Electrolyte and Water Osmotic Flow Coefficients in Nafion Membranes

Scibona, G.; Radatti, Nunzia; Botrê, Claudio; Botrè, Francesco; Gavelli, G.

doi:10.1002/bbpc.19890930706

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Let us see this relaxation process in the membrane system composed of a Nafion 120 membrane immersed in a 10 mM aqueous solution of NaCl, as studied by Scibona et al [13][14][15] The coefficients L ij related to this problem are shown in Table I; these coefficients have been calculated in this paper with data provided in Ref. 15, Tables II and III. When we keep I ϭ 0 and ⌬p ϭ 5 ϫ 10 3 Pa constant, the flux J 2 depends exclusively on ⌬c 2 , as we can see in Fig.…”

Section: Relaxation Processesmentioning

confidence: 99%

Observable Streaming Potential in Membranes

Garrido

2003

J. Electrochem. Soc.

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Theories describing the electrokinetic processes in membranes usually involve nonobservable variables. One of these phenomena is the streaming potential, i.e., the electric potential generated by a pressure difference imposed across the membrane system. In this work the streaming potential is successfully described by using observable variables in the framework of thermodynamics of irreversible processes. The observable electric potential is the central quantity of the transport equations. The relaxation with time of this electric potential difference is well explained by the solute flux in these transport equations. The fluxes and forces defined in the formulation permit one to analyze the transport of the constituents through the membrane pores.

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Section: Relaxation Processesmentioning

confidence: 99%

Observable Streaming Potential in Membranes

Garrido

2003

J. Electrochem. Soc.

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“…We have emphasized before the advantages of the electric current being an independent quantity in the transport equations. Now we need to express j 1 , j + /ν + , and Δψ - in terms of Δμ 1 , Δμ 2 , and I . , A straightforward algebraic manipulation would lead to the phenomenological transport equations which also involves six transport coefficients.…”

Section: Electrodiffusion Processes In Membranesmentioning

confidence: 99%

“…Now we need to express j 1 , j + /ν + , and ∆ψ -in terms of ∆µ 1 , ∆µ 2 , and I. 2,13 A straightforward algebraic manipulation would lead to the phenomenological transport equations which also involves six transport coefficients.…”

Section: Experimental Determination Of the Phenomenologicalmentioning

confidence: 99%

Observable Quantities for Electrodiffusion Processes in Membranes

Garrido

2008

J. Phys. Chem. B

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Electrically driven ion transport processes in a membrane system are analyzed in terms of observable quantities, such as the apparent volume flow, the time dependence of the electrolyte concentration in one cell compartment, and the electrical potential difference between the electrodes. The relations between the fluxes and these observable quantities are rigorously deduced from balances for constituent mass and solution volume. These relations improve the results for the transport coefficients up to 25% with respect to those obtained using simplified expressions common in the literature. Given the practical importance of ionic transport numbers and the solvent transference number in the phenomenological description of electrically driven processes, the transport equations are presented using the electrolyte concentration difference and the electric current as the drivers of the different constituents. Because various electric potential differences can be used in this traditional irreversible thermodynamics approach, the advantages of the formulation of the transport equations in terms of concentration difference and electric current are emphasized.

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Diffusion dialysis Transport phenomena by irreversible thermodynamics

Narȩbska

Warszawski

1994

Journal of Membrane Science

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Electrolyte and Water Osmotic Flow Coefficients in Nafion Membranes

Cited by 4 publications

References 17 publications

Observable Streaming Potential in Membranes

Observable Streaming Potential in Membranes

Observable Quantities for Electrodiffusion Processes in Membranes

Diffusion dialysis Transport phenomena by irreversible thermodynamics

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