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Published on: October 29, 2018
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Reciprocal relations in electroacoustics
1Environmental Fluid Mechanics, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2600 GA Delft, The Netherlands.
The Journal of Chemical Physics
|August 3, 2014
Summary
Electrokinetic phenomena link sound waves and electric fields in colloidal suspensions. This study generalizes O'Brien's reciprocal relation between Electrophoretic Mobility and Colloid Vibration Current, confirming it as an Onsager relation.
Area of Science:
- Colloid science
- Physical chemistry
- Fluid dynamics
Background:
- Electrokinetic phenomena involve interactions between electric fields and fluid motion in colloidal systems.
- Key phenomena include Electrokinetic Sonic Amplitude (ESA), Electrophoretic Mobility (EM), and Colloid Vibration Potential/Current (CVP/CVI).
- A reciprocal relation between EM and CVI was previously derived by O'Brien.
Purpose of the Study:
- To generalize O'Brien's reciprocal relation for electrokinetic phenomena.
- To derive general relations for electrolyte solutions, applicable to colloidal suspensions.
- To discuss the interrelations between ESA, EM, CVP, and CVI.
Main Methods:
- Construction of entropy production to derive linear force-flux relations.
- General theoretical framework for electrolyte solutions.
- Analysis of reciprocal relations within the context of Onsager relations.
Main Results:
- General relations are derived for the proportionality coefficients of electrokinetic phenomena.
- O'Brien's reciprocal relation is confirmed as an Onsager relation.
- The derived relations are valid for various frequencies, surface charges, and particle concentrations in isotropic systems.
Conclusions:
- The study provides a generalized theoretical framework for understanding electrokinetic phenomena.
- Confirms the fundamental nature of reciprocal relations in these systems.
- Highlights the applicability of Onsager's theory to complex colloidal systems.
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