Fig. 4.

CNF-based materials and their application performances. a–d Optical and SEM images of a CNF-M, b isotropic CNF-A, c lamellar CNF-A, and d honeycomb CNF-A. e Interfibrous binding points in the honeycomb CNF-A formed by photo-induced chemical crosslinking. f Photograph of CNF-A under folding. g Stress–strain curves of CNF-A under different strains in water. h Photograph and stress–strain curves of CNF-A under 500 compression cycles in water. i Illustration of CNF-A as an UES material and the harsh service environment it encounters during application. j U adsorption capacities of different materials. k Comparisons of U adsorption capacity among reported adsorbents. l Diamond plot comparing the features of CNF-As with other COF-based aerogels designed for UES