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Gas separation in nanoporous membranes formed by etching ion irradiated polymer foils

Ensinger, Wolfgang and Sudowe, R. and Brandt, R. and Neumann, R. (2010):
Gas separation in nanoporous membranes formed by etching ion irradiated polymer foils.
79, In: Radiation Physics and Chemistry, (3), Elsevier Science Publishing Company, pp. 204-207, [Online-Edition: http://www.sciencedirect.com/science/article/B6TVT-4X3W44J-3...],
[Article]

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.

Item Type: Article
Erschienen: 2010
Creators: Ensinger, Wolfgang and Sudowe, R. and Brandt, R. and Neumann, R.
Title: Gas separation in nanoporous membranes formed by etching ion irradiated polymer foils
Language: English
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.

Journal or Publication Title: Radiation Physics and Chemistry
Volume: 79
Number: 3
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Ion track membranes; Nanopores; Gas separation
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Feb 2010 13:10
Official URL: http://www.sciencedirect.com/science/article/B6TVT-4X3W44J-3...
Additional Information:

IONIZING RADIATION AND POLYMERS Proceedings of the 8th International Symposium on Ionizing Radiation and Polymers Angra dos Reis, Rio de Janeiro, Brazil, 12-17 October 2008

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