Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: POSTERS Polymerphysics

CPP 34.21: Poster

Thursday, February 28, 2008, 17:00–19:30, Poster A

Identification of dissipative and elastic contributions in force spectroscopy curves and tapping mode AFM images for polymeric model surfaces — •Klaus Schröter, Albrecht Petzold, Thomas Henze, and Thomas Thurn-Albrecht — Institut für Physik, Universität Halle-Wittenberg

The separate identification of dissipative and elastic force contributions in Atomic Force Microscopy (AFM) is discussed. We show that within a harmonic approximation the interaction of the AFM tip with the sample surface can be described by average interaction parameters which can be extracted in a simple way from measured data. The method is applied to force spectroscopy curves on hard and soft polymeric model surfaces. The understanding of the basic effects then enables a clearer interpretation of AFM images and an identification of phases in systems with hard-soft contrast as for instance on semicrystalline polymers.