FILTERS WITH SMALL HOLES (D-LESS-THAN-1-MU-M) AS A TOOL TO SEPARATE GASES

The development of Nuclear Track Microfilters (NTMF) with tiny holes ( 0.15 mu m less-than d less-than 1 mu m) is described for the polyimide foil UPILEX. These NTMFs were used to study the volume through-put of gases like He, CO, CO2 and air as a function of the pore diameter d, and to separate a gas mixture of carbon dioxide and carbon monoxide. P reliminary results will be presented, showing that it is possible to s eparate CO and CO2 gases to some extent. The experimental results will be compared to the ideal separation factor.