Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angle X-ray scattering and laser diffraction

Christina Schütz, Michael Agthe, Andreas B. Fall, Korneliya Gordeyeva, Valentina Guccini, Michaela Salajkova, Tomás Plivelic, Jan P. F. Lagerwall, German Salazar-Alvarez, Lennart Bergström

Research output: Contribution to journalArticlepeer-review

130 Citations (SciVal)

Abstract

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 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 decreases.
Original languageEnglish
Pages (from-to)6507-6513
JournalLangmuir
Volume31
Issue number23
DOIs
Publication statusPublished - 2015

Subject classification (UKÄ)

  • Chemical Sciences

Keywords

  • NANO- AND MESOSTRUCTURED MATERIALS
  • SAXS
  • Nanocellulose

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