Current–Induced Ion Concentration Polarization at a Perfect Ion–Exchange Patch in an Infinite Insulating Wall
- National Academy of Sciences of Ukraine, Kyiv (Ukraine); University of Notre Dame
- Univ. of Notre Dame, IN (United States)
- ICREA, Barcelona (Spain); Polytechnic Univ. of Catalonia, Barcelona (Spain)
This research examines theoretically the ion concentration polarization, ion fluxes, and electrostatic fields near an ion exchange patch in the wall of an electrified fluidic channel. These phenomena are important in related microfluidic ion-preconcentration systems. Under an electric field, counterions enter the ion-exchange patch at one side and leave at the other, with salt depletion occurring near the entrance and accumulation near the exit. Furthermore, the high patch conductivity and the concentration profiles lead to local electric field perturbations that may facilitate preconcentration. This study includes analytical expressions of ion concentrations and electrochemical potentials at small to moderate electric fields, as well as numerical simulations. Additionally, a simple matrix of polynomial coefficients (obtained via fitting of numerical data) enables analytical calculation of the 2-dimensional concentration profiles at all electric fields within the range investigated in the numerical simulations. This is possible because a single dimensionless parameter controls this problem.
- Research Organization:
- Univ. of Notre Dame, IN (United States)
- Sponsoring Organization:
- Spanish Ministry of Economy and Competitiveness; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- SC0017618
- OSTI ID:
- 1785977
- Journal Information:
- ChemElectroChem, Journal Name: ChemElectroChem Journal Issue: 6 Vol. 7; ISSN 2196-0216
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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