Gas separation in nanoporous membranes formed by etching ion irradiated polymer foils |
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| Authors: | W. Ensinger R. Sudowe R. Brandt R. Neumann |
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| Affiliation: | 1. Technische Universität Darmstadt, Department of Materials Science, Fachbereich Materialwissenschaften, Petersenstrasse 23, 64287 Darmstadt, Germany;2. Philipps-Universität Marburg, Department of Chemistry, Kernchemie, Marburg, Germany;3. GSI Helmholtzzentrum für Schwerionenforschung, Materials Research, Darmstadt, Germany;1. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskij pr. 53, 119991 Moscow, Russia;2. Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow Region, Russia;3. National Research Centre ‘Kurchatov Institute’, Kurchatov Sq. 1, 123182 Moscow, Russia;1. Institute of Environmental Engineering, ETH Zurich, Stefano-Franscini-Platz 3, 8093 Zurich, Switzerland;2. Analytical Chemistry, Empa, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland;3. Particle Technology Laboratory, Mechanical Engineering, University of Minnesota, 111 Church St., S.E. , Minneapolis 55455, USA;4. Faculty of Science, The University of Hong Kong, Chong Yuet Ming Physics Building, Pokfulam Rd., Hong Kong;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin-Film Electronics Laboratory, rue de la Maladière 71b, 2002 Neuchâtel, Switzerland;2. IEK5-Photovoltaik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany;1. Physics Department, Faculty of Science, Menoufia University, Shebin El-Koom, Egypt;2. Physics Department, Faculty of Sciences and Arts, Najran University, P. O. Box. 11001, Najran, Saudi Arabia;3. Promising Centre for Sensors and Electronic Devices, Faculty of Arts and Sciences, Najran University, Saudi Arabia;4. Physics Department, Faculty of Education, Ain Shams University, Cairo 11575, Egypt |
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| Abstract: | Polymer membranes with pores with radii in the range of several 10–100 nm were formed by irradiating polyimide foil with highly energetic heavy ions and etching the latent ion tracks with hypochlorite. The aerial density of the pores could be chosen up to an upper limit of 108 pores cm?2, at which too many pores start to overlap. The straight cylindrical pores were tested for their gas permeation and gas separation performance. With a gas mixture of CO and CO2 as model system, gas chromatographic measurements showed that CO penetrates faster through the membrane than CO2, leading to gas separation. This is possible because the mean free path of the molecules is in the order of the pore radius, which is in the transition flow region close to molecular flow conditions. |
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