute to ER activity (6,(9)(10)(11)(12). Nevertheless, most of them can not yet work under the desired temperature range.…”

Section: Introductionmentioning

confidence: 99%

The Conductivity Confined Temperature Dependence of Water-Free Electrorheological Fluids

Hao

1996

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

The Conductivity Confined Temperature Dependence of Water-Free Electrorheological Fluids

Hao

1996

Journal of Colloid and Interface Science

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“…The stress measured at 1.0 kV/mm and that measured at 0.5 kV/mm were reduced by the factor 2ε c ε 0 (βE) 2 , which is proportional to the electric force (with the dimension of stress) acting between the particles. As described in section 3.1, β is assumed to be unity in the present study.…”

Section: Apparent Conductivity and Reduced Stress Plottedmentioning

confidence: 99%

Simultaneous Measurement of Rheological Behavior and Conduction Current for an Electro-Rheological Suspension with Cation Exchange Resin Particles.

Tanaka

Ichizawa

Akiyama

et al. 2001

J. Soc. Rheol., Jpn

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Simultaneous measurement of rheological behavior and conduction current was performed for an electrorheological (ER) suspension with a dilute concentration of cation exchange resin particles of 5 wt%. The stress under the electric field for the ER suspension showed a remarkable dip behavior at higher shear rates: The stress decreased with an increase in the shear rate, and it gradually increased again and approached the stress under no electric field. The apparent conductivity, which was sensitively probed by the conduction current passing through the ER suspension, showed a dip behavior. Further, the apparent conductivity showed a local maximum, which was not found for the ER suspensions with particle concentrations of 10 and 30 wt%.

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“…6 The presence of water leads to dielectric breakdown, corrosion and high power consumption for ER systems with substantial quantity of water. 7 Recently, aluminosilicate 8 and poly(acene quinones) 9 were proposed as particulates to be used in 494 dry-based ER fluids. In dry-based ER suspensions, the mechanisms of "water bridging" between particles and interaction of electric double layers are not possible; the most probable mechanism would be stringing of the polarized particles.…”

Section: The Equation For a Bingham Body Is R=ry+1/pi·ymentioning

confidence: 99%

Design of Anhydrous Electrorheological Suspensions Based on Phosphate Cellulose

Ahn

Choi

Kwon

1999

Polym J

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ABSTRACT:The electrorheological (ER) behavior of suspensions in silicone oil of phosphate cellulose particles (average particle size: 17.77 Jlm) was investigated at room temperature with electric fields up to 2.5kVmm-1 . For development of anhydrous ER suspensions for use at wide temperature range, it was sought the effect of the phosphate-ester reaction of celluloses on ER activity. Current density and conductivity of anhydrous ER suspensions of phosphate cellulose particles could be controlled by varying phosphoric acid concentration in phosphate-ester reactions of cellulose. When cellulose particles were treated by the phosphoric acid between 2.5 M and 3.0 M, ER suspensions containing phosphate cellulose particle electrorheological effect (r:Air: 0 ) was greatest.KEY WORDS Anhydrous Electrorheological Suspension I Phosphate-Ester Reaction of Cellulose I Electrorheological Effect ( r: Alr: 0 ) I Dielectric Constant I Current Density I Electrical Conductivity IThe influence of electric fields on the deformation and flow properties of materials has been of interest for many years. Recently, there has been renewed interest in a particular branch of these electric field effects: the electrorheological effect (ER effect). The ER effect is sometimes called the Winslow effect, after Willis Winslow who described it first. 1 Winslow found that strong electric field application to nonaqueous silica suspensions activated with a small amount of water caused rapid solidification of the originally fluid material.Rheological parameters which describe ER transition are dynamic yield stress and steady shear viscosity. Till quite recently, electrorheological fluids have been modeled as Bingham plastics. 2 -4 This means that flow is observed only after exceeding a minimum yield stress. The equation for a Bingham body is r=ry+1/pi·yWhere ry is dynamic yield stress, 1/pi plastic viscosity, and y shear rate. Application of an electric field to ER fluid, dynamic yield stress increases dramatically while plastic viscosity remains essentially unchanged. Useful characteristics of ER suspensions which show Bingham plastics are dynamic yield stress dependent upon intensity of an electric field, whose variation range is large, step less and reversible, and response time is very fast (approximately 1 ms). 5 Generally, ER suspensions which show electrorheological effect may be divided as wet-based and dry-based ER suspensions. In wet-based ER suspensions, water is a required dopant to activate the suspension. The role of water in the ER effect has remained unidentified as well as the difficulty in practical device design. One primary disadvantage of wet-based ER suspensions is the limited temperature range of usage. Presumably, viscous and conductive heating of the fluid causes the eventual loss of water result in loss of ER activity on the electric fields. 6 The presence of water leads to dielectric breakdown, corrosion and high power consumption for ER systems with substantial quantity of water. 7 Recently, aluminosilicate 8 and poly(ace...

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An intrinsic mechanism for the activity of alumino‐silicate based electrorheological materials

Cited by 143 publications

References 0 publications

The Conductivity Confined Temperature Dependence of Water-Free Electrorheological Fluids

The Conductivity Confined Temperature Dependence of Water-Free Electrorheological Fluids

Simultaneous Measurement of Rheological Behavior and Conduction Current for an Electro-Rheological Suspension with Cation Exchange Resin Particles.

Design of Anhydrous Electrorheological Suspensions Based on Phosphate Cellulose

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