Changes in the molecular structure of cellulose nanocrystals upon treatment with solvents

Feizi, Zahra Hosseinpour; Fatehi, Pedram

doi:10.1007/s10570-021-03972-x

Cited by 9 publications

(2 citation statements)

References 62 publications

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“…On the other hand, the effect of DMSO treatment on the structural ordering of cellulose is less studied. Feizi (2021) reported that partial transformation from cellulose I to II occurred when cellulose nanocrystals (CNCs) were treated with DMSO, accompanied by a significantly enhanced wettability (Feizi and Fatehi 2021). In contrast, Yang (2017) reported unchanged cellulose I crystalline structure of nanofibrillated cellulose upon DMSO soaking (Yang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Vapour-induced phase transformation in ultrathin cellulose films

Liu

Mei

et al. 2023

Cellulose

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The structural transformation of thin amorphous cellulose films in water and organic solvent vapour has been studied using grazing-incidence X-ray diffraction and atomic force microscopy. Amorphous cellulose films transform to cellulose II upon exposure to water vapour, and cellulose IV II in the dimethyl sulfoxide (DMSO) vapour. The anisotropy in crystalline orientation has developed during the vapour exposure, due both to the surface and confinement effects in thin film geometry. The findings imply a novel route of the vapour treatment of cellulose films to obtain unique structures.

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Section: Introductionmentioning

confidence: 99%

Vapour-induced phase transformation in ultrathin cellulose films

Liu

Mei

et al. 2023

Cellulose

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“…Cellulose macromolecular structures, including cellulose nanocrystals, are assembled as a result of hydrogen bonding and van der Waals force. − It was reported that the intersheet binding energy between monomolecular sheets (100 plane) is about 8 times smaller than that between interchains (110 or 11̅0 plane) . Therefore, the 100 planes are more easily broken by external forces than those between 110 or 11̅0 planes .…”

Section: Introductionmentioning

confidence: 99%

Cellulose Hollow Annular Nanoparticles Prepared from High-Intensity Ultrasonic Treatment

Gao

Zhang

et al. 2022

ACS Nano

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Cellulose nanomaterials, such as cellulose nanocrystals (CNCs), have received enormous attention in various material research fields due to their unique properties and green/sustainable nature, among other qualities. Herein, we report hollow-type annular cellulose nanocrystals (HTA-CNCs), which are generated by following a high-intensity ultrasonic treatment. The advanced aberration-corrected transmission electron microscopy results reveal that HTA-CNCs exhibit ring structures with a typical diameter of 10.0−30.0 nm, a width of 3.0−4.0 nm, and a thickness of 2.0−5.0 nm, similar to those of elementary crystallites. The X-ray diffraction measurements show that the as-prepared HTA-CNCs maintain the cellulose I structure. The changes in structure and hydrogenbonding characteristics of HTA-CNCs are further determined based on the FT-IR results after deconvolution fitting, showing that three types of hydrogen bonds decrease and the content of free OH increases in HTA-CNCs compared with those in the original CNCs. Furthermore, molecular dynamics simulation is carried out to support the experimental study. The formation of HTA-CNCs might be attributed to the structural change and entropy increase. The hollow-type annular CNCs may have broad value-added applications as cellulose nanomaterials in different fields.

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