Journal
LANGMUIR
Volume 27, Issue 23, Pages 13970-13974Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la2025445
Keywords
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Funding
- MICINN [FIS2010-19493]
- Junta de Andalucia of Spain [PE-2008 FQM-3993]
- EU
- CIUNT of Argentina [26/E419]
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The electrical double layer is examined using a generalized Poisson-Boltzmann equation that takes into account the finite ion size by modeling the aqueous electrolyte solution as a suspension of polarizable insulating spheres in water. We find that this model greatly amplifies the steric effects predicted by the usual modified Poisson-Boltzmann equation, which imposes only a restriction on the ability of ions to approach one another. This amplification should allow for an interpretation of the experimental results using reasonable effective ionic radii (close to their well-known hydrated values).
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