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Article Dans Une Revue Nanoscale Année : 2019

Electron microdiffraction reveals the nanoscale twist geometry of cellulose nanocrystals

Résumé

7 Nanocellulose consisting of crystalline cellulose nanoparticles has a high potential to 8 serve as a building block for bio-based functional materials. The intrinsic chirality of 9 cellulose crystals provides them with high added values such as optical properties and chiral 10 induction ability. At the nanoscale, this chirality is connected to the right-handed longitudinal 11 twisting of these fibrous crystallites. However, this nanoscale fibrillar twist has been a matter 12 of debate due to contradictory data between ultrastructural observations and molecular 13 simulations and so far, the exact twist geometry has not been elucidated. Here, an electron 14 microdiffraction (µED) analysis under cryogenic condition reveals the continuous twisting of 15 cellulose nanocrystals (CNCs) in aqueous suspension. This intrinsic regular twist is 16 drastically modified to discontinuous sharp twists when the CNCs are dried on flat surface. 17 The present µED-based analysis at the single nanoparticle level allows establishing 18 quantitative structure-properties relationship of various solid and colloidal nanocellulose 19 systems. 20 21
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Dates et versions

hal-02360161 , version 1 (14-11-2020)

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Yu Ogawa. Electron microdiffraction reveals the nanoscale twist geometry of cellulose nanocrystals. Nanoscale, 2019, ⟨10.1039/C9NR06044H⟩. ⟨hal-02360161⟩
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