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- W2950957039 abstract "The behavior of electrolyte solutions close to a charged surface is studied theoretically. A modified Poisson-Boltzmann equation which takes into account the volume excluded by the ions in addition to the electrostatic interactions is presented. In a formal lattice gas formalism the modified Poisson-Boltzmann equation can be obtained from a mean-field approximation of the partition function. In an alternative phenomenological approach, the same equation can be derived by including the entropy of the solvent molecules in the free energy. In order to visualize the effect of the steric repulsion, a simple case of a single, highly charged, flat surface is discussed. This situation resembles recent adsorption experiments of large ions onto a charged monolayer. A simple criterion for the importance of the steric effects is expressed in terms of the surface charge density and the size of the ions. It is shown that when these effects are important a saturated layer is formed near the surface. A modified Grahame equation relating the ion concentration at the surface to the surface charge density is obtained." @default.
- W2950957039 created "2019-06-27" @default.
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- W2950957039 date "1999-11-30" @default.
- W2950957039 modified "2023-09-24" @default.
- W2950957039 title "Adsorption of Large Ions from an Electrolyte Solution: A Modified Poisson-Boltzmann Equation" @default.
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- W2950957039 hasPublicationYear "1999" @default.
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