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Electrokinetics at liquid-liquid interfaces: Physical models and transport mechanisms
1Department of Engineering Mechanics and Laboratory of APS, Tsinghua University, Beijing 100084, China.
Advances in Colloid and Interface Science
|April 25, 2025
Summary
Electrokinetic multiphase hydrodynamics (EKmHD) explores unique liquid-liquid interface phenomena. This review integrates charging mechanisms and flow behaviors, advancing EKmHD as a foundational interdisciplinary field.
Area of Science:
- Focuses on electrochemistry, colloid and interface science, and physicochemical hydrodynamics.
- Investigates electrokinetic phenomena at immiscible liquid-liquid interfaces.
Background:
- Liquid-liquid interfaces possess unique diffuse soft properties (thickness, fluidity, permeability) unlike solid-liquid interfaces.
- These properties lead to diverse interfacial charging mechanisms and conductive dielectric characteristics.
- Electrokinetic multiphase hydrodynamics (EKmHD) is experiencing a resurgence of interest.
Purpose of the Study:
- To highlight the need for integrated research combining interfacial charging and electrokinetic flows.
- To establish a cross-scale modeling framework for interfacial multiphysical transport.
- To systematically organize characteristics of liquid-liquid interfaces regarding charging and electrokinetic behaviors.
Main Methods:
- Systematic organization of liquid-liquid interface characteristics from charging and electrokinetic perspectives.
- Emphasis on spontaneous partition- and adsorption-induced charging.
- Comprehensive summary of transport mechanisms in electrokinetic multiphase flows.
Main Results:
- Identifies strong coupling between multiphase diffuse soft interface flow and ion transport.
- Refines dominant dimensionless parameters for electrokinetic multiphase flows.
- Consolidates understanding of typical electrokinetic multiphase flow scenarios.
Conclusions:
- EKmHD, with its unique interfacial properties, is positioned as a foundational interdisciplinary field.
- Proposes future research directions including double-sided coupling effects, droplet/bubble electrophoresis, and electrokinetic instabilities.
- Emphasizes the need for active and passive control of two-phase electrokinetic wetting dynamics.
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