Abstract
The equilibrium thicknesses of black foam films and the interlayer spacings of the structurally similar lamellar mesomophic phase (neat phase) formed by the decyltrimethylammonium decylsulphate + NaBr + H 2O system have been measured at 298 K. A marked variation of film thickness and also neat-phase spacing occurs with changing system composition. This is attributed in both cases to the effect of inorganic ions on electrostatic interactions between surfactant layers, although the exact mechanism differs for each case.
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