Poisson-Boltzmann description of the electrical double layer including ion size effects.
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).
Departamento de Física, Universidad de Jaén, Campus Las Lagunillas, Ed. A-3, 23071 Jaén, Spain.
José Juan
JJ
López-García
José
J
Horno
Constantino
C
Grosse
D003198:Computer Simulation; D004573:Electrolytes / Q000737:chemistry; D004583:Electrons; D007477:Ions / Q000737:chemistry; D008567:Membranes, Artificial; D008956:Models, Chemical; D010316:Particle Size; D016012:Poisson Distribution; D012996:Solutions; D014867:Water / Q000737:chemistry
D004573:Electrolytes; D007477:Ions; D008567:Membranes, Artificial; D012996:Solutions; D014867:Water