Disjoining pressure of discrete surface charges on thin aqueous films |
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Authors: | Foret Lionel Kühn Reimer Würger Alois |
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Affiliation: | CPMOH, Université Bordeaux 1, 351 cours de la Libération, 33405 Talence, France. |
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Abstract: | The disjoining pressure of charged parallel interfaces confining an electrolyte solution is to a large extent determined by the screening clouds of the surface charges. We evaluate the pressure in terms of the number density sigma of discrete charges and film thickness d and find, at sigmad(2) approximately 1, a crossover from the well-known law P approximately sigma(2) to a linear behavior P approximately sigma. For the latter case, each surface charge results in strongly inhomogeneous pressure profiles at both interfaces. |
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