High Internal Phase Emulsion Stabilization through Prevention of Interdrop Fusionacross Water Drainage Channels
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This study introduces a novel method for stabilizing high internal phase emulsion (HIPE) with biocompatible cellulose surfactant. For stabilization of HIPE, we synthesized alkyl chains-grafted diimine bacteria cellulose nanofibers (BCNFdiC18). First, we synthesized dialdehyde cellulose (DAC) from TEMPO-oxidized bacterial cellulose (TOBC). And then, we grafted octadecylamine using Schiff’s base reaction to introduce amphiphilicity to DAC. From rheological analysis, we observed that BCNFdiC18 enhanced the membrane modulus. We figured out that such a resilient interfacial membrane substantially prevented interdrop fusion across the water drainage channel, which was confirmed theoretically using the modified Stefan-Reynolds equation. These findings highlight that the use of surfactants in the form of nanofibers to form a rigid interfacial film plays a key role in hindering the interfusion of the internal phase and the collapse of the emulsion, which is essential for HIPE stabilization.