Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 2: DRG-DPG SYMPOSIUM Rheology II
CPP 2.7: Vortrag
Montag, 25. Februar 2008, 16:15–16:30, C 130
Shear-induced structural changes in nanoparticle aggregates: a time-resolved x-ray microscopy study — •Günter K. Auernhammer1, Jinyu Zhao1, Doris Vollmer1, Markus Weigand2, and Kai Fauth2 — 1MPI Polymerforschung, Mainz, Germany — 2MPI Metallforschung, Stuttgart, Germany
X-ray microscopy is an imaging technique which allows for a spatial resolution below 35 nm. Can it also be used to investigate shear-induced structural dynamics? When studying response to mechanical (shear) stimuli, the challenge lies in applying the stimuli with precision comparable to spatial resolution. We accomplished this by inserting a piezo actuator-driven shear cell into the focal plane of the x-ray microscope. We demonstrate the possibilities of this novel device by an investigation of shear-induced reorganization of 50 nm sized magnetite particles embedded in a polymer melt. As x-ray microscopy proves suitable for studying structural change, new prospects open up in physics at small length scales.