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Table 3
Comparison of various gas pair selectivities of PIM-1 and MMM of f-MWCNTs and MWCNTs
Membrane		Selectivity
Membrane	O₂/N₂	CO₂/N₂	CO₂/CH₄
PIM-1	2.8	28.2	15.4
f-MWCNTs/PIM-1 MMM	2.8	32.9	10.4
Pristine MWCNTs/PIM-1 MMM	2.5	16.3	8.1

Khan et al. Nanoscale Research Letters 2012 7:504 doi:10.1186/1556-276X-7-504

Table 3