Abstract
Cellulose nanosheets similar to those obtained by milling with silicone oil (Zhao et al. in Cellulose 23:2809–2818, 2016) were obtained by mild additive-free milling followed by dispersion in ethanol. Typical nanosheets were of 4 nm thickness, possibly formed by monolayer association of elementary fibrils. The thickness decreased with prolonged milling to 2 nm or less, and the thinnest sheets observed were about 0.4 nm, corresponding to monomolecular layer of cellulose. Further milling caused disappearance of nanosheets due to complete decrystallization. This observation indicates that nanosheet formation is an intermediate stage of decrystallization of cellulose.
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