Surfactant-Switched Positive/Negative Electrorheological Effect in Tungsten Oxide Suspensions.

ABSTRACT: The electrorheological (ER) effect was experimentally observed in dielectric suspensions containing tungsten oxide (WO3) modified with surfactant molecules (sodium dodecyl sulfate (SDS) and dodecylamine (DDA)) in electric fields up to several kilovolts per millimeter. The dielectric properties of WO3 suspensions in silicone oil were analyzed, depending on the frequency of the electric field, in the range from 25 to 106 Hz. Unmodified WO3 suspensions, as well as suspensions modified with sodium dodecyl sulfate, were shown to exhibit a positive electrorheological effect, whereas suspensions modified with dodecylamine demonstrated a negative electrorheological effect. The quantitative characteristics of the negative electrorheological effect in the strain-compression and shear regimes were ob

SUBMITTER: Agafonov AV 

PROVIDER: S-EPMC6767292 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature