Rheology of High Internal Phase Emulsions (HIPEs) with Different Interdroplet Interactions

The volume fraction of the dispersed phase exceeds 74% in high internal phase emulsions (HIPEs). The HIPEs have applications in many fields, such as cosmetics, foods, and the production of porous polymers. The HIPEs have solid-like rheological behavior. However, the HIPEs stabilized by different surfactants behave differently under shearing due to the difference in the interdroplet interactions, inducing adhesive and non-adhesive droplets. In addition, the effect of droplet size on the rheological properties of adhesive and non-adhesive HIPEs has not comprehensively been investigated yet. Therefore, in the present work, the effect of droplet size on the dynamic moduli and yield stress of HIPEs with different interdroplet interactions are investigated. Moreover, we investigate the large amplitude oscillatory shear (LAOS) behavior of HIPEs with different interdroplet interactions.