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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: POSTERS Polymer Physics

CPP 13.11: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Quantitative analysis of energy dissipation processes during tapping mode atomic force microscopy of soft materials. — •Eike-Christian Spitzner, Christian Riesch, Christian Dietz, and Robert Magerle — Chemische Physik, TU Chemnitz, D-09107 Chemnitz

We aim for a better understanding of the energy dissipation processes during tapping mode atomic force microscopy of soft materials. As model systems we investigate thin films of polystyrene homopolymer and polystyrene-block-polybutadiene diblock copolymers. The mechanical properties of the specimen are varied by controlled swelling in chloroform vapor. With an atomic force microscope operated in tapping mode, the energy dissipated between tip and sample, as well as the tip indentation into the polymer film, are determined. Polystyrene and polybutadiene differ in the amount of dissipated energy as well as in the detailed shape of energy dissipation curves as function of amplitude set point. Possible energy dissipation processes causing these differences are discussed.