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Published on: July 18, 2014
Disjoining pressure of discrete surface charges on thin aqueous films
Lionel Foret1, Reimer Kühn, Alois Würger
1CPMOH, Université Bordeaux 1, 351 cours de la Libération, 33405 Talence, France.
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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