Fig. 2: Membrane characterization.
From: Covalent organic framework membrane reactor for boosting catalytic performance

a Depiction of the COF-TpBth/PES composite membrane structure and the wettability comparison between the PES substrate and the COF-TpBth/PES membrane. b SEM images of the COF-TpBth/PES membrane with an inset showing the cross-sectional view. c PXRD patterns, with an inset displaying the chemical structure of COF-TpBth.