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

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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, 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.

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

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Publication details

The article was received on 02 Aug 2019, accepted on 06 Nov 2019 and first published on 07 Nov 2019


Article type: Paper
DOI: 10.1039/C9SM01551E
Soft Matter, 2019, Advance Article
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    Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface

    V. Calabrese, M. A. da Silva, J. Schmitt, K. M. Z. Hossain, J. L. Scott and K. J. Edler, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01551E

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