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TEMPO-oxidised cellulose nanofibrils; Probing the mechanisms of gelation : Via small angle X-ray scattering

Schmitt, Julien LU ; Calabrese, Vincenzo ; Da Silva, Marcelo A. ; Lindhoud, Saskia ; Alfredsson, Viveka LU ; Scott, Janet L. and Edler, Karen J. LU (2018) In Physical Chemistry Chemical Physics 20(23). p.16012-16020
Abstract

The structure of dispersions of TEMPO-oxidised cellulose nanofibrils (OCNF), at various concentrations, in water and in NaCl aqueous solutions, was probed using small angle X-ray scattering (SAXS). OCNF are modelled as rod-like particles with an elliptical cross-section of 10 nm and a length greater than 100 nm. As OCNF concentration increases above 1.5 wt%, repulsive interactions between fibrils are evidenced, modelled by the interaction parameter νRPA > 0. This corresponds to gel-like behaviour, where G′ > G′′ and the storage modulus, G′, shows weak frequency dependence. Hydrogels can also be formed at OCNF concentration of 1 wt% in 0.1 M NaCl(aq). SAXS patterns shows an increase of the intensity at low angle that is... (More)

The structure of dispersions of TEMPO-oxidised cellulose nanofibrils (OCNF), at various concentrations, in water and in NaCl aqueous solutions, was probed using small angle X-ray scattering (SAXS). OCNF are modelled as rod-like particles with an elliptical cross-section of 10 nm and a length greater than 100 nm. As OCNF concentration increases above 1.5 wt%, repulsive interactions between fibrils are evidenced, modelled by the interaction parameter νRPA > 0. This corresponds to gel-like behaviour, where G′ > G′′ and the storage modulus, G′, shows weak frequency dependence. Hydrogels can also be formed at OCNF concentration of 1 wt% in 0.1 M NaCl(aq). SAXS patterns shows an increase of the intensity at low angle that is modelled by attractive interactions (νRPA < 0) between OCNF, arising from the screening of the surface charge of the fibrils. Results are supported by ζ potential and cryo-TEM measurements.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
20
issue
23
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:29850680
  • scopus:85048518901
ISSN
1463-9076
DOI
10.1039/c8cp00355f
language
English
LU publication?
yes
id
eccaac0d-0dfd-4940-80ca-a745217b7093
date added to LUP
2018-07-03 11:47:51
date last changed
2021-10-06 04:30:17
@article{eccaac0d-0dfd-4940-80ca-a745217b7093,
  abstract     = {<p>The structure of dispersions of TEMPO-oxidised cellulose nanofibrils (OCNF), at various concentrations, in water and in NaCl aqueous solutions, was probed using small angle X-ray scattering (SAXS). OCNF are modelled as rod-like particles with an elliptical cross-section of 10 nm and a length greater than 100 nm. As OCNF concentration increases above 1.5 wt%, repulsive interactions between fibrils are evidenced, modelled by the interaction parameter ν<sub>RPA</sub> &gt; 0. This corresponds to gel-like behaviour, where G′ &gt; G′′ and the storage modulus, G′, shows weak frequency dependence. Hydrogels can also be formed at OCNF concentration of 1 wt% in 0.1 M NaCl(aq). SAXS patterns shows an increase of the intensity at low angle that is modelled by attractive interactions (ν<sub>RPA</sub> &lt; 0) between OCNF, arising from the screening of the surface charge of the fibrils. Results are supported by ζ potential and cryo-TEM measurements.</p>},
  author       = {Schmitt, Julien and Calabrese, Vincenzo and Da Silva, Marcelo A. and Lindhoud, Saskia and Alfredsson, Viveka and Scott, Janet L. and Edler, Karen J.},
  issn         = {1463-9076},
  language     = {eng},
  month        = {01},
  number       = {23},
  pages        = {16012--16020},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {TEMPO-oxidised cellulose nanofibrils; Probing the mechanisms of gelation : Via small angle X-ray scattering},
  url          = {http://dx.doi.org/10.1039/c8cp00355f},
  doi          = {10.1039/c8cp00355f},
  volume       = {20},
  year         = {2018},
}