Simultaneous electroosmotic and permeation flows through a Nafion membrane

Barragán, V.M.; Ruı́z-Bauzá, C.; Villaluenga, J.P.G.; Seoane, B.

doi:10.1016/j.jcis.2005.03.019

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…In the last sections, the various transport properties have been reviewed and discussed; in this section, we examine some of the possible relationships between transport and structural features, especially at the nanoscale. The complex nature structuretransport interplay in PFSAs has also stimulated investigations on various aspects of transport-property correlations, including, but not limited to, diffusion/relaxation, 128,380 self-diffusion/ conductivity (i.e., ion and water transport, see section 4.2.3), 44,53,95,191,244,269,502,603,621 diffusion/free-volume effects, 297,510,531,622 diffusion/nanostructure (e.g., nanoswelling of domains), 17,116,217,429 diffusion/interfacial effects (e.g., conductive AFM, see section 4.1.5), 256,275,486,487 diffusion/ permeability, 518 permeation/electro-osmosis, 548 coupling of stretching and (anisotropic) self-diffusion/conductivity (section 3.1.5 and 4.2.2), 296,369,404,536 structure/conductivity under compression 257 and tension, 335 chain dynamics and transport (e.g., dielectric spectroscopy 2,133,603,623 ) as well as structure/ w at e r d y n a m i c s ( e . g .…”

Section: Nanoscale Correlationsmentioning

confidence: 99%

New Insights into Perfluorinated Sulfonic-Acid Ionomers

2017

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In this comprehensive review, recent progress and developments on perfluorinated sulfonic-acid (PFSA) membranes have been summarized on many key topics. Although quite well investigated for decades, PFSA ionomers' complex behavior, along with their key role in many emerging technologies, have presented significant scientific challenges but also helped create a unique cross-disciplinary research field to overcome such challenges. Research and progress on PFSAs, especially when considered with their applications, are at the forefront of bridging electrochemistry and polymer (physics), which have also opened up development of state-of-the-art in situ characterization techniques as well as multiphysics computation models. Topics reviewed stem from correlating the various physical (e.g., mechanical) and transport properties with morphology and structure across time and length scales. In addition, topics of recent interest such as structure/transport correlations and modeling, composite PFSA membranes, degradation phenomena, and PFSA thin films are presented. Throughout, the impact of PFSA chemistry and side-chain is also discussed to present a broader perspective.

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Section: Nanoscale Correlationsmentioning

confidence: 99%

New Insights into Perfluorinated Sulfonic-Acid Ionomers

2017

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“…Finally, it is worth mentioning that the conclusion, coming from experimental and simulations studies of the electro-osmotic drag factor in the water-rich region, that the electro-osmotic drag factor is much lower than that of water (Ji et al, 2008;Hallberg et al, 2010), is only valid when the relative contribution of water and methanol in the membrane is considered. Regarding the opposite tendency observed for the electro-osmotic drag coefficient of water-methanol in Nafion in the K + form (Barragan et al, 2005), it is probably related to a change of the Nafion nanostructure when H + is replaced with a less solvated cation and mainly to the fact that the solvation by methanol is much weaker than that by water for K + ions.…”

Section: Electro-osmotic Drag Coefficients Of Water-methanol Mixtures...mentioning

confidence: 73%

“…There are no further studies of the electro-osmotic flow of water-methanol mixtures in Nafion, except for those reported by the group of Barragan (Barragán et al, 2004a;Barragán et al, 2004b;Barragan et al, 2005) that measured the electro-osmotic permeability, W in Eq. 1, of water-methanol mixtures in Nafion membranes in the K + form at 25 °C.…”

Section: Introductionmentioning

confidence: 99%

“…We determined the electro-osmotic flow of methanol-water mixtures through a Nafion 117 membrane on the entire composition range, from pure water to pure methanol, at different temperatures in the interval of 25-60 °C. The method used is the two-compartment capillary cell (TCCC), the most used for these systems, and it was first used by Zawodzinski et al (Zawodzinski et al, 1993a;Zawodzinski et al, 1993b) for electroosmosis studies of water in Nafion and later by Meier and Eigenberger (Meier and Eigenberger, 2004), Barragan et al (Barragán et al, 2004a;Barragán et al, 2004b;Barragan et al, 2005), and Pivovar et al (Pivovar et al, 2005). The results shed some light on the composition and temperature dependence of the electro-osmotic flow of water-methanol through Nafion.…”

Section: Introductionmentioning

confidence: 99%

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Electro-Osmotic Flow of Water–Methanol Mixtures Through Nafion Membranes Revisited: Composition and Temperature Dependence

Corti

Trevani

2022

Front. Energy Res.

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The electro-osmotic drag coefficient of water and methanol mixtures through Nafion 117 membranes was measured as a function of the composition at several temperatures between 25 and 60°C using a two-compartment capillary cell with Ag/AgCl electrodes. The electro-osmotic water drag in HCl aqueous solutions is higher than that reported in measurements where the membrane is in contact with pure water; hence, all the reported results were performed at the same acid concentration. It was found that the drag coefficient for pure methanol is about 40% higher than that for water at all the temperatures studied as a consequence of the expanded nanostructure of Nafion in methanol. The drag coefficients of the water–methanol mixtures exhibit a high non-linearity, which can be explained by considering the Nafion sorption in the binary solvent. The electro-osmotic flow in pure methanol is similar to that of 5 M methanol aqueous solutions, which opens the opportunity to use pure methanol in DMFCs. The methanol crossover due to permeability can be minimized. Controversial results with previous studies are also addressed.

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“…In other words, the perfluorinated membrane tends to dehydrate from the anode side, which leads to a loss of proton conductivity, while flooding from the cathode side can make it difficult to supply the reagent gas. Thus, the regulation of water transport in a proton-conducting perfluorinated membrane is a serious problem in the development of stable operation of fuel cells [ 17 , 18 , 19 ], and the study of electroosmotic and osmotic transport through Nafion-type membranes is an urgent task for both experimenters and theorists [ 20 , 21 ]…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of Joint Osmotic and Electroosmotic Water Transfer through a Cation-Exchange Membrane

Филиппов

Shkirskaya

2022

IJMS

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Using the previously developed cell model of a charged membrane and the principles of linear thermodynamics of irreversible processes (the Onsager approach), exact and approximate (in the case of an ideally selective membrane) analytical formulae for calculating the osmotic and electroosmotic permeability of the membrane in aqueous solutions of 1:1 electrolyte at constant electric current density and concentration gradient were suggested. The formulae have been successfully verified by our own experimental data for the extrusion cation-exchange membrane MF−4SC p.29 in NaCl solution up to concentrations of 3 M. The contribution of electroosmotic and osmotic water fluxes to the total water transport through the mentioned individual perfluorinated ion-exchange membrane under conditions close to the process of electrodialysis concentrating was experimentally estimated. The cases of co- and counter-directed osmotic and electroosmotic water fluxes are studied. A good correspondence between theoretical and experimental results was obtained, which made it possible to determine the physicochemical parameters of the electromembrane system (the diffusion coefficients of individual ions and the coefficient of equilibrium distribution of electrolyte molecules in the membrane matrix, the characteristic exchange capacity of the cell model). The achieved results make it possible to fully characterize existing and promising types of ion-exchange membranes based on the developed cell model of a charged membrane.

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Simultaneous electroosmotic and permeation flows through a Nafion membrane

Cited by 5 publications

References 15 publications

New Insights into Perfluorinated Sulfonic-Acid Ionomers

New Insights into Perfluorinated Sulfonic-Acid Ionomers

Electro-Osmotic Flow of Water–Methanol Mixtures Through Nafion Membranes Revisited: Composition and Temperature Dependence

Theoretical and Experimental Study of Joint Osmotic and Electroosmotic Water Transfer through a Cation-Exchange Membrane

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