Measurement of Ion and Water Transport across Membranes

McKelvey, J. G.; Spiegler, K. S.; Wyllie, M. R. J.

doi:10.1149/1.2428587

Cited by 13 publications

(4 citation statements)

References 8 publications

(25 reference statements)

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“…In this case, the nonexchange electrolyte carries a part of the current. Consequently, the number of moles of water transported per faraday under these conditions should depend to some Several recent papers are concerned with the electroosmotic transport of water across ionic membranes (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), prompted in part by the technical use of such membranes for saline water conversion. Some of the data were obtained under conditions in which the membranes were not exclusively permeable to ions of one sign only and therefore cannot readily be compared with our observations on permselective membranes.…”

mentioning

confidence: 99%

Electroosmosis in Cation-Selective Collodion Matrix Membranes of Graded Porosity

Carr¹,

McClintock²,

Söllner³

1962

J. Electrochem. Soc.

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Electroosmosis was studied in a series of highly charged cation-selective collodion matrix membranes varying in porosity from fairly dense permselective membranes (9% water content) to highly porous membranes (75% water content). In all membranes the amount of water transported per faraday was independent of the current density in the tested range, 0.05-0.80 ma/cm ~. There was a parallelism between the water content of the membrane and the moles of water transported per faraday. In the presence of KC1 the moles of water transported per faraday varied from 3 to 50 for the series of membranes tested, and with LiC1 from 6 to 90. With all membranes the values with LiC1 were about twice those obtained with KC1. This is in conformity with current theories of the transport process, according to which the water transport is higher the greater the friction between water and the permeating ions. Accordingly, the lower mobility of the lithium ion in the membrane (and in aqueous solution) is associated with a higher transport per faraday across the membrane. Exclusively anion permeable membranes gave analogous results.

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confidence: 99%

Electroosmosis in Cation-Selective Collodion Matrix Membranes of Graded Porosity

Carr¹,

McClintock²,

Söllner³

1962

J. Electrochem. Soc.

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“…To measure of the electrolyte transfer was used samples cut from bituminous coal from the Zadubrovsky deposit containing layers of coal located parallel to each other. A thin layer sample of coal from the Zadubrovsky deposit (thickness l = 0.008 m, diameter d = 0.02 m) was placed as a membrane into the McKelvey, Spiegler, and Willy cell [14]. The right part of the cell was filled with distilled water (V = 400 ml, pH = 6.0  6.5), the left was filled with 0.05 M solution of sulfuric acid (V = 400 ml, pH = 1.25).…”

Section: Electrolyte Transfer Measurementsmentioning

confidence: 99%

NMR study of the electrolyte diffusion in bituminous coal

Altshuler,

Malyshenko,

Lyrshchikov

et al. 2023

E3S Web Conf.

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The transfer of the electrolyte molecules (H2SO4 or H3PO4) into bituminous coal was studied by the method of solid-state NMR spectroscopy. The kinetic dependences of the electrolytes transfer into a coal membrane from an aqueous solution have been obtained. It was shown that the transfer of H2SO4 molecules into a coal thin layer is determined by the solid phase diffusion. The process was investigated in the framework of a mathematical model of diffusion in layered media. When the flow of electrolyte is directed perpendicular to the surface of the layer the diffusion coefficient of sulfuric acid in the coal equals 1∙10-13 m2/s. The diffusion coefficient of H2SO4 in the bituminous coal is four order of less than the self-diffusion coefficient of proton in aqueous solution. The diffusion process of the electrolyte delivery may be the rate-limiting stage preceding chemical transformations with the H2SO4 participation in bituminous coal.

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“…It is important that none of these measurements involve the application of pressure, and that they can all be carried out in the absence of a concentration gradient across the membrane. 13 The explicit calculation of the friction coefficients is performed in the appendix. This method of computing the transport coefficients is possible only if the frictional interaction between Naf and C1-is negligible and if D1, D2, G, k and tf have been measured with sufficient accuracy (better than 1 %).…”

Section: We Obtainmentioning

confidence: 99%

Transport processes in ionic membranes

Spiegler¹

1958

Trans. Faraday Soc.

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389

152

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A simple molecular model representing a solid ionic medium in equilibrium with a salt solution is described. Solid ionic media are permeable ion-exchanging bodies, e.g. ion-exchange columns, soil aggregates, certain shales, and ion-exchange membranes. The theory is particularly adapted to the latter.The transport processes caused by pressure, electrical and osmotic forces are described in terms of the volume concentrations of ions, water, and solid, and certain " friction coefficients " between these components. This analysis suggests approximations which reduce the number of the experiments needed for describing the transport processes. Application of the theory leads to relations of transport phenomena in a series of membranes of similar chemical nature, but different capacity and water content. This is illustrated by two sets of numerical examples where the theory is applied to data of other authors for cross-linked polyniethacrylate and sulphonated polystyrene membranes respectively.The model leads to flux equations which are consistent with the postulates of steadystate thermodynamics. In addition to the known laws of electrokinetics, permeability and electrical conductance, the theory also leads to a number of hitherto untested relationships.* This example has been chosen in order to avoid the complications caused by the presence of water. At 500°C sodium fluoride is a pure cationic conductor.10

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Measurement of Ion and Water Transport across Membranes

Abstract: Electrical migration of ions and solvent (electro-) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.211.4.224 Downloaded on 2015-06-20 to IP

Cited by 13 publications

References 8 publications

Electroosmosis in Cation-Selective Collodion Matrix Membranes of Graded Porosity

Electroosmosis in Cation-Selective Collodion Matrix Membranes of Graded Porosity

NMR study of the electrolyte diffusion in bituminous coal

Transport processes in ionic membranes

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