Table 4
Gas permeation results of PIM-1, PIM-1 f-MWCNTs incorporated MMM
Membrane	Permeance(Nm3/(m2h bar))				Permeabilitya(Barrer)b
	O2	N2	CO2	CH4	O2	N2	CO2	CH4
PIM1-1	1.93	0.69	19.4	1.26	533	190	5,360	348
0.5 wt.% f-MWCNTs/PIM-1	2.07	571	204	6,830	604
MMM
1 wt.% f-MWCNTs/PIM-1	2.19	0.78	25.7	2.47	605	215	7,090	682
MMM
2 wt.% f-MWCNTs/PIM-1	3.49	0.89	29.8	3.69	964	245	8,230	1,020
MMM
3 wt.% f-MWCNTs/PIM-1	2.66	0.79	29.9	3.20	734	218	8,250	883
MMM

^aselective thin layer thickness considered at 0.75 μm from SEM images.

^b

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