Study of Adsorption and Ion-Exchange Properties of Some Porous Membranes.

Kontturi, Kyösti; Savonen, Aki; Vuoristo, Mikko; Volden, Hans V.; Wang, Dong-Ni; Paulsen, Gudrun B.; Nielsen, Ruby I.; Olsen, Carl Erik; Pedersen, Christian; Stidsen, Carsten E.

doi:10.3891/acta.chem.scand.48-0001

Cited by 23 publications

(13 citation statements)

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“…Rather surprisingly, the streaming potential [not the streaming current, (van der Heyden et al 2005)] has not widely employed in the characterization of nanopores in spite of its relative experimental simplicity and considerable use in the case of porous membranes (Kontturi et al 1994;Huisman et al 2000;Cervera et al 2001b;Fievet et al 2001).…”

Section: Streaming Potentialmentioning

confidence: 99%

Incorporating ionic size in the transport equations for charged nanopores

Cervera

Ramı́rez

Manzanares

et al. 2009

Microfluid Nanofluid

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Nanopores with fixed charges show ionic selectivity because of the high surface potential and the small pore radius. In this limit, the size of the ions could no longer be ignored because they occupy a significant fraction of the pore and, in addition, they would reach unrealistic concentrations at the surface if treated as point charges. However, most models of selectivity assume point ions and ignore this fact. Although this approach shows the essential qualitative trends of the problem, it is not strictly valid for high surface potentials and low nanopore radii, which is just the case where a high ionic selectivity should be expected. We consider the effect of ion size on the electrical double layer within a charged cylindrical nanopore using an extended Poisson-Boltzmann equation, paying special attention to (non-equilibrium) transport properties such as the streaming potential, the counter-ion transport number, and the electrical conductance. The first two quantities are related to the nanopore selectivity while the third one characterizes the conductive properties. We discuss the nanopore characteristics in terms of the ratio between the electrolyte and fixed charge concentrations and the ratio between the ionic and nanopore radii showing the experimental range where the point ion model can still be useful. Even for relatively small inorganic ions at intermediate concentrations, ion size effects could be significant for a quantitative estimation of the nanopore selectivity in the case of high surface charge densities.

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Section: Streaming Potentialmentioning

confidence: 99%

Incorporating ionic size in the transport equations for charged nanopores

Cervera

Ramı́rez

Manzanares

et al. 2009

Microfluid Nanofluid

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show abstract

“…40 nm, and the charge concentration varied between 0.3 and 3 mM. Using a synthetic microfiltration membrane, the effect of adsorption on streaming potential has been demonstrated 8. Addition of a positively charged protein, cytochrome c , into the bathing solution changed the value of streaming potential from negative to positive as the protein was adsorbed on the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Drug Adsorption in Human Skin: A Streaming Potential Study

Raiman

Hänninen

Kontturi³

et al. 2003

Journal of Pharmaceutical Sciences

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“…Many studies on the diffusion of ions and molecules through ion exchange membranes have been reported (7)(8)(9)(10)(11)(12)(13). The permselectivity of these membranes is a consequence of co-ion exlusion, which is conventionally described by the classical Donnan equilibrium equations (14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%