Surface transport processes in charged porous media
Abstract
Surface transport processes are important in chemistry, colloidal sciences, engineering, biology, and geophysics. Natural or externally produced charges on surfaces create electrical double layers (EDLs) at the solid-liquid interface. The existence of the EDLs produces several complex processes including bulk and surface transport of ions. In this work, a model is presented to simulate bulk and transport processes in homogeneous porous media comprising big pores. It is based on a theory for capacitive charging by ideally polarizable porous electrodes without Faradaic reactions or specific adsorption of ions. A volume averaging technique is used to derive the averaged transport equations in the limit of thin electrical double layers. Description of the EDL between the electrolyte solution and the charged wall is accomplished using the Gouy-Chapman-Stern (GCS) model. The surface transport terms enter into the average equations due to the use of boundary conditions for diffuse interfaces. Two extra surface transports terms appear in the closed average equations. One is a surface diffusion term equivalent to the transport process in non-charged porous media. The second surface transport term is a migration term unique to charged porous media. The effective bulk and transport parameters for isotropic porous media are calculated solving the correspondingmore »
- Authors:
-
- Prairie View A&M Univ., Prairie View, TX (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1361353
- Alternate Identifier(s):
- OSTI ID: 1415308
- Grant/Contract Number:
- AC05-00OR22725; AC05-0096OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Colloid and Interface Science
- Additional Journal Information:
- Journal Volume: 498; Journal Issue: C; Journal ID: ISSN 0021-9797
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Gabitto, Jorge, and Tsouris, Costas. Surface transport processes in charged porous media. United States: N. p., 2017.
Web. doi:10.1016/j.jcis.2017.03.009.
Gabitto, Jorge, & Tsouris, Costas. Surface transport processes in charged porous media. United States. https://doi.org/10.1016/j.jcis.2017.03.009
Gabitto, Jorge, and Tsouris, Costas. Fri .
"Surface transport processes in charged porous media". United States. https://doi.org/10.1016/j.jcis.2017.03.009. https://www.osti.gov/servlets/purl/1361353.
@article{osti_1361353,
title = {Surface transport processes in charged porous media},
author = {Gabitto, Jorge and Tsouris, Costas},
abstractNote = {Surface transport processes are important in chemistry, colloidal sciences, engineering, biology, and geophysics. Natural or externally produced charges on surfaces create electrical double layers (EDLs) at the solid-liquid interface. The existence of the EDLs produces several complex processes including bulk and surface transport of ions. In this work, a model is presented to simulate bulk and transport processes in homogeneous porous media comprising big pores. It is based on a theory for capacitive charging by ideally polarizable porous electrodes without Faradaic reactions or specific adsorption of ions. A volume averaging technique is used to derive the averaged transport equations in the limit of thin electrical double layers. Description of the EDL between the electrolyte solution and the charged wall is accomplished using the Gouy-Chapman-Stern (GCS) model. The surface transport terms enter into the average equations due to the use of boundary conditions for diffuse interfaces. Two extra surface transports terms appear in the closed average equations. One is a surface diffusion term equivalent to the transport process in non-charged porous media. The second surface transport term is a migration term unique to charged porous media. The effective bulk and transport parameters for isotropic porous media are calculated solving the corresponding closure problems.},
doi = {10.1016/j.jcis.2017.03.009},
journal = {Journal of Colloid and Interface Science},
number = C,
volume = 498,
place = {United States},
year = {Fri Mar 03 00:00:00 EST 2017},
month = {Fri Mar 03 00:00:00 EST 2017}
}
Web of Science
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