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SEM image of AcCNF film, showing fibrillar structure of down to roughly 10–15 nm diameter (ca. 5–10 AGU fibril diameter, based on an 8.2 Å value for the distance between adjacent H‐bonded AGU units in the H‐bonding plane of the cellulose Iβ structure15 and approximately 5 nm for the sputtered layer).
