Effect of frequency on a water-activated electrorheological fluid in an a.c. electric field

The Interfacial Polarization-Induced Electrorheological Effect

“…We expect that the suspension with low conductive particles would gradually be ER inactive when the applied field frequency increases to such an extent that the fluid dielectric constant falls dramatically. The shear stress of ER fluid decreases with frequency increasing has been witnessed in many ER suspensions (15,16,20,25). We also measured the yield stress of the OP suspension under different frequency fields and found that it decreases with increasing frequency (see Fig.…”

Rheological properties of a model colloidal suspension under large electric fields of different waveforms

“…When ν is large enough, dipoles are no longer able to follow the direction of the electric field so that a great number of them are randomly distributed. As a consequence, only rather small groups of particles can aggregate and the magnitude of the ER activity decreases [37][38][39]. In Ref.…”

Correlation of the Dielectric Properties of Dispersed Particles with the Electrorheological Effect

“…will become ER inactive in high frequency fields because its dielectric loss will decrease with frequency to a value Although large dielectric loss was thought to be needed for a strong ER response, too large a dielectric loss is of too small to generate an ER effect. In this ER suspension, we will find that the shear stress decreases with frequency, course not adequate; otherwise the suspension would give off a great deal of heat, resulting in too strong particle therwhich has been already witnessed in many ER suspensions (13, 14,(35)(36)(37)(38). However, if an ER suspension has a low mal motion, which would destroy fibrillated chains and lead to a weak ER effect.…”