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Transmission electron microscopy (TEM) captures of carbon nanofibers (CNFs) (a) and ultrathin sections of calcium-cross-linked alginate with CNFs at 1% w/w ratio (b); cryo-scanning electron microscopy (cryoSEM) of calcium-crosslinked alginate films, neat (c,e) and with CNFs (d,f), hydrated at 26 ± 0.5 °C and 37 ± 0.5 °C for 1 day, respectively. Reprinted with permission from Elsevier [68].
