Electrorheological characterization of zeolite suspensions

Electrorheological Fluids

“…The yield stress of such an ER material can easily reach 10 kPa at 2.5 kV/mm and a particle loading of 45 wt.-%. Aluminosilicates encompass a family of zeolite materials of metal cation or a mixture of metal cations of average valence charge n; x, y, and w are integers), including clay (saponite or montmorillonite); [43] zeolite 3A, 5A, and X-type; [44,45] and various molecular sieves. [46±48] Plenty of these materials are commercially available and can be modified in various aspects with regard to the crystal structure, cation composition, and particle size and shape, etc., and constitute a large number of ER fluids.…”

Magnetorheological Fluids Based on Ionic Liquids

“…Note that the observed singular behavior in the flow curve of Figure 3D (MRF3) at low shear rates and relatively high intensities of a magnetic field has been previously reported and explained for some cases of the so-called electrorheological fluids (ERFs). [44][45][46][47][48] These situations show that the shear stress developed by the applied magnetic field (or electric field in the cases of ERFs) slightly decreases as the shear rate increases up to a certain transition value, and thereafter it starts to increase again. Similar to the reported cases of ERFs, [45] in the MRF of Figure 3D these transition points were observed at higher shear rates when the magnetic field strength was increased.…”

“…[44][45][46][47][48] These situations show that the shear stress developed by the applied magnetic field (or electric field in the cases of ERFs) slightly decreases as the shear rate increases up to a certain transition value, and thereafter it starts to increase again. Similar to the reported cases of ERFs, [45] in the MRF of Figure 3D these transition points were observed at higher shear rates when the magnetic field strength was increased. The decrease in shear stress below a critical shear rate might be a consequence of the destruction rate of the particle chain structures exceeding the reformation rate of the particle chains, as the shear rates are increased.…”

Investigation of electrorheological properties of kaolin suspensions under DC fields

“…Another target is for ER fluids with long service stabilities, particularly at high temperatures and rigid environmental conditions. 6 Among various polarizable particles for dry-base ER materials, semiconducting polymers, including poly(acene quinone) radicals, 7 polyaniline, 8 copolyaniline, 9 polyphenylenediamine, 10 poly(2-acrylamido-2-methyl-1-propane sulfonic acid), 11 polyaniline nanocomposite, 12 and polyacrylonitrile/diatomite composites, 13 poly(Li-HEMA)-co-poly(4-vinyl pyridine) copolymeric salt suspensions in the SO, 14,15 PMMA-b-PSt, 16 and poly(Li-2-hydroxyethyl methacrylate)/SO system, 17 have been adopted as dry-base ER fluids as a result of handling and superior physical properties.…”