Abstract
We study the effect of electrostatic interactions in membranes by weakly charging swollen lamellar phases of several binary water-nonionic surfactant systems through the addition of ionic surfactants. For the water-C 12 E 5 system, preceding publications have presented evidence that undulations stabilize the lamellar phase with intermembrane spacings up to 300 nm. These undulations can be influenced by the addition of traces of ionic surfactants (1 ionic per 1000 nonionic molecules) leading to a substantial reduction of the spacings. The reduction can be understood as being caused by a flattening of the undulating membranes due to electrostatic repulsions of the ionic surfactant head groups
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