Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: New Instruments and Methods

CPP 11.2: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Calibration and application of novel thermal cantilever in the field of polymer science — •Thomas Fischinger and Sabine Hild — Department of Polymer Science, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria

To satisfy the demands of designing polymers for advanced applications more detailed information about physical and chemical properties on the microscopic scale are required. Scanning probe microscopy has shown to be an proper tool. The development of a new generation of heatable cantilevers enhances prospects also into the nano-thermal characterization. A central point in the work with such probes is an appropriate and accurate temperature calibration of the probe. In this research the influences of sample preparation and experimental set-up on the calibration have been investigated. To minimized external influences the standard method is compared to the independent calibration of tip temperature using the Raman peak location method. With our basic experimental set-up, conventional Local Thermal Analysis in an unprecedented range of scale is available, which allows the detection of transition points such as melting point and softening point, possible. However, the determination of the glass transition point has reached its limits here, and is therefore being replaced by a new technique. Dual AC Resonance Tracking is a combination of atomic force acoustic microscopy and band excitation, which enables the unambiguous detection of temperature-induced changes in the contact stiffness of the tip-surface junction.