Article (Scientific journals)
Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angle X-ray scattering and laser diffraction
Schütz, Christina; Agthe, Michael; Fall, Andreas et al.
2015In Langmuir, 31 (23), p. 6507-6513
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Keywords :
cellulose; cholesteric liquid crystal; nanorod suspension; x-ray diffraction; light diffraction; helix formation
Abstract :
[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.
Research center :
Stockholm University, Sweden
Wallenberg Wood Science Center, Sweden
University of Oslo, Norway
MAX IV Laboratory, Sweden
University of Luxembourg, Physics & Materials Science Research Unit
Disciplines :
Chemistry
Author, co-author :
Schütz, Christina
Agthe, Michael
Fall, Andreas
Gordeyeva, Korneliya
Guccini, Valentina
Salajkova, Michaela
Plivelic, Tomás
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Salazar-Alvarez, German
Bergström, Lennart
External co-authors :
yes
Language :
English
Title :
Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angle X-ray scattering and laser diffraction
Publication date :
28 May 2015
Journal title :
Langmuir
ISSN :
1520-5827
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
31
Issue :
23
Pages :
6507-6513
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 03 June 2015

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