The effect of the finite size of ions and Debye layer overspill on the screened Coulomb interactions between charged flat plates.
EDL overspill
Modified Poisson-Boltzmann equation
Repulsion pressure
Steric effect of ions
Journal
Electrophoresis
ISSN: 1522-2683
Titre abrégé: Electrophoresis
Pays: Germany
ID NLM: 8204476
Informations de publication
Date de publication:
04 2020
04 2020
Historique:
received:
27
08
2019
revised:
21
11
2019
accepted:
14
12
2019
pubmed:
20
12
2019
medline:
16
3
2021
entrez:
20
12
2019
Statut:
ppublish
Résumé
Screened repulsion between uniformly charged plates with an intervening electrolyte is analyzed for strongly overlapped electrical double layers (EDL), accounting for the steric effect of ions and their expulsion from EDL edges into the surrounding solution. As a generalization of a study by Philipse et al. which does not account for these effects, an analytical expression is derived for the repulsion pressure in the limit of infinitely long plates with a zero-field assumption, which agrees closely with the corresponding numerical solution at low inter-plate separations. Our results show an augmented repulsive pressure for finite-sized ions at strong EDL overlaps. For plates with a finite lateral size, we demonstrate a further extended domain of low inter-plate gaps where the repulsion pressure increases with ion size due to a strong interplay between the steric interaction of ions and the EDL overspill phenomenon, considered earlier in a study by Ghosal & Sherwood limited to the linear Debye-Hückel regime (which cannot account for the steric effect of ions). This investigation on a simple model should enhance our understanding of the interaction between charged particles in electrophoresis, nanoscale self-assembly, active particles, and various other electrokinetic systems.
Identifiants
pubmed: 31855289
doi: 10.1002/elps.201900318
doi:
Substances chimiques
Electrolytes
0
Ions
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
607-614Subventions
Organisme : Science and Engineering Research Board
Pays : International
Informations de copyright
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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