Concentration profiles of a colloidal mixture near a charged wall
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The structure of a model two-component colloidal mixture in the vicinity of a charged wall is studied in the framework of the Derjaguin-Landau-Verweg- Overbeek potential and the hypernetted-chain approximation for the particle-particle and wall-particle direct correlation functions as the closure for the bulk and wall-particle Ornstein-Zernike equations. It is found that for strongly repulsive walls the structure of the inhomogeneous mixture near the wall only depends on the bulk parameters. For neutral and attractive walls, a monolayer of colloidal particles adjacent to the wall is formed. Depending on the charge asymmetry between the two colloidal species, the composition of this monolayer indicates a preferential electrostatic adsorption of the more highly charged species. For large charge asymmetry between the two species, a distinct segregation effect is predicted. © 1991 American Institute of Physics.
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Integral equations; Monolayers; Charge asymmetries; Concentration profiles; Direct correlation functions; Electrostatic adsorption; Hypernetted chain approximations; Inhomogeneous mixtures; Ornstein-Zernike equations; Segregation effects; Mixtures
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