Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster: Micro- and Nanofluidics
CPP 35.8: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Liquid Morphologies in granulates with various wettability — •Marc Schaber1, Somnath Karmakar1, Mario Scheel3, Martin Brinkmann2, Marco Di Michiel3, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organisation, Bunsenstraße 10, D-37073 Göttingen — 3European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38000 Grenoble
Adding liquid to dry granulates causes the formation of a network of capillary bridges and complex liquid structures inside the granulates and typically a stiffening of the granulate is observed. Depending on wettability of the granulate different liquid structures are formed and lead to different mechanical properties. By means of computed X-ray tomography we explore the static three dimensional packing geometry of granulates and the emerging liquid distribution within them. As granulates we use glass and basalt microspheres and mixtures of both. The glass microspheres have a low contact and the basalt microspheres have a large contact angle for the used aqueous solution. Using time resolved X-ray tomography we furthermore explore the liquid equilibration process as function of wettability of the granulate. The found liquid redistribution and the emerging liquid structures are compared to the mechanical properties of the respective granulate with identical liquid content.