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Analytic model for the electrowetting properties of oil-water-solid systems
A Cavalli1, B Bera1, D van den Ende1
1Physics of Complex Fluids, MESA+Institute of Technology, University of Twente, PO Box 217, 7500AE, The Netherlands.
Physical Review. E
|May 14, 2016
Summary
Charge regulation significantly impacts oil-water wetting on charged surfaces. This study models wetting transitions, showing charge regulation broadens partial and complete wetting scenarios.
Area of Science:
- Surface Science
- Colloid and Interface Science
- Physical Chemistry
Background:
- Wetting phenomena are crucial in various applications, influenced by surface charge.
- Surface charge density is dynamic, affected by ion adsorption/desorption and thin aqueous films.
- Understanding these dynamics is key to predicting and controlling wetting behavior.
Purpose of the Study:
- To analyze the wettability of oil-aqueous electrolyte systems on solid surfaces.
- To investigate the role of charge regulation in wetting transitions.
- To develop a theoretical model for predicting wetting behavior based on surface properties.
Main Methods:
- Coupling Derjaguin-Landau-Verwey-Overbeek (DLVO) theory with a linearized charge regulation model.
- Linearizing electrostatic interactions for an analytic description.
- Implementing the model for mica-water-alkane systems.
Main Results:
- Charge regulation plays a significant role in determining wetting behavior.
- The model provides an analytic description of wetting transitions.
- Charge regulation expands the parameter space for partial and complete wetting.
- It reduces the occurrence of pseudopartial and metastable wetting configurations.
Conclusions:
- The developed model accurately describes wetting transitions influenced by charge regulation.
- Charge regulation is a critical factor in oil-water-solid interfacial phenomena.
- The findings offer insights into controlling wetting in systems like mica-water-alkane.
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