Fig. 4From: Incorporation of Cu3BTC2 nanocrystals to increase the permeability of polymeric membranes in O2/N2 separationFESEM images of mixed-matrix membranes for (a, b) 10 wt% Cu3BTC2 with polysulfone; (c, d) 20 wt% Cu3BTC2 with polysulfone; (e, f) 10 wt% Cu3BTC2 with Matrimid; and (g, h) 20 wt% Cu3BTC2 with MatrimidBack to article page