Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface - Archive ouverte HAL
Article Dans Une Revue Soft Matter Année : 2020

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

Résumé

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 z-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 zeta-potential more negative than -30 mV, resulting in the formation of interfacial gels; whilst for particles with zeta-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 (zeta-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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Dates et versions

hal-03037326 , version 1 (03-12-2020)

Identifiants

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Vincenzo Calabrese, Marcelo da Silva, Julien Schmitt, Kazi Hossain, Janet Scott, et al.. Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface. Soft Matter, 2020, 16 (2), pp.357-365. ⟨10.1039/c9sm01551e⟩. ⟨hal-03037326⟩
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