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Characterization and morphology of EFs and EF-Sponges. a Schematic illustration of the fabrication of EF-Sponges; b SEM images of EFs and EF-Sponges with different fiber densities; c The schematic of thermal crosslinking mechanism; d FTIR spectra of EF and EF-Sponge; e Photograph of EF-sponges in different sizes and shapes
