Aqueous ion partitioning in Nafion: Applicability of Manning's counter-ion condensation theory

Sujanani, Rahul; Katz, Lynn E.; Paul, Donald R; Freeman, Benny D.

doi:10.1016/j.memsci.2021.119687

Cited by 27 publications

(33 citation statements)

References 98 publications

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“…Sujanani et al attributed this discrepancy to incomplete ion dissociation in the solution and membrane phases. In aqueous solutions, it is known that Na 2 SO 4 does not dissociate completely, particularly when the electrolyte concentration is higher than 0.03 M. 88 Similarly to Peng and Zawodzinski treating H 2 SO 4 as a monoprotic acid, 87 these authors explored the same assumption. Sujanani et al reported that assuming…”

Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

“…Using their own Na 2 SO 4 partitioning data and literature partitioning data for H 2 SO 4 measured over the same range, 89 the importance of accounting for effects like ion pairing when they are present. 82,87,88 Beyond Nafion 117, additional membranes were utilized by the Freeman and Paul groups to test the predictive power of the Donnan-Manning model for heterogeneous materials. Cross-linked IEMs were synthesized in sets of three membranes each, wherein experimental ion partitioning data were collected for two sets of heterogeneous CEMs and one set of relativelyhomogeneous AEMs.…”

Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

“…2À electrolytes in Nafion 117 versus the external solution concentration. 88 The lines on both plots represent predictions by the Donnan-Manning model. The red lines were generated by assuming full dissociation of the electrolytes (i.e., the co-ions were treated as SO 4 2À ), while the blue lines were generated by assuming half dissociation of the electrolytes (i.e., the co-ions were treated as HSO…”

Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

“…The RMS Log Error for predictions made by the Donnan-Manning model for NaCl partitioning in various IEMs with broad sets of properties. 22,58,60,76,77,80,84,85,88,90 The abscissa is the fixed charge concentration, C m,t A , as reported for membranes equilibrated with DI water or the most dilute NaCl solution used in the study. The color of each data point indicates the water volume fraction, ϕ w , when measured under the same conditions.…”

Section: F I G U R E 1mentioning

confidence: 99%

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Manning condensation in ion exchange membranes: A review on ion partitioning and diffusion models

Kitto

Kamcev

2022

Journal of Polymer Science

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The rational design of ion exchange membranes (IEMs) is becoming more pertinent as their usage becomes broader and as their staple applications (i.e., electrodialysis, flow batteries, and fuel cells) improve in commercial viability. Such efforts would be catalyzed by an improved fundamental understanding of ion transport in IEMs. This review discusses recent progress in modeling ion partitioning and diffusion in IEMs in an effort to relate IEM performance metrics to fundamental membrane properties over which researchers and membrane manufacturers possess direct and sometimes precise control. Central focus is given to the Donnan‐Manning model for ion partitioning and the Manning‐Meares model for ion diffusion in IEMs. These two frameworks, which are derived from Manning's counter‐ion condensation theory for polyelectrolyte solutions, have been widely used within the IEM literature since their recent introduction. To explore this topic, the mathematical derivation of both models is revisited, followed by a survey of experimental and computational discussions of counter‐ion condensation in IEMs. Alternative models which fulfill similar roles in predicting IEM transport properties are compared. This review concludes by highlighting the uniquely favorable positions of the Donnan‐Manning and Manning‐Meares models and discussing their prospects as leading predictors of IEM partitioning and diffusive properties.

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Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

Section: Ion Partitioning In Heterogeneous Membranesmentioning

confidence: 99%

Section: F I G U R E 1mentioning

confidence: 99%

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Manning condensation in ion exchange membranes: A review on ion partitioning and diffusion models

Kitto

Kamcev

2022

Journal of Polymer Science

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“…First, all arguments thus far have been made for the limiting case of ions at or near infinite dilution. Thus, ion pairing (both static and dynamic) is not taken into account despite that it can, in certain situations, exhibit a significant influence on salt partitioning and transport in membranes. , In addition, the assumption of infinite dilution indicates that our physical picture, and the arguments that follow, is not applicable in the limiting case of complete saturation of binding sites. Such a scenario may be of practical interest, since many salt brines are nearly saturated in certain salt species .…”

Section: Physical Picture Of Ion Permeability In Lfpmsmentioning

confidence: 99%

Cation–Ligand Interactions Dictate Salt Partitioning and Diffusivity in Ligand-Functionalized Polymer Membranes

et al. 2022

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Membranes are an attractive alternative to current thermal separations due to their scalability and energy efficiency in desalinating water. Unfortunately, many of the conventional membrane materials available today are unable to differentiate between ionic solutes, especially alkali cations, compromising their use in ion−ion separations. Inspired by the ion-specific interactions exhibited by biological ion channels, recent research efforts have focused on synthesizing and characterizing new polymeric materials that incorporate ligands into polymer networks to bias solubility and/or diffusivity of one cationic species over another. Despite these efforts, little is known about the influence of incorporating ligands into polymer membranes on solubility and diffusivity of the complexing species. In this study, we first build a qualitative model of salt partitioning, diffusivity, and permeability in generic cationcomplexing ligand-functionalized polymer membranes. Next, to validate our model and hypotheses, we perform atomistic molecular dynamics simulations of a 12-crown-4-functionalized membrane in the presence of alkali halide salts at low concentration. Generally, cation complexation enhances cation solubility but decreases diffusivity. Interestingly, the reduction in diffusivity is predicted to be larger than the enhancement in solubility for materials which operate by the mechanisms proposed in our physical picture, ultimately resulting in a reduction in the permeability of the selectively complexing ion.

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Solar driven thermal responsive polyionic liquid/PDDA semi-IPN hydrogel for near-room temperature membrane-free osmotic desalination

Yuan,

Jiang,

Zhou

et al. 2024

Chemical Engineering Journal

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Aqueous ion partitioning in Nafion: Applicability of Manning's counter-ion condensation theory

Cited by 27 publications

References 98 publications

Manning condensation in ion exchange membranes: A review on ion partitioning and diffusion models

Manning condensation in ion exchange membranes: A review on ion partitioning and diffusion models

Cation–Ligand Interactions Dictate Salt Partitioning and Diffusivity in Ligand-Functionalized Polymer Membranes

Solar driven thermal responsive polyionic liquid/PDDA semi-IPN hydrogel for near-room temperature membrane-free osmotic desalination

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