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 produce 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 show 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 OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.
Original languageEnglish
Pages (from-to)9243-9249
Number of pages7
JournalSoft Matter
Volume14
Issue number45
Early online date22 Oct 2018
DOIs
Publication statusPublished - 7 Dec 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Alcohol induced gelation of TEMPO-oxidized cellulose nanofibril dispersions. / da Silva, Marcelo; Calabrese, Vincenzo; Schmitt, Julien; Celebi, Duygu; Scott, Janet L; Edler, Karen J.

In: Soft Matter, Vol. 14, No. 45, 07.12.2018, p. 9243-9249.

Research output: Contribution to journalArticle

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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 produce 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 show 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 OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.",
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AU - da Silva, Marcelo

AU - Calabrese, Vincenzo

AU - Schmitt, Julien

AU - Celebi, Duygu

AU - Scott, Janet L

AU - Edler, Karen J

PY - 2018/12/7

Y1 - 2018/12/7

N2 - 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 produce 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 show 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 OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.

AB - 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 produce 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 show 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 OCNF cross-section is observed, suggesting alcohol induced aggregation of nanofibrils.

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