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Nanostructure and surface property of COF-BBT. (a) SEM image and (b and c) TEM images of COF-BBT nanofibers; the inset of (c) is the fast Fourier-transform (FTT) pattern of the hexagonal mesopore arrangement at the nanofiber cross section; (d) N2 isotherm of COF-BBT; the inset shows the corresponding pore size distribution curve; (e) water contact angles of COF-BBT and COF-Ph.
