The similarity of electric double-layer interaction from the general Poisson–Boltzmann theory

We studied electric double-layer (EDL) interactions in electrolytes with different valence combinations. Our results show that the interactions are similar for electrolytes with the same co-ion valences and concentrations and such similarity increases with the co-ion valence and surface potential. A...

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Bibliographic Details
Published in:Journal of colloid and interface science 2006-08, Vol.300 (1), p.391-395
Main Authors: Zhang, Junfeng, Drechsler, Astrid, Grundke, Karina, Kwok, Daniel Y.
Format: Article
Language:English
Subjects:
Asymmetric electrolyte
Colloids - chemistry
Electric double layer
Interaction force
Models, Theoretical
Poisson–Boltzmann equation
Solutions - chemistry
Static Electricity
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Summary:We studied electric double-layer (EDL) interactions in electrolytes with different valence combinations. Our results show that the interactions are similar for electrolytes with the same co-ion valences and concentrations and such similarity increases with the co-ion valence and surface potential. A scaled surface potential was defined and found to be useful in characterizing the difference in EDL interaction. These results show that co-ions play a more important role than counterions in determining EDL potential and interaction in an electrolyte solution, especially for systems with high co-ion valence and/or high surface potentials.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2006.03.019