Modeling Transport and Mechanics in Anion Exchange Membranes to Optimize Continuous CO2 Separations
Abstract
Water transport in charged polymer membranes is strongly influenced by hydration-dependent transport properties and polymer-network deformation. Under water-activity gradients, spatial variations in water concentration induce swelling and mechanical stresses, while the resulting deformation can influence water transport. Capturing this bidirectional interaction is important for predicting membrane behavior under nonuniform hydration conditions. This study develops a transient finite element model of water transport and mechanical deformation in a Fumasep FAA-3-50 anion exchange membrane. The framework incorporates concentration-dependent water diffusivity, hygroscopic swelling, and nonlinear viscoelastic polymer response. Uncoupled, one-way coupled, and fully coupled formulations are compared to distinguish the effects of hydration-dependent diffusivity and mechanical coupling. In the fully coupled model, local water concentration governs swelling and mechanical response, while deformation, evolving membrane geometry, and mechanical pressure feed back into water transport. Simulations predict spatially and temporally nonuniform swelling and deformation that track the evolving water-concentration field. Relative to the uncoupled concentration-dependent diffusion model, mechanical feedback alters the predicted transport response, although transport remains primarily diffusion-driven. The fully coupled model is validated against steady-state water-transport measurements across water-activity gradients and reproduces the experimentally observed hydration dependence, with strongest agreement at intermediate hydration levels. These results highlight the importance of coupled hydration, swelling, deformation, and transport processes in models of hydrated anion exchange membranes and provide a framework for evaluating membrane behavior in moisture-facilitated transport applications.
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BibTeX
@misc{bayati2026modeling,
title = {{Modeling Transport and Mechanics in Anion Exchange Membranes to Optimize Continuous CO2 Separations}},
author = {Samaneh Bayati and Jennifer Wade and Sara Sarbaz and Heidi Feigenbaum and Horacio Lopez-Marques and Winston Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20812},
eprint = {2610.20812},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20812},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Modeling Transport and Mechanics in Anion Exchange Membranes to Optimize Continuous CO2 Separations
AU - Samaneh Bayati
AU - Jennifer Wade
AU - Sara Sarbaz
AU - Heidi Feigenbaum
AU - Horacio Lopez-Marques
AU - Winston Wang
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20812
UR - https://arxiv.org/abs/2610.20812
AB - Water transport in charged polymer membranes is strongly influenced by hydration-dependent transport properties and polymer-network deformation. Under water-activity gradients, spatial variations in water concentration induce swelling and mechanical stresses, while the resulting deformation can influence water transport. Capturing this bidirectional interaction is important for predicting membrane behavior under nonuniform hydration conditions. This study develops a transient finite element model of water transport and mechanical deformation in a Fumasep FAA-3-50 anion exchange membrane. The framework incorporates concentration-dependent water diffusivity, hygroscopic swelling, and nonlinear viscoelastic polymer response. Uncoupled, one-way coupled, and fully coupled formulations are compared to distinguish the effects of hydration-dependent diffusivity and mechanical coupling. In the fully coupled model, local water concentration governs swelling and mechanical response, while deformation, evolving membrane geometry, and mechanical pressure feed back into water transport. Simulations predict spatially and temporally nonuniform swelling and deformation that track the evolving water-concentration field. Relative to the uncoupled concentration-dependent diffusion model, mechanical feedback alters the predicted transport response, although transport remains primarily diffusion-driven. The fully coupled model is validated against steady-state water-transport measurements across water-activity gradients and reproduces the experimentally observed hydration dependence, with strongest agreement at intermediate hydration levels. These results highlight the importance of coupled hydration, swelling, deformation, and transport processes in models of hydrated anion exchange membranes and provide a framework for evaluating membrane behavior in moisture-facilitated transport applications.
ER -