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• W2043132310 abstract "Abstract The diffusion coefficient (DPV2+) and the concentration (CaPV2+) of the actually electroactive PV2+ in the poly(ethylene oxide) (PEO, average molecular weight: 400) media containing 0.1 M LiClO4 and various concentrations of propyl viologen dibromide (PVBr2) could be separately estimated without previous knowledge of either, based on a combined use of steady-state cyclic voltammetry at carbon fiber electrodes (diameter: 9 μm) and potential-step chronoamperometry at glassy carbon electrodes (diameter: 1 mm) as a function of PVBr2 concentration (CPV2+ = 2–20 mM) and temperature (10–60°C). Both CaPV2+ and DPV2+ significantly varied with CPV2+ CaPV2+ values were smaller than CPV2+, indicating that all of the dissolved PVBr2 are not actually electroactive. DPV2+ decreased with increasing CPV2+ (and CaPV2+), and the charge transport in the PEO matrix was thus found to occur not via the electron-hopping process between PV2+ and PV+ (the monocation state of PV2+), but via the physical diffusion of PV2+. Further, it became apparent that at CPV2+ > 5 mM the temperature dependence of DPV2+ is not the Arrhenius type and follows the VTF equation, that is, PV2+ ions are transported along with the segmental motion of the PEO chains. Based on the DSC measurements of the PEOLiClO4 (0.1 M)PVBr2 complexes, their glass transition temperatures were found to decrease with increasing CPV2+, suggesting that PVBr2 functions as a plasticizer." @default.
• W2043132310 created "2016-06-24" @default.
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• W2043132310 date "1994-10-01" @default.
• W2043132310 modified "2023-09-27" @default.
• W2043132310 title "A study on diffusional behavior of propyl viologen in poly(ethylene oxide) polymer solvents based on a combined use of steady-state cyclic voltammetry and potential-step chronoamperometry" @default.
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• W2043132310 doi "https://doi.org/10.1016/0013-4686(94)00237-1" @default.
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