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Filters with <100 nm radius pores for gas separation formed by high-energy ion irradiation of polymers

Sudowe, R. and Vater, P. and Brandt, R. and Vetter, J. and Ensinger, W. (2001):
Filters with <100 nm radius pores for gas separation formed by high-energy ion irradiation of polymers.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, (175-177), Elsevier, pp. 564-568, ISSN 0168583X, [Online-Edition: http://dx.doi.org/10.1016/S0168-583X(00)00676-5],
[Article]

Abstract

In the industry, often gases have to be separated from each other for cleaning and other purposes. In principle, this can be achieved by passing a gas mixture through a filter system when the filter pore diameter is very small being comparable to the size of the mean free path of the gases. Such well-defined pores can be fabricated by high-energy ion irradiation of polymers, combined with chemical etching of the resulting damage in the polymer. Polyimide foil was irradiated with high-energy lead ions. The pores were evolved from the ion tracks by exposing the polymer to a chemical etching agent. The pore radius was determined by scanning electron microscopy (SEM). The shape of the pores through the foil was determined by filling them electrochemically with metal, cutting them into small pieces and investigating the edges again by SEM. The results showed that uniform cylindrical pores with radii below 100 nm could be formed. Using the gas mixture CO/CO2 as a model system for the gas separation the filters were tested for their efficiency. The gas mixture was pumped through the filter and analysed by gas chromatography. The results show that a separation of the gas mixture is possible. Filters fabricated by ion irradiation may act as efficient gas separators.

Item Type: Article
Erschienen: 2001
Creators: Sudowe, R. and Vater, P. and Brandt, R. and Vetter, J. and Ensinger, W.
Title: Filters with <100 nm radius pores for gas separation formed by high-energy ion irradiation of polymers
Language: English
Abstract:

In the industry, often gases have to be separated from each other for cleaning and other purposes. In principle, this can be achieved by passing a gas mixture through a filter system when the filter pore diameter is very small being comparable to the size of the mean free path of the gases. Such well-defined pores can be fabricated by high-energy ion irradiation of polymers, combined with chemical etching of the resulting damage in the polymer. Polyimide foil was irradiated with high-energy lead ions. The pores were evolved from the ion tracks by exposing the polymer to a chemical etching agent. The pore radius was determined by scanning electron microscopy (SEM). The shape of the pores through the foil was determined by filling them electrochemically with metal, cutting them into small pieces and investigating the edges again by SEM. The results showed that uniform cylindrical pores with radii below 100 nm could be formed. Using the gas mixture CO/CO2 as a model system for the gas separation the filters were tested for their efficiency. The gas mixture was pumped through the filter and analysed by gas chromatography. The results show that a separation of the gas mixture is possible. Filters fabricated by ion irradiation may act as efficient gas separators.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Number: 175-177
Publisher: Elsevier
Uncontrolled Keywords: Microfilters, Polyimide, Gas separation, Damage tracks
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: 26 Jun 2012 07:39
Official URL: http://dx.doi.org/10.1016/S0168-583X(00)00676-5
Identification Number: doi:10.1016/S0168-583X(00)00676-5
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