TEMPO-oxidized cellulose nanofibers (TOCNs) have unique advantages such as high viscosity, high thixotropy -sprayable gel-, emulsifying and suspending ability and inhibition of aggregation. Especially emulsifying ability is important for some applications. However the mechanism of emulsifying ability is not cleared. In this study, we study the emulsibility and stability of emulsion with TOCN by preparing oil in water emulsion under various conditions. As a result, it was fund that TOCN concentration and the properties of the oil affect to emulsification with TOCN. Moreover, the emulsifying mechanism with TOCN was investigated from the aspects of interfacial free energy (dG). Relationships between the O/W interfacial tension and the adsorbed amount of TOCN onto oil droplet were evaluated using various oils with different interfacial tensions (γ). The oils with higher interfacial tension gave higher adsorbed amount of TOCN. The O/W surface area (dA) and the adsorbed amount of TOCN were also evaluated. The larger surface area of O/W gave the higher adsorbed amounts of TOCN. The interfacial free energy of the samples prepared as above was calculated from the interfacial tension and surface area of O/W (dG = γdA). The higher interfacial free energy of O/W gives the higher adsorbed amount of TOCN. This result suggests that TOCN adsorbs onto oil droplets to decrease dG of emulsion system when the dG<sub>O/W</sub> is high.

Emulsibility and stability mechanism of oil in water emulsion with TEMPO-oxidized cellulose nanofibers

255th National Meeting (2018)

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