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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Glasses and Glass Transition (joint session CPP/DY)
CPP 4.6: Vortrag
Montag, 16. März 2020, 11:00–11:15, ZEU 255
X-ray computed tomography of glass foams with controlled bi-modal pore size distribution — •Cristine S. de Oliveira1, Richard Kohns2, Felix Meyerhoefer2, Matthias Neumann3, Dirk Enke2, Volker Schmidt3, Ralf B. Wehrspohn1, and Juliana Martins de S. e Silva1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Institut für Technische Chemie, Universität Leipzig, Germany — 3Institut für Stochastik, Universität Ulm, Germany
Glass foams are materials consisting of a light-weight porous glass structure of special importance in the fields of civil engineering and bio-implants. Typically, their synthesis involves the thermal foaming of a powder mixture of glass with a foaming agent that decomposes at the foaming temperature, resulting in a solid glass skeleton permeated by empty pores. In our work, we synthesized a series of glass foams followed by a phase-separation procedure and acid leaching. We used a powdered mixture of silica-based glasses, MnO2 and C which we submitted to a foaming process at 815 oC. Afterwards, the material was left to cool inside the oven to temperatures around 500 oC and maintained at a constant temperature for phase separation. We then acid leached, washed and dried the samples. Based on the results obtained using X-ray CT at the micro and nanometer scales we observed that slight changes in the preparation procedure resulted in foams with different porosity, pore sizes, pore volumes and sphericity.