TEMPO-oxidised cellulose nanofibrils; Probing the mechanisms of gelation : Via small angle X-ray scattering
(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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- author
- Schmitt, Julien LU ; Calabrese, Vincenzo ; Da Silva, Marcelo A. ; Lindhoud, Saskia ; Alfredsson, Viveka LU ; Scott, Janet L. and Edler, Karen J. LU
- organization
- publishing date
- 2018-01-01
- 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
-
- scopus:85048518901
- pmid:29850680
- 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
- 2024-03-01 21:39:35
@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> > 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 (ν<sub>RPA</sub> < 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}}, }