Figure 11: (a) Evolution of (i) the molar fraction of CO2 in both the permeate and retentate, and (ii) CO2:N2 selectivity, as a function of the stage-cut, for a (20% CO2: 80% N2) feed mixture, for the membrane n°2 grafted with fluorosilane (C8FSi). The horizontal line corresponds to the initial concentration in CO2 (CO2 Feed: 0.2); (b) Evolution of the CO2:N2 selectivity, as a function of the stage-cut for a (20% CO2: 80% N2) feed mixture, for the membrane n°2 grafted with glymo.