Cellulose nanosheets formed by mild additive-free ball milling
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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.
KeywordsCellulose nanosheets Mild ball milling Elementary fibril Monomolecular sheet
This study was supported by the National Natural Science Foundation of China (No. 51733009) and Chinese Academy of Sciences Visiting Professorships.
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