Regensburg 2002 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 11: Dünne Filme, Monolagen und Oberfl
ächen

CPP 11.3: Talk

Wednesday, March 13, 2002, 14:10–14:30, H38

Ion distribution at a charged interface — •Hubert Motschmann, Randolf Teppner, Jonas Örtegren, Valentina Fazio, and Dieter Wantke — Max-Planck-Institut für Kolloid und Grenzflächenforschung, Am Mühlenberg 14476 Golm

The distribution of ions close to a charged wall is a classical problem in colloidal physics. The traditional approach consists in a mean field analysis of the counterion distribution leading to the Poisson Boltzmann theory. Recently this field has attracted renewed attention with several theoretical papers addressing effects beyond the mean field approach such as fluctuations or the discreteness of charges. These paper reveal certain new features which are not predicted in the mean filed picture. We address this problem experimentally and measure by a combination of linear and nonlinear optical techniques the prevailing ion distribution of a charged soluble surfactant at the air-water interface. Our data suggest an ion condensation just before the critical micelle concentration