Achieving High Stability in Water-in-Water Emulsions Using Surface-Modified Colloidal Particles
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초록
내용
Water-in-water (W/W) emulsions based on aqueous two-phase systems (ATPSs) are composed entirely of water, making them suitable for applications in food, cosmetics, and biomedical fields that require high biocompatibility and environmental friendliness. However, due to very low interfacial tension, colloidal particles used as stabilizers are easily desorbed, thus hindering the achievement of high emulsion stability. In this study, to address this issue, we thoroughly investigated the impact of colloidal particles surface-modified with hydrophilic polymers on the stability of W/W emulsions (PEG/Dextran system). As a result, we found that the particles were densely packed in the dispersed droplets, thereby dramatically maximizing the stability of W/W emulsions without any change in droplet size for approximately 3 months. In addition, we successfully confirmed that by adjusting various conditions such as particle size and interfacial tension, it was possible to control the droplet size.