Fig. 6: Structural analysis of Matrimid-Cyclen membrane models.
a 3D view of Matrimid-Cyclen-n% membrane models (n% is the Cyclen mass loading, n = 0, 5, 10). The gray and blue shades indicate the free volume detected by a probe with a radius of 2.6 Å. b, c Accessible void spaces for He (left) and N2 (right) in Matrimid-Cyclen-n% membranes models (n% is the Cyclen mass loading, n = 0, 5, 10); The red circles in the left picture indicate additional accessible void spaces for He, compared with that of N2. d Interconnected (green) and disconnected (red) voids in Matrimid-Cyclen-n% membrane models (n% is the Cyclen mass loading, n = 0, 5, 10) with respect to a probe of 1.3 Å radius. e The accessible volume of He and N2 as a percentage of the membrane pore volume and the simulated density of the Matrimid-Cyclen membranes. f The average He and N2 transmembrane path was calculated based on accessible void space of the Matrimid-Cyclen membranes. g Pore size distribution of the Matrimid-Cyclen membranes. The pore size distribution was calculated from the corresponding H2 adsorption isotherm using the DFT method.
