SHI induced nano track polymer filters and characterization |
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Authors: | Y K Vijay |
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Institution: | (1) Department of Physics, University of Rajasthan, Jaipur, 302 004, India |
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Abstract: | Swift heavy ion irradiation produces damage in polymers in the form of latent tracks. Latent tracks can be enlarged by etching
it in a suitable etchant and thus nuclear track etch membrane can be formed for gas permeation / purification in particular
for hydrogen where the molecular size is very small. By applying suitable and controlled etching conditions well defined tracks
can be formed for specific applications of the membranes. After etching gas permeation method is used for characterizing the
tracks. In the present work polycarbonate (PC) of various thickness were irradiated with energetic ion beam at Inter University
Accelerator Centre (IUAC), New Delhi. Nuclear tracks were modified by etching the PC in 6N NaOH at 60 (±1) °C from both sides
for different times to produce track etch membranes. At critical etch time the etched pits from both the sides meet a rapid
increase in gas permeation was observed. Permeability of hydrogen and carbon dioxide has been measured in samples etched for
different times. The latent tracks produced by SHI irradiation in the track etch membranes show enhancement of free volume
of the polymer. Nano filters are separation devices for the mixture of gases, different ions in the solution and isotopes
and isobars separations. The polymer thin films with controlled porosity finding it self as best choice. However, the permeability
and selectivity of these polymer based membrane filters are very important at the nano scale separation. The Swift Heavy Ion
(SHI) induced nuclear track etched polymeric films with controlled etching have been attempted and characterized as nano scale
filters.
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Keywords: | Nanofilters Gas permeability Selectivity |
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