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(a) Illustration of the in situ growth of ZIF-7 in PI matrix. (b) Scanning electron microscope image of the cross-section of the ZIF-7/PI MMM. The inset shows a transmission electron microscope image of the in situ formed phase III ZIF-7 fillers in the PI matrix. Reprinted with permission from ref. [99]. Copyright 2020 Royal Society of Chemistry.
