Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.27: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Dynamics of wet colloids under mechanical load studied by 3D confocal microscopy — Jennifer Wenzl1, Laurent Gilson2, Ulrich Bröckel2, and •Günter K. Auernhammer1 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2FH Trier, Umwelt-Campus Birkenfeld, Birkenfeld, Germany
Wet colloids are prevalent in many industrial applications, e.g. food processing, or pharmaceuticals. Detailed information of the microscopic behavior of wet colloids is still an open field. The challenge is the 3D visualization on the micro scale of the particle structure and liquid distribution, especially under mechanical deformation.
We present a study on model wet colloids, which can be observed in 3D with confocal microscopy. For a high spatial resolution, the refractive index of all components has to be matched: Silica particles (diameter 7µm), dispersed in a mixture of an aqueous salt solution, and an organic solvent. Partial hydrophobization of the colloid surface allows us to change the contact angle of liquid-liquid interface, i.e. the interaction of the colloids with the liquid interface. We follow the reorganization of this model wet colloids under mechanical load on a single colloid level and discuss the effects due to capillary bridging.