caa a22 4500 528785826 20190713030955.0 cr unu---uuuuu 180924s2015 xx s 000 0 eng 10.3929/ethz-b-000102529 doi 10.1038/ncomms8564 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/102529 Understanding nanocellulose chirality and structure-properties relationship at the single fibril level [Elektronische Daten] [Ivan Usov, Gustav Nyström, Jozef Adamcik, Stephan Handschin, Christina Schütz, Andreas Fall, Lennart Bergström, Raffaele Mezzenga] Nat Commun Open access ethresearch Nanocellulose fibrils are ubiquitous in nature and nanotechnologies but their mesoscopic structural assembly is not yet fully understood. Here we study the structural features of rod-like cellulose nanoparticles on a single particle level, by applying statistical polymer physics concepts on electron and atomic force microscopy images, and we assess their physical properties via quantitative nanomechanical mapping. We show evidence of right-handed chirality, observed on both bundles and on single fibrils. Statistical analysis of contours from microscopy images shows a non-Gaussian kink angle distribution. This is inconsistent with a structure consisting of alternating amorphous and crystalline domains along the contour and supports process-induced kink formation. The intrinsic mechanical properties of nanocellulose are extracted from nanoindentation and persistence length method for transversal and longitudinal directions, respectively. The structural analysis is pushed to the level of single cellulose polymer chains, and their smallest associated unit with a proposed 2 × 2 chain-packing arrangement. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Usov Ivan joint author Nyström Gustav joint author Adamcik Jozef joint author Handschin Stephan joint author Schütz Christina joint author Fall Andreas joint author Bergström Lennart joint author Mezzenga Raffaele joint author Nature Communications London : Nature Publishing Group 6, p. 7564 2041-1723 http://hdl.handle.net/20.500.11850/102529 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/102529 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Usov Ivan joint author ETHRESEARCH 700 1- Nyström Gustav joint author ETHRESEARCH 700 1- Adamcik Jozef joint author ETHRESEARCH 700 1- Handschin Stephan joint author ETHRESEARCH 700 1- Schütz Christina joint author ETHRESEARCH 700 1- Fall Andreas joint author ETHRESEARCH 700 1- Bergström Lennart joint author ETHRESEARCH 700 1- Mezzenga Raffaele joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 6, p. 7564 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access