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Abstract
In charged systems, the counterion distribution is an important information to understand their equilibrium structure. Small angle neutron scattering used with a contrast variation method is a suitable technique to analyze this distribution in aqueous and confined media. We had applied this method to Nafion membranes, a complex ionomer and disordered charged system. In this paper, the same approach is used for a lyotropic liquid crystal (LC) system: a lamellar phase of perfluoropolyether surfactants. As for Nafion system, we show strong counterion condensation at the surfactant–water interface that depends on the long-range period characterizing such an LC system.
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