Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Focus: Rheology I (joint focus with DRG)

CPP 35.7: Vortrag

Donnerstag, 29. März 2012, 17:00–17:15, C 243

Direct observation of translation and rotation of aggregated colloids under mechanical load — •Jennifer Wenzl, Marcel Roth, and Günter K. Auernhammer — Max Planck Institute for Polymer Research, Mainz, Germany

The correlation between single particle interactions and meso- or macroscopic behavior of colloidal and granular matter is still not well understood. The challenge in 3D systems is to measure deformation, translation, and especially rotation of particles and agglomerates. Using confocal microscopy to obtain time resolved 3D imaging we track the particle positions. Introducing internal optical anisotropy allows us additionally to measure the rotation of spherical particles without changing their interaction. From the measured data we determine for every labeled particle both rotation angles. Combining mechanical load with simultaneous 3D microscopic imaging we explore the correlation between local structure, translation and rotation of the particles and the overall deformation of the system.