Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: POSTERS Magnetic Soft Matter

CPP 12.7: Poster

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

Time-resolved X-ray microscopy of nanoparticle aggregates under oscillatory shear — •Günter K. Auernhammer1, Kai Fauth2, 3, Jinyu Zhao1, Markus Weigand2, and Doris Vollmer11Max-Planck-Insitut für Polymerforschung, Ackermannweg 10, 55128 Mainz — 2Max-Planck-Insitut für Metallforschung, Heisenbergstrasse 3,70569 Stuttgart — 3Experimentelle Physik 4, Physikalisches Institut, Am Hubland, 97074 Würzburg

X-ray microscopy is an imaging technique which allows for a spatial resolution below 35 nm. We used it to investigate shear-induced structural dynamics by inserting a piezo actuator-driven shear cell into the focal plane of a scanning transmission x-ray microscope (STXM). We investigate shear-induced reorganization of aggregates of 50 nm sized magnetite particles embedded in a polymer melt. Depending on the amplitude of the applied oscillatory shear, either the aggregates strongly move and reorganize (large amplitudes) or just slightly deform (low amplitudes). We correlated the deformations of the aggregates with their structure (as visible in the STXM) and the amplitude of the applied shear. Comparison of our results to experiments with nonmagnetic colloids is made.

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