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Chemico-electromechanical coupling in microporous media.
1CNRS-CEREGE, Université Paul Cézanne, Département d'Hydrogéophysique et Milieux Poreux, BP 80, 13545 Aix-en-Provence, Cedex 4, France. revil@cerege.fr
Journal of Colloid and Interface Science
|August 8, 2006
Summary
This study models transport properties in microporous media using Nernst-Planck and Navier-Stokes equations. Macroscopic transport properties are linked to permeability and electrical formation factor, crucial for understanding fluid and ion movement.
Area of Science:
- Physical Chemistry
- Materials Science
- Geophysics
Background:
- Microporous media exhibit complex charge partitioning between Gouy-Chapman and Stern layers.
- Understanding macroscopic transport requires bridging microscale ionic distributions with macroscale properties.
Purpose of the Study:
- To determine macroscopic transport properties of isotropic microporous media under nonisothermal conditions.
- To derive macroscopic constitutive transport equations from fundamental physical principles.
Main Methods:
- Volume-averaging local Nernst-Planck and Navier-Stokes equations.
- Utilizing Donnan distributions instead of Poisson-Boltzmann for ionic concentrations.
- Deriving macroscopic Maxwell and constitutive transport equations near equilibrium.
Main Results:
- Macroscopic transport properties are determined by volume-averaging.
- Onsager reciprocity governs cross-coupling phenomena near thermodynamic equilibrium.
- Material properties depend solely on permeability and electrical formation factor.
Conclusions:
- The study provides a framework for understanding transport in deformable microporous materials.
- Permeability and electrical formation factor are key textural properties governing macroscopic transport.
- The derived equations are valid in the vicinity of thermodynamic equilibrium and nonisothermal conditions.