Characterization of ion-exchange membrane materials: Properties vs structure

Березина, Н. П.; Kononenko, N. A.; Dyomina, O.A.; Gnusin, N. P.

doi:10.1016/j.cis.2008.01.002

Cited by 376 publications

(239 citation statements)

References 70 publications

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“…As the physical meaning of the water drag coefficient k w is rather close to that of the water transference number t w , the comparison of both transport numbers can be a good test to check the reliability of the indirect method presented in this present paper for water transport number evaluation. The water transport number reported for MK40 in NaCl solutions ranged from 10 to 5 depending on the salt concentration [7,29], which is very close to the value obtained in the present study. The water transport number for a CMX membrane equilibrated with a NaCl solution obtained in the present study is the same value as reported by Larchet et al [7] Fig.…”

Section: Streaming Potentialsupporting

confidence: 79%

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Somovilla

Villaluenga

Barragán

et al. 2016

Journal of Membrane Science

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a b s t r a c tLiquid uptake and streaming potential have been determined in aqueous sodium chloride solutions for five different commercial sulfonated polymer cation-exchange membranes. The selected membranes have distinct morphologies and electrochemical properties. Differences in the liquid uptake properties of the membranes have been found, which have been analysed on the basis of the structure and the chemical properties of the membranes. In most of the membranes analyzed, the higher the liquid content of the membranes, the lower the effective concentration of fixed charges in the membranes. The streaming potential across the membranes increases linearly with the established pressure difference, and it is larger in heterogeneous membranes than in homogeneous ones. In general, the higher the membrane liquid content, the higher the streaming potential across the membranes.

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Section: Streaming Potentialsupporting

confidence: 79%

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Somovilla

Villaluenga

Barragán

et al. 2016

Journal of Membrane Science

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show abstract

“…By combining the electroneutrality in the membrane with (43) and (44), (45) is derived. After rearrangement of (45), a quadratic expression for K is obtained, see (46).…”

Section: Appendix 2: Transport Equationsmentioning

confidence: 99%

Nernst–Planck modeling of multicomponent ion transport in a Nafion membrane at high current density

et al. 2016

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A mathematical model of multicomponent ion transport through a cation-exchange membrane is developed based on the Nernst-Planck equation. A correlation for the non-linear potential gradient is derived from current density relation with fluxes. The boundary conditions are determined with the Donnan equilibrium at the membranesolution interface, taking into account the convective flow. Effective diffusivities are used in the model based on the correlation of tortuosity and ionic diffusivities in free water. The model predicts the effect of an increase in current density on the ion concentrations inside the membrane. The model is fitted to the previously published experimental data. The effect of current density on the observed increase in voltage drop and the decrease in permselectivity has been analyzed using the available qualitative membrane swelling theories. The observed nonlinear behavior of the membrane voltage drop versus current density can be explained by an increase in membrane pore diameter and an increase in the number of active pores. We show how the membrane pore diameter increases and dead-end pores open up when the current density is increased.

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“…[15][16][17] However, in spite of such significant amount of work, nanoscale details about the molecular structure of ion-exchange membranes and the proton transport mechanism remain essentially unknown. Although theoretical studies based on molecular dynamics (MD) simulations are expected to be important not only for the elucidation of details about the protons transport across membranes but also for the design of good performance conducting membranes, the number of reported investigations is relatively scarce.…”

Section: Introductionmentioning

confidence: 99%

Field-Induced Transport in Sulfonated Poly(styrene-co-divinylbenzene) Membranes

et al. 2010

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Atomistic simulations have been carried to investigate electric field induced transport of hydronium ions in a sulfonated poly(styrene-co-divinylbenzene) membrane. In order to provide a good description of this cross-linked material, a methodology has been explicitly designed to construct a reliable model of the hydrated membrane. This model has been used to carry out molecular dynamics simulations in presence of electric fields, which varied from 0.001 to 3.0 V 3 nm -1 . Results show that the electric field affects the structure of the membrane producing both a redistribution of the unoccupied volume, which modifies the heterogeneity of the resin, and a rearrangement of the negatively charged sulfonate groups, which undergo a systematic alignment along the electric field direction. As was expected, the mobility of hydronium ions is enhanced with the strength of the electric field. Moreover, the electric field induces a significant rearrangement of the sulfonate groups, which is evidenced by the alignment of the C-S bonds along the direction of the field. The membrane has been found to behave as a spring, in which the force exerted by the electric field acts in opposite sense to the force exerted by the internal structure of the cross-linked material.

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Characterization of ion-exchange membrane materials: Properties vs structure

Cited by 376 publications

References 70 publications

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Experimental determination of the streaming potential across cation-exchange membranes with different morphologies

Nernst–Planck modeling of multicomponent ion transport in a Nafion membrane at high current density

Field-Induced Transport in Sulfonated Poly(styrene-co-divinylbenzene) Membranes

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