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Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface

Calabrese, Vincenzo ; da Silva, Marcelo A. ; Schmitt, Julien LU ; Hossain, Kazi M. Zakir ; Scott, Janet L. and Edler, Karen J. LU orcid (2020) In Soft Matter 16(2). p.357-365
Abstract

Interfacial gels, obtained by the interaction of water-dispersible oxidised cellulose nanofibrils (OCNF) and oil-soluble oleylamine (OA), were produced across water/oil (W/O) interfaces. Surface rheology experiments showed that the complexation relies on the charge coupling between the negatively-charged OCNF and OA. Complexation across the W/O interface was found to be dependent on the ζ-potential of the OCNF (modulated by electrolyte addition), leading to different interfacial properties. Spontaneous OCNF adsorption at the W/O interface occurred for particles with ζ-potential more negative than -30 mV, resulting in the formation of interfacial gels; whilst for particles with ζ-potential of ca. -30 mV, spontaneous adsorption occurred,... (More)

Interfacial gels, obtained by the interaction of water-dispersible oxidised cellulose nanofibrils (OCNF) and oil-soluble oleylamine (OA), were produced across water/oil (W/O) interfaces. Surface rheology experiments showed that the complexation relies on the charge coupling between the negatively-charged OCNF and OA. Complexation across the W/O interface was found to be dependent on the ζ-potential of the OCNF (modulated by electrolyte addition), leading to different interfacial properties. Spontaneous OCNF adsorption at the W/O interface occurred for particles with ζ-potential more negative than -30 mV, resulting in the formation of interfacial gels; whilst for particles with ζ-potential of ca. -30 mV, spontaneous adsorption occurred, coupled with augmented interfibrillar interactions, yielding stronger and tougher interfacial gels. On the contrary, charge neutralisation of OCNF (ζ-potential values more positive than -30 mV) did not allow spontaneous adsorption of OCNF at the W/O interface. In the case of favourable OCNF adsorption, the interfacial gel was found to embed oil-rich droplets-a spontaneous emulsification process.

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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
in
Soft Matter
volume
16
issue
2
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:31720672
  • scopus:85077068544
ISSN
1744-683X
DOI
10.1039/c9sm01551e
language
English
LU publication?
no
additional info
Publisher Copyright: This journal is © The Royal Society of Chemistry.
id
69c4e25e-dcea-4a64-a467-e65946c68baf
date added to LUP
2023-01-18 09:03:00
date last changed
2024-04-04 06:24:05
@article{69c4e25e-dcea-4a64-a467-e65946c68baf,
  abstract     = {{<p>Interfacial gels, obtained by the interaction of water-dispersible oxidised cellulose nanofibrils (OCNF) and oil-soluble oleylamine (OA), were produced across water/oil (W/O) interfaces. Surface rheology experiments showed that the complexation relies on the charge coupling between the negatively-charged OCNF and OA. Complexation across the W/O interface was found to be dependent on the ζ-potential of the OCNF (modulated by electrolyte addition), leading to different interfacial properties. Spontaneous OCNF adsorption at the W/O interface occurred for particles with ζ-potential more negative than -30 mV, resulting in the formation of interfacial gels; whilst for particles with ζ-potential of ca. -30 mV, spontaneous adsorption occurred, coupled with augmented interfibrillar interactions, yielding stronger and tougher interfacial gels. On the contrary, charge neutralisation of OCNF (ζ-potential values more positive than -30 mV) did not allow spontaneous adsorption of OCNF at the W/O interface. In the case of favourable OCNF adsorption, the interfacial gel was found to embed oil-rich droplets-a spontaneous emulsification process.</p>}},
  author       = {{Calabrese, Vincenzo and da Silva, Marcelo A. and Schmitt, Julien and Hossain, Kazi M. Zakir and Scott, Janet L. and Edler, Karen J.}},
  issn         = {{1744-683X}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{357--365}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Soft Matter}},
  title        = {{Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface}},
  url          = {{http://dx.doi.org/10.1039/c9sm01551e}},
  doi          = {{10.1039/c9sm01551e}},
  volume       = {{16}},
  year         = {{2020}},
}