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SEM surface and cross-sectional’ micrographs of (a) PES and (b–e) ZSM-22/PES membrane materials prepared using different ZSM-22 content: (a,a’) PES, (b,b’) 0.1 ZSM-22/PES, (c,c’) 0.3 ZSM-22/PES, (d,d’) 0.5 ZSM-22/PES and (e,e’) 0.75 ZSM-22/PES.
