Related Experiment Video
Updated: Jun 9, 2026
08:06
Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
Concentration polarization of interface and non-linear electrokinetic phenomena
1Institute of Colloid Chemistry and Water Chemistry of National Academy of Sciences of Ukraine, pr. Vernadskogo, 42, Kiev-142, Ukraine, 03680. nat_mis@ukr.net
Advances in Colloid and Interface Science
|September 3, 2010
Summary
Concentration polarization significantly impacts electrokinetic phenomena and mass transfer. This review analyzes its effects on conducting and nonconducting materials, detailing theoretical models and experimental findings.
Area of Science:
- Physical Chemistry
- Colloid Science
- Electrochemistry
Background:
- Concentration polarization is a critical phenomenon in electrokinetic processes.
- Understanding its impact on charged materials is essential for various applications.
Purpose of the Study:
- To review the fundamental aspects of concentration polarization.
- To analyze its influence on electroosmosis, electrophoresis, and mass transfer.
- To discuss theoretical models and experimental validation for both conducting and nonconducting materials.
Main Methods:
- Theoretical analysis of concentration polarization mechanisms.
- Review of experimental investigations on polarization effects.
- Analysis of mathematical models for electrokinetic phenomena.
Main Results:
- Concentration polarization leads to non-linear electrokinetic behavior.
- Induced space charge formation is key to understanding polarization effects.
- Heterogeneous conductivity significantly influences polarization in membranes.
Conclusions:
- Concentration polarization is a crucial factor affecting electrokinetic phenomena and mass transport.
- Accurate theoretical models and experimental data are vital for practical applications.
- Further research on nonconducting particles and surface electroconductivity is warranted.
Related Concept Videos
01:06Interfacial Electrochemical Methods: Overview
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:23Theory of Strong Electrolytes
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:30Processes at Electrodes
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
01:31Dielectric Polarization in a Capacitor
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...