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• W1982722396 abstract "The results of extensive all-atom molecular dynamics (MD) simulations of water- and methanol-solvated SPEEK (sulfonated poly(ether ether ketone)) are reported. In this Part II of the two-part article, we present results elucidating the spatial distributions of hydronium ion (vehicular proton) and methanol and the transport properties of water, hydronium ions, and methanol. Our results suggest that hydronium ions escape attraction shells of sulfonic groups with increasing water and methanol contents but move closer to sulfur with an increase in temperature. The localization of the hydronium ion near sulfonate anion was seen to be significantly more pronounced than in Nafion, suggesting stronger basicity of sulfonate anion and therefore weaker acidity of its conjugate acid in SPEEK than in Nafion. In contrast with Nafion, methanol competes with hydronium ions and water to solvate sulfonate anion and also lies closer to aromatic backbone. Water diffusion coefficients follow experimentally observed trends where they are lower in SPEEK than in Nafion at low water weight percent but approach the Nafion values at higher water weight percent. The vehicular proton diffusivity, as quantified by hydronium ion diffusivity, was found to be an order of magnitude lower than that in Nafion. The transport results are rationalized based on the structural insights presented in Part I and the present article." @default.
• W1982722396 created "2016-06-24" @default.
• W1982722396 creator A5036212380 @default.
• W1982722396 creator A5048049212 @default.
• W1982722396 date "2010-06-10" @default.
• W1982722396 modified "2023-09-25" @default.
• W1982722396 title "Atomistic Simulations of Structure of Solvated Sulfonated Poly(ether ether ketone) Membranes and Their Comparisons to Nafion: II. Structure and Transport Properties of Water, Hydronium Ions, and Methanol" @default.
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• W1982722396 doi "https://doi.org/10.1021/jp1040794" @default.
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