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Title: Convective diffusion in porous membranes with adsorbed charges

Abstract

We have studied experimentally the effects that the charge adsorbed on the membrane pore walls exerts on the convective diffusion through a porous membrane. The plot of the logarithm of the bulk concentration ratio vs convective flow through the membrane is usually employed to determine the membrane parameter A/L (effective membrane area/membrane thickness). It is shown that the deviations from the linear behavior of this plot give us information on the adsorbed charge concentration. A simple model based on the Nernst-Planck equation for the ion fluxes and the Navier-Stokes equation for the pore fluid velocity has proved to be useful for the understanding of the experimental trends observed over a range of membrane pore radius and electrolyte concentration. Our study can be seen as an independent confirmation of a rather general result: ion adsorption to the pore walls of inert, porous membranes can significantly affect the transport phenomena, especially in the limit of low electrolyte concentration. 17 refs., 3 figs., 3 tabs.

Authors:
; ; ;  [1]; ;  [2]
  1. (Helsinki Univ. of Technology, Espoo (Finland))
  2. (Univ. of Valencia, Burjasot (Spain))
Publication Date:
OSTI Identifier:
7166281
Resource Type:
Journal Article
Journal Name:
Langmuir; (United States)
Additional Journal Information:
Journal Volume: 10:3; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; MEMBRANES; ADSORPTION; DIFFUSION; COMPILED DATA; CONVECTION; ELECTROLYTES; GLASS; IONS; MEMBRANE PORES; MEMBRANE TRANSPORT; NAVIER-STOKES EQUATIONS; POROUS MATERIALS; POTASSIUM CHLORIDES; SODIUM CHLORIDES; ALKALI METAL COMPOUNDS; CHARGED PARTICLES; CHLORIDES; CHLORINE COMPOUNDS; DATA; DIFFERENTIAL EQUATIONS; ENERGY TRANSFER; EQUATIONS; HALIDES; HALOGEN COMPOUNDS; HEAT TRANSFER; INFORMATION; MASS TRANSFER; MATERIALS; NUMERICAL DATA; PARTIAL DIFFERENTIAL EQUATIONS; POTASSIUM COMPOUNDS; SODIUM COMPOUNDS; SORPTION; 400105* - Separation Procedures; 420400 - Engineering- Heat Transfer & Fluid Flow; 990200 - Mathematics & Computers

Citation Formats

Kontturi, A.K., Kontturi, K., Niinikoski, P., Vuoristo, M., Mafe, S., and Manzanares, J.A.. Convective diffusion in porous membranes with adsorbed charges. United States: N. p., 1994. Web. doi:10.1021/la00015a056.
Kontturi, A.K., Kontturi, K., Niinikoski, P., Vuoristo, M., Mafe, S., & Manzanares, J.A.. Convective diffusion in porous membranes with adsorbed charges. United States. doi:10.1021/la00015a056.
Kontturi, A.K., Kontturi, K., Niinikoski, P., Vuoristo, M., Mafe, S., and Manzanares, J.A.. Tue . "Convective diffusion in porous membranes with adsorbed charges". United States. doi:10.1021/la00015a056.
@article{osti_7166281,
title = {Convective diffusion in porous membranes with adsorbed charges},
author = {Kontturi, A.K. and Kontturi, K. and Niinikoski, P. and Vuoristo, M. and Mafe, S. and Manzanares, J.A.},
abstractNote = {We have studied experimentally the effects that the charge adsorbed on the membrane pore walls exerts on the convective diffusion through a porous membrane. The plot of the logarithm of the bulk concentration ratio vs convective flow through the membrane is usually employed to determine the membrane parameter A/L (effective membrane area/membrane thickness). It is shown that the deviations from the linear behavior of this plot give us information on the adsorbed charge concentration. A simple model based on the Nernst-Planck equation for the ion fluxes and the Navier-Stokes equation for the pore fluid velocity has proved to be useful for the understanding of the experimental trends observed over a range of membrane pore radius and electrolyte concentration. Our study can be seen as an independent confirmation of a rather general result: ion adsorption to the pore walls of inert, porous membranes can significantly affect the transport phenomena, especially in the limit of low electrolyte concentration. 17 refs., 3 figs., 3 tabs.},
doi = {10.1021/la00015a056},
journal = {Langmuir; (United States)},
issn = {0743-7463},
number = ,
volume = 10:3,
place = {United States},
year = {1994},
month = {3}
}