| 초록 |
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. |
