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Typical appearance of nanocellulose observed by TEM (a,b) and SEM (c). (a) CNF122 and (b) CNC.123 (a) Adapted with permission from ref (122). Copyright 1998 John Wiley and Sons. (b) Adapted with permission from ref (123). Copyright 1991 The Royal Society of Chemistry. (c) SEM image of BC membrane.124 (c) Adapted with permission from ref (124). Copyright 2008 Elsevier.
