Abstract
Room temperature ionic conductivities and viscosities of polyethylene glycol (PEG, av. mol.wt. 400) electrolytes involving CaBr 2, CoBr 2, ZnBr 2 and CdBr 2 were measured as a function of salt concentration. Conductivities were roughly 10 −5S/cm and decreased in the order CaBr 2 > CoBr 2 > CdBr 2 > nBr 2. Viscosities decreased in the order CaBr 2 > CoBr 2 > ZnBr 2≈CdBr 2. These trends were explained with a model involving cationic crosslinkers and anionic charge carriers. A hypothesized trend in salt dissociation, based on the relative viscosity increase, was found to be consistent with several other studies involving the same divalent cations in various electrolyte systems.
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