Berlin 2018 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 15: Postersession III
BP 15.17: Poster
Dienstag, 13. März 2018, 14:00–16:00, Poster B
Thin-film composite membrane characterization by positron annihilation lifetime spectroscopy — •Marcel Dickmann1, Rhea Verbeke2, Tönjes Koschine3, Werner Egger3, Ivo Vankelecom2, and Christoph Hugenschmidt1 — 1Heinz Maier-Leibnitz Zentrum (MLZ) and Physik Department E21, Technische Universität München, Lichtenbergstraße 1, 85748 Garching, Germany — 2Center for Surface Chemistry and Catalysis, Faculty of Bioscience Engineering Sciences, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium — 3Institut für Angewandte Physik und Messtechnik, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85579 Neubiberg, Germany
Thin-film composite membranes (TFC) are able to purify water via means of different pressure-drive processes such as nanofiltration (NF) and reverse osmosis (RO). Both mechanisms are strongly influenced by the pore size volume and concentration inside the selective layer. With the technique of positron annihilation lifetime spectroscopy (PALS) it is feasible to characterize these attributes. The pulsed low-energy positron system at the Munich research reactor FRM II provides a pulsed positron beam of variable energy, which offers the capability to investigate the free-volume distribution in materials as function of depth. We explain the measurement principle and present results for 3 different TFC membranes.