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Elasticity of Pickering HIPEs Affected by Particle Layer on Oil-water Interface
채준수,최시영 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
High internal phase emulsions, which their volume fraction of dispersed phase is over 74%, shows solid like property because of their tremendous interfacial area. Many researches claimed models to explain the rheological properties of HIPEs, however, most of them are limited to the surfactant emulsions, and concentrated to the effect of dispersed phase volume fraction. Accordingly, there are very few researches linking rheology of 2D particle layer on the interface of Pickering emulsions. In this study, various concentrations of TiO2 suspensions were used to tune the elasticity of interface, and fabricated to HIPEs. Above specific TiO2 concentration, G’ values normalized with droplet sizes were much higher than that of empirical model of Princen. To figure out this phenomena, we measured compressibility, and interfacial shear rheology of particle layer on interface. From this study, we established the relationship between elasticity of Pickering HIPEs and elasticity of interface.
채준수,최시영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
High internal phase emulsions, which their volume fraction of dispersed phase is over 74%, show solid like property because of their tremendous interfacial area. Many researches tried to explain the rheological properties of HIPEs, however, most of them are for the surfactant emulsions. In the case of Pickering HIPEs, higher G’ values were obtained compared to surfactant HIPEs but there is no clear explanation for this yet. In this study, we studied how colloidal particles attributed to the emulsion rheology. By measuring the rheological properties of continuous phase which is colloidal suspension, we could validate that colloidal suspension in confined geometry between two droplets brought larger G’ of Pickering HIPEs. By reducing gap of parallel plates of rheometer, we could observe the effect of confinement on rheological properties of colloidal suspensions and figured out that liquid to solid transition can occur without changing volume fraction or temperature.