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Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Colloids and Complex Fluids I (joint session BP/CPP/DY, organized by BP)

CPP 5.6: Vortrag

Montag, 7. März 2016, 10:45–11:00, H45

Finding descriptive features for the characterization of the coarsening dynamics of three dimensional foams — •Jonas Dittmann1, Anja Eggert2, Martina Lambertus1, Jannika Dombrowski3, Alexander Rack4, and Simon Zabler1,21Lehrstuhl für Rötngenmikroskopie, Fakultät für Physik und Astronomie, Universität Würzburg, Germany — 2Fraunhofer EZRT, Fürth, Germany — 3Wissenschaftszentrum Weihenstephan, Technische Universität München, Germany — 4European Synchrotron Radiation Facility (ESRF), Grenoble, France

Understanding the coarsening behavior of foams is essential for their deliberate design. The coarsening theories by Lifshitz, Slyozov and Wagner (LSW) as well as Glazier provide concise coarsening models with descriptive parameters that may enable systematic studies on the effects of different foam constituents.

Wet polydisperse beta-Lactoglobulin foam was imaged by fast synchrotron micro computed tomography over a period of 15 minutes in intervals of 2 to 5 minutes. The growth behavior of about 2×105 pores is individually observed and statistically analyzed as a function of pore radius as well as number of neighboring pores.

The three-dimensional analog of von Neumann’s law by Glazier is confirmed as a fitting empirical description of the mean coarsening behavior, whereby the critical number of neighbors discriminating between shrinkage and growth is found to be 13.2±5.5. Qualitative features of LSW theory are observed as well: the pore’s growth rate increases with their size and a critical radius can be identified.

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