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- W2072606906 abstract "A dual-sorption-site model in which both miscible and phase-separated water droplets are present in ion-selective, poly(vinyl chloride) (PVC)-based membranes is applied to data obtained for the H2O concentration profiles during the later stages of water uptake. A finite difference algorithm for calculating the concentration profiles is presented, and the calculated curves are shown to match the experimental data over the entire equilibration period. A relaxation process is identified which is associated with an increasing content of immobilized H2O, Cim, as described by Cim = C°im(1 − y e-βt), where y = 0.7, β = 0.27 h-1 for membranes with about 45 mM salt added, and y = 0.6, β = 0.40 h-1 with 5 mM added salt. Calculations are presented showing water equilibration times required for 40−100 μm thick membranes contacted by water on both sides, a solid on one side, or a 10−40 μm thick hydrogel serving as an inner electrolyte reservoir on one side. For membranes thinner than 200 μm that are contacted on both sides by H2O, the slow relaxation phenomenon dominates water uptake rather than the diffusion process. The presence of an internal reservoir, which must be hydrated by transport across the membrane, slows equilibration drastically." @default.
- W2072606906 created "2016-06-24" @default.
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- W2072606906 date "1996-01-01" @default.
- W2072606906 modified "2023-10-16" @default.
- W2072606906 title "Comparison of Numerical Modeling of Water Uptake in Poly(vinyl chloride)-Based Ion-Selective Membranes with Experiment" @default.
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- W2072606906 doi "https://doi.org/10.1021/ac9505583" @default.
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