Long term stability of PIM-1. PIM-1 MMM incorporated with f-MWCNTs measured as (a) O2 permeance; (b) relative permeance. Black squares, PIM-1; red circles, 0.5 wt.% MMM; blue triangles, 1 wt.% MMM; green inverted triangles, 2 wt.% MMM; and pink diamonds, 3 wt.% MMM. Temperature, 27°C and feed pressure, 2 bar.
Khan et al. Nanoscale Research Letters 2012 7:504 doi:10.1186/1556-276X-7-504