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Understanding heat driven gelation of anionic cellulose nanofibrils : Combining saturation transfer difference (STD) NMR, small angle X-ray scattering (SAXS) and rheology

Calabrese, Vincenzo ; Muñoz-García, Juan C. ; Schmitt, Julien LU ; da Silva, Marcelo A. ; Scott, Janet L. ; Angulo, Jesús ; Khimyak, Yaroslav Z. and Edler, Karen J. LU orcid (2019) In Journal of Colloid and Interface Science 535. p.205-213
Abstract

A novel mechanism of heat-triggered gelation for oxidised cellulose nanofibrils (OCNF) is reported. We demonstrate that a synergistic approach combining rheology, small-angle X-ray scattering (SAXS) and saturation transfer difference NMR (STD NMR) experiments enables a detailed characterisation of gelation at different length scales. OCNF dispersions experience an increase in solid-like behaviour upon heating as evidenced by rheological studies, associated with enhanced interfibrillar interactions measured using SAXS. Interactions result in an increased fibrillar overlap and increased population of confined water molecules monitored by STD NMR. In comparison, cationic cellulose nanofibrils (produced by reaction of cellulose with... (More)

A novel mechanism of heat-triggered gelation for oxidised cellulose nanofibrils (OCNF) is reported. We demonstrate that a synergistic approach combining rheology, small-angle X-ray scattering (SAXS) and saturation transfer difference NMR (STD NMR) experiments enables a detailed characterisation of gelation at different length scales. OCNF dispersions experience an increase in solid-like behaviour upon heating as evidenced by rheological studies, associated with enhanced interfibrillar interactions measured using SAXS. Interactions result in an increased fibrillar overlap and increased population of confined water molecules monitored by STD NMR. In comparison, cationic cellulose nanofibrils (produced by reaction of cellulose with trimethylglycidylammonium chloride) were found to be heat-unresponsive.

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author
; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Heat induced gelation, Hydrogel, Rheology, Saturation transfer difference NMR, SAXS, TEMPO oxidised cellulose, Water confinement
in
Journal of Colloid and Interface Science
volume
535
pages
9 pages
publisher
Academic Press
external identifiers
  • scopus:85054315255
  • pmid:30293046
ISSN
0021-9797
DOI
10.1016/j.jcis.2018.09.085
language
English
LU publication?
no
additional info
Publisher Copyright: © 2018
id
89534fab-d374-4acc-b70b-733e030fb39c
date added to LUP
2023-01-18 09:08:20
date last changed
2025-04-04 20:41:16
@article{89534fab-d374-4acc-b70b-733e030fb39c,
  abstract     = {{<p>A novel mechanism of heat-triggered gelation for oxidised cellulose nanofibrils (OCNF) is reported. We demonstrate that a synergistic approach combining rheology, small-angle X-ray scattering (SAXS) and saturation transfer difference NMR (STD NMR) experiments enables a detailed characterisation of gelation at different length scales. OCNF dispersions experience an increase in solid-like behaviour upon heating as evidenced by rheological studies, associated with enhanced interfibrillar interactions measured using SAXS. Interactions result in an increased fibrillar overlap and increased population of confined water molecules monitored by STD NMR. In comparison, cationic cellulose nanofibrils (produced by reaction of cellulose with trimethylglycidylammonium chloride) were found to be heat-unresponsive.</p>}},
  author       = {{Calabrese, Vincenzo and Muñoz-García, Juan C. and Schmitt, Julien and da Silva, Marcelo A. and Scott, Janet L. and Angulo, Jesús and Khimyak, Yaroslav Z. and Edler, Karen J.}},
  issn         = {{0021-9797}},
  keywords     = {{Heat induced gelation; Hydrogel; Rheology; Saturation transfer difference NMR; SAXS; TEMPO oxidised cellulose; Water confinement}},
  language     = {{eng}},
  month        = {{02}},
  pages        = {{205--213}},
  publisher    = {{Academic Press}},
  series       = {{Journal of Colloid and Interface Science}},
  title        = {{Understanding heat driven gelation of anionic cellulose nanofibrils : Combining saturation transfer difference (STD) NMR, small angle X-ray scattering (SAXS) and rheology}},
  url          = {{http://dx.doi.org/10.1016/j.jcis.2018.09.085}},
  doi          = {{10.1016/j.jcis.2018.09.085}},
  volume       = {{535}},
  year         = {{2019}},
}