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CPP: Chemische Physik und Polymerphysik

CPP 14: Poster: Kolloidale Systeme

CPP 14.4: Poster

Mittwoch, 13. März 2002, 16:30–18:00, B

Accessing the Surface of Colloidal Particles by Ellipsometric Scattering — •Reinhard Sigel — Max Planck Institut für Kolloid- und Grenzflächenforschung, Golm

A special feature of colloidal materials is their large surface due to the fine dispersion of matter. Combining light scattering with polarization optics common to ellipsometry results in a new experimental technique capable to access this characteristic surface. Like in classical ellipsometry, the high resolution is achieved by measuring the amplitude ratio and especially the relative phase shift of two polarization modes parallel and perpendicular to the scattering plane. The availability of a correlator for dynamic light scattering immediately gives access to the dynamics of a surface layer, i. e. breathing modes of the particle. Beside model calculations the poster shows first experimental results.