Potential Measurements for Selectivity Determinations of Polycarbonate Membranes Bounded by LiCl Solutions

Ochoa-Martínez, Luz Araceli; Martínez, Fernando; Arribas, Juan Ignacio; Tejerina, A. F.

doi:10.1515/jnet.1987.12.2.147

Cited by 3 publications

(5 citation statements)

References 11 publications

(9 reference statements)

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“…A previous study [3] on the ionic selectivity has shown that for the Ν 5 membrane D p = D d at every temperature and concentration studied. So in order to calculate δ from Eq.…”

Section: Thickness Of Diffusion Layersmentioning

confidence: 78%

“…a) The ionic selectivities of these membranes have been studied for the same temperatures and concentrations [3]. From that we obtained that these quantities approach zero for membranes with great pore diameters and for high concentrations, which means that pore diffusion approaches free diffusion (D p ^ D d ).…”

Section: Salt Permeabilitymentioning

confidence: 90%

“…The measurement cell used during all the experiments coincides with that previously used for the potential measurement [3] . A schematic overview of the whole set-up is shown in Fig.…”

Section: Experimental Set-upmentioning

confidence: 99%

See 2 more Smart Citations

Diffusion of LiCl Through Nuclepore Membranes of Polycarbonate

Ochoa-Martínez¹,

Tejerina²,

Arribas³

1987

Journal of Non-Equilibrium Thermodynamics

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Diffusion of LiCl through six different types of Nuclepore membranes of polycarbonate has been studied. The concentration change with time in the dilute solution bathing the membrane, due to the diffusion process, was continuously monitored by means of a conductimeter on line with a microcomputer. Measurements have been performed at different concentrations in the range 2.10~4 -10" 1 mol -dm"" 3 , and at different temperatures between 20°C and 50°C. The salt permeability P ms , of the membrane system, formed by the membrane itself and the two adjacent diffusion layers, is calculated from the concentration vs. time curve. In this paper we study the variation of P ms with the concentration of the solutions, some characteristics of the membranes and with temperature. On the other hand, due to the fact that the salt flux can be considered as a quasisteady flux, it has been possible to estimate the concentration profile throughout the membrane system.

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“…A previous study [3] on the ionic selectivity has shown that for the Ν 5 membrane D p = D d at every temperature and concentration studied. So in order to calculate δ from Eq.…”

Section: Thickness Of Diffusion Layersmentioning

confidence: 78%

Section: Salt Permeabilitymentioning

confidence: 90%

See 1 more Smart Citation

Diffusion of LiCl Through Nuclepore Membranes of Polycarbonate

Ochoa-Martínez¹,

Tejerina²,

Arribas³

1987

Journal of Non-Equilibrium Thermodynamics

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“…The potential arising across the membrane system was studied by constructing a cell of the type: emf, Ec, of this cell was measured by using the two-compartment cell shown in a previous paper (2). This method allowed keeping the concentrations Nl and N2 constant because both solutions have agitation and renovation systems available.…”

Section: Methodsmentioning

confidence: 99%

Cation Transport Numbers in Polycarbonate Microporous Membranes. Effect of Unstirred Diffusion Layers

Ochoa-Martínez

Hernández

Tejerina

1987

Separation Science and Technology

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In this paper we obtain the apparent transport numbers across different polycarbonate microporous membranes bathed by two isothermal aqueous solutions of the same electrolyte but at different concentrations, N1 and N2. The effect of unstirred layers adjacent to the membrane is taken into account. Six different membranes and two etectrolytes (LiC1 and MgC12) were studied at 20,30, 40, and 50°C and for N , and N2 in the range lo-' to 2 X equivb.

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“…and ionic selectivity [3] etc. The Nuclepore membranes, made of polycarbonate, were commonly used in these researches.…”

Section: Introductionmentioning

confidence: 99%

Short Communication

1996

Journal of Non-Equilibrium Thermodynamics

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The diffusion of ions through alumina membranes was studied. The alumina membranes used have cylindrical pores, similar to the Nuclepore membranes, but with higher porosity (0.2 and 0.5). The ion diffusion rates and the membrane system potentials were measured. From these values, the concentration profiles of the electrolyte solution in the mebrane and in the two diffusion layers were deduced. The concentration profiles showed that the contribution of the membrane to the diffusion process was larger (smaller) for the lower (higher) porosity membrane.

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Potential Measurements for Selectivity Determinations of Polycarbonate Membranes Bounded by LiCl Solutions

Cited by 3 publications

References 11 publications

Diffusion of LiCl Through Nuclepore Membranes of Polycarbonate

Diffusion of LiCl Through Nuclepore Membranes of Polycarbonate

Cation Transport Numbers in Polycarbonate Microporous Membranes. Effect of Unstirred Diffusion Layers

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