Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface
(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.
(Less)
- author
- Calabrese, Vincenzo ; da Silva, Marcelo A. ; Schmitt, Julien LU ; Hossain, Kazi M. Zakir ; Scott, Janet L. and Edler, Karen J. LU
- publishing date
- 2020
- 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}}, }