Space charge effect on competitive ion transport through ion-exchange membranes

Zabolotsky, V. I.; Manzanares, José A.; Nikonenko, Victor; Лебедев, К. А.; Lovtsov, E. G.

doi:10.1016/s0011-9164(02)00614-8

Cited by 75 publications

(55 citation statements)

References 5 publications

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“…13 for single positively charged analytes with a similar molecular weight. It is governed by the analyte's effective transport number during the inherently competitive charge transport with other analytes and background electrolyte or buffer through the charge-selective particles and adjacent CP zones [179].…”

Section: Discussionmentioning

confidence: 99%

Ionic conductance of nanopores in microscale analysis systems: Where microfluidics meets nanofluidics

Höltzel

Tallarek²

2007

J of Separation Science

143

153

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In this tutorial review we illustrate the origin and dependence on various system parameters of the ionic conductance that exists in discrete nanochannels as well as in nanoporous separation and preconcentration units contained as hybrid configurations, membranes, packed beds, or monoliths in microscale liquid phase analysis systems. A particular complexity arises as external electrical fields are superimposed on internal chemical and electrical potential gradients for tailoring molecular transport. It is demonstrated that the variety of geometries in which the microfluidic/nanofluidic interfaces are realized share common, fundamental features of coupled mass and charge transport, but that phenomena behind the key steps in a particular application can be significantly tuned, depending on the morphology of a material. Thus, the understanding of morphology-related transport in internal and external electrical potential gradients is critical to the performance of a device. This addresses a variety of geometries (slits, channels, filters, membranes, random or regular networks of pores, etc.) and applications, e. g., the gating, sensing, preconcentration, and separation in multifunctional miniaturized devices. Inherently coupled mass and charge transport through ion-permselective (charge-selective) microfluidic/nanofluidic interfaces is analyzed with a stepwise-added complexity and discussed with respect to the morphology of the charge-selective spatial domains. Within this scenario, the electrostatics and electrokinetics in microfluidic and nanofluidic channels, as well as the electrohydrodynamics evolving at microfluidic/nanofluidic interfaces, where microfluidics meets nanofluidics, define the platform of central phenomena.

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Section: Discussionmentioning

confidence: 99%

Ionic conductance of nanopores in microscale analysis systems: Where microfluidics meets nanofluidics

Höltzel

Tallarek²

2007

J of Separation Science

143

153

View full text Add to dashboard Cite

show abstract

“…In dilute solution, the solution is ideal and the ion activity is equal to the corresponding concentration [16,25].…”

Section: Equations Of the Modelmentioning

confidence: 99%

“…A great number of works are devoted to theoretical studies of transfer processes through ion exchange membranes based on the NernstPlanck equation [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. On the other hand, some modeling is based on solving a steady-state convective diffusion equation for the laminar flow regime [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mass transfer modeling of desalination through an electrodialysis cell

et al. 2015

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“…where T k is the effective transport number [36,46,47] characterizing the membrane permselectivity under given conditions. We will assume that T k does not vary with current density applied; in all calculations in this paper its value is taken as 1 for the counterion and 0 for the co-ion that is justified by relatively low concentration of the solution used in experiments (0.02 M NaCl).…”

Section: General Governing Equationsmentioning

confidence: 99%