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CPP: Chemische Physik und Polymerphysik

CPP 12: POSTER Colloids, Nanoparticles and Self-Organizing Systems

CPP 12.8: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Modeling of anisotropic silica clusters — •Gerald J. Schneider and Dietmar Göritz — Institut für Physik, Universität Regensburg, 93040 Regensburg

The mechanical properties of elastomers can be improved by adding precipitated silica. The hierarchical structure of this colloidal filler consists of primary particles, having typical diameters of about 20 nm. During an agglomeration process clusters are formed, which are build up from these primary particles. Regarding the mechanical properties of elastomers, structural changes of silica clusters due to external forces are of interest. These rearrangement during deformation can be studied by means of small-angle scattering experiments. To describe quantitatively the experimental results we introduce a new model, based only on the mathematics of fractals, which is able to predict experimental scattering patterns. With the help of experimental data the usability of the theory will be demonstrated.