Abstract
The case of a film containing k strong 1:1 electrolytes sandwiched between nonpolar phases is considered at low electric surface potentials. An analytical equation for the electrostatic disjoining pressure under adsorptive charge regulation is obtained. It gives the well-known limiting cases of constant surface charge or potential depending on the value of a dimensionless parameter Φ. The calculated balance between van der Waals' attraction and electrostatic repulsion is in agreement with experimental evidence for the dependence on electrolyte concentration of the transition between common black and Newton water foam films stabilized with nonionic surfactants.
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