Reference : Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angl...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angle X-ray scattering and laser diffraction
Schütz, Christina []
Agthe, Michael []
Fall, Andreas []
Gordeyeva, Korneliya []
Guccini, Valentina []
Salajkova, Michaela []
Plivelic, Tomás []
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Salazar-Alvarez, German []
Bergström, Lennart []
American Chemical Society
Yes (verified by ORBilu)
[en] cellulose ; cholesteric liquid crystal ; nanorod suspension ; x-ray diffraction ; light diffraction ; helix formation
[en] The packing of cellulose nanocrystals (CNC) in the anisotropic chiral nematic phase has been investigated over a wide concentration range by small angle X-ray scattering (SAXS) and laser diffraction. The average separation distance between the CNCs and the average pitch of the chiral nematic phase have been determined over the entire isotropic-anisotropic biphasic region. The average separation distances range from 51 nm, at the onset of the anisotropic phase formation, to 25 nm above 6 vol% (fully liquid crystalline phase) whereas the average pitch varies from 15.5 μm down to ≈2 μm as φ increases from 2.5 up to 6.5 vol%. Using the cholesteric order, we determine that the twist angle between neighboring CNCs increases from about 1 ° up to 4 ° as φ increases from 2.5 up to 6.5 vol%. The dependence of the twisting on the volume fraction was related to the increase in the magnitude of the repulsive interactions between the charged rods as the average separation distance decrease.
Stockholm University, Sweden ; Wallenberg Wood Science Center, Sweden ; University of Oslo, Norway ; MAX IV Laboratory, Sweden ; University of Luxembourg, Physics & Materials Science Research Unit
Researchers ; Professionals

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