dorsal/arxiv
View SchemaElectrical controlled rheology of a suspension of weakly conducting particles in dielectric liquid
| Authors | Quentin Guegan, J. -N. Foulc, F. Ayela, O. Tillement |
|---|---|
| Categories | |
| ArXiv ID | physics/0607158 |
| URL | https://arxiv.org/abs/physics/0607158 |
Abstract
The properties of suspensions of fine particles in dielectric liquid (electrorheological fluids) subjected to an electric field lead to a drastic change of the apparent viscosity of the fluid. For high applied fields (~ 3-5 kV/mm) the suspension congeals to a solid gel (particles fibrillate span the electrode gap) having a finite yield stress. For moderate fields the viscosity of the suspension is continuously controlled by the electric field strength. We have roposed that in DC voltage the field distribution in the solid (particles) and liquid phases of the suspension and so the attractive induced forces between particles and the yield stress of the suspension are controlled by the conductivities of the both materials. In this paper we report investigation and results obtained with nanoelectrorheological suspensions: synthesis of coated nanoparticles (size ~ 50 to 600 nm, materials Gd2O3:Tb, SiOx...), preparation of ER fluids (nanoparticles mixed in silicone oil), electrical and rheological characterization of the ER fluids. We also propose a possible explanation of the enhanced ER effect (giant ER fluids) taking into account the combined effects of the (nano)size of the particles, the Van der Waals forces between particles in contact and the electrostatic pressure in a very thin layer of insulating liquid.
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"abstract": "The properties of suspensions of fine particles in dielectric liquid\n(electrorheological fluids) subjected to an electric field lead to a drastic\nchange of the apparent viscosity of the fluid. For high applied fields (~ 3-5\nkV/mm) the suspension congeals to a solid gel (particles fibrillate span the\nelectrode gap) having a finite yield stress. For moderate fields the viscosity\nof the suspension is continuously controlled by the electric field strength. We\nhave roposed that in DC voltage the field distribution in the solid (particles)\nand liquid phases of the suspension and so the attractive induced forces\nbetween particles and the yield stress of the suspension are controlled by the\nconductivities of the both materials. In this paper we report investigation and\nresults obtained with nanoelectrorheological suspensions: synthesis of coated\nnanoparticles (size ~ 50 to 600 nm, materials Gd2O3:Tb, SiOx...), preparation\nof ER fluids (nanoparticles mixed in silicone oil), electrical and rheological\ncharacterization of the ER fluids. We also propose a possible explanation of\nthe enhanced ER effect (giant ER fluids) taking into account the combined\neffects of the (nano)size of the particles, the Van der Waals forces between\nparticles in contact and the electrostatic pressure in a very thin layer of\ninsulating liquid.",
"arxiv_id": "physics/0607158",
"authors": [
"Quentin Guegan",
"J. -N. Foulc",
"F. Ayela",
"O. Tillement"
],
"categories": [
"physics.chem-ph",
"physics.atm-clus"
],
"title": "Electrical controlled rheology of a suspension of weakly conducting particles in dielectric liquid",
"url": "https://arxiv.org/abs/physics/0607158"
},
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