Advanced

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

Schütz, Christina; Agthe, Michael; Fall, Andreas B.; Gordeyeva, Korneliya; Guccini, Valentina; Salajkova, Michaela; Plivelic, Tomás LU ; Lagerwall, Jan P. F.; Salazar-Alvarez, German and Bergström, Lennart (2015) In Langmuir 31(23). p.6507-6513
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NANO- AND MESOSTRUCTURED MATERIALS, SAXS, Nanocellulose
in
Langmuir
volume
31
issue
23
pages
6507 - 6513
publisher
The American Chemical Society
external identifiers
  • wos:000356755300027
  • scopus:84934954541
ISSN
0743-7463
DOI
10.1021/acs.langmuir.5b00924
language
English
LU publication?
yes
id
96443c09-57b5-44ed-b3db-d5b93bc924a9 (old id 7372026)
date added to LUP
2015-06-20 12:20:12
date last changed
2017-10-08 03:07:05
@article{96443c09-57b5-44ed-b3db-d5b93bc924a9,
  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.},
  author       = {Schütz, Christina and Agthe, Michael and Fall, Andreas B. and Gordeyeva, Korneliya and Guccini, Valentina and Salajkova, Michaela and Plivelic, Tomás and Lagerwall, Jan P. F. and Salazar-Alvarez, German and Bergström, Lennart},
  issn         = {0743-7463},
  keyword      = {NANO- AND MESOSTRUCTURED MATERIALS,SAXS,Nanocellulose},
  language     = {eng},
  number       = {23},
  pages        = {6507--6513},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Rod packing in chiral nematic cellulose nanocrystal dispersions studied by small angle X-ray scattering and laser diffraction},
  url          = {http://dx.doi.org/10.1021/acs.langmuir.5b00924},
  volume       = {31},
  year         = {2015},
}