Alcohol induced gelation of TEMPO-oxidized cellulose nanofibril dispersions
da Silva, Marcelo A. ; Calabrese, Vincenzo ; Schmitt, Julien LU ; Celebi, Duygu ; Scott, Janet L. and Edler, Karen J. LU
(2018)
In Soft Matter
14(45).
p.9243-9249
- Abstract
Solvent-induced physical hydrogels of TEMPO-oxidized cellulose nanofibrils (OCNFs) were obtained from aqueous/alcoholic dispersions of fibrils in lower alcohols, namely, methanol, ethanol, 1-propanol and 2-propanol. The sol-gel transition occurs above a critical alcohol concentration of ca. 30 wt% for all alcohols tested. The rheological properties of the hydrogels depend on the nature of the alcohol: for ethanol, 1-propanol and 2-propanol the magnitude of the shear storage modulus follows the alcohol hydrophilicity, whilst methanol produces the weakest gels in the group. Above a second critical concentration, ca. 60 wt% alcohol, phase separation is observed as the gels undergo syneresis. Analysis of small-angle X-ray scattering data... (More)
Solvent-induced physical hydrogels of TEMPO-oxidized cellulose nanofibrils (OCNFs) were obtained from aqueous/alcoholic dispersions of fibrils in lower alcohols, namely, methanol, ethanol, 1-propanol and 2-propanol. The sol-gel transition occurs above a critical alcohol concentration of ca. 30 wt% for all alcohols tested. The rheological properties of the hydrogels depend on the nature of the alcohol: for ethanol, 1-propanol and 2-propanol the magnitude of the shear storage modulus follows the alcohol hydrophilicity, whilst methanol produces the weakest gels in the group. Above a second critical concentration, ca. 60 wt% alcohol, phase separation is observed as the gels undergo syneresis. Analysis of small-angle X-ray scattering data shows that the OCNFs may be modelled as rigid rods. In the presence of lower alcohols, attractive interactions between nanofibrils are present and, above the alcohol concentration leading to gelation, an increase of the OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.
(Less)
- author
- da Silva, Marcelo A.
; Calabrese, Vincenzo
; Schmitt, Julien
LU
; Celebi, Duygu
; Scott, Janet L.
and Edler, Karen J.
LU
- publishing date
- 2018
- type
- Contribution to journal
- publication status
- published
- in
- Soft Matter
- volume
- 14
- issue
- 45
- pages
- 7 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:30418451
- scopus:85056802670
- ISSN
- 1744-683X
- DOI
- 10.1039/C8SM01815D
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © The Royal Society of Chemistry.
- id
- 77e67ca3-30fa-49d9-ba66-78564bef6723
- date added to LUP
- 2023-01-18 09:08:44
- date last changed
- 2025-06-28 03:51:58
@article{77e67ca3-30fa-49d9-ba66-78564bef6723,
abstract = {{<p>Solvent-induced physical hydrogels of TEMPO-oxidized cellulose nanofibrils (OCNFs) were obtained from aqueous/alcoholic dispersions of fibrils in lower alcohols, namely, methanol, ethanol, 1-propanol and 2-propanol. The sol-gel transition occurs above a critical alcohol concentration of ca. 30 wt% for all alcohols tested. The rheological properties of the hydrogels depend on the nature of the alcohol: for ethanol, 1-propanol and 2-propanol the magnitude of the shear storage modulus follows the alcohol hydrophilicity, whilst methanol produces the weakest gels in the group. Above a second critical concentration, ca. 60 wt% alcohol, phase separation is observed as the gels undergo syneresis. Analysis of small-angle X-ray scattering data shows that the OCNFs may be modelled as rigid rods. In the presence of lower alcohols, attractive interactions between nanofibrils are present and, above the alcohol concentration leading to gelation, an increase of the OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.</p>}},
author = {{da Silva, Marcelo A. and Calabrese, Vincenzo and Schmitt, Julien and Celebi, Duygu and Scott, Janet L. and Edler, Karen J.}},
issn = {{1744-683X}},
language = {{eng}},
number = {{45}},
pages = {{9243--9249}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Alcohol induced gelation of TEMPO-oxidized cellulose nanofibril dispersions}},
url = {{http://dx.doi.org/10.1039/C8SM01815D}},
doi = {{10.1039/C8SM01815D}},
volume = {{14}},
year = {{2018}},
}