A one-step process to a Janus emulsion

VO/SO: The SO forms the continuous phase. Adding water results in a double emulsion W/VO/SO, while added S gives the combination Janus emulsion (VO + SO)/W. [Display omitted] ► Introduction of aqueous high internal phase ratio (HIPR) (vegetable oil + silicone oil)/water Janus emulsions formed in a one-step bulk process. ► Relating the configuration of the Janus emulsions to the surfactant fraction in the aqueous phase. ► Clarifying the inversion process from the complex Janus emulsion (vegetable oil + silicone oil)/water/vegetable oil/silicone oil to the simpler HIPR (vegetable oil + silicone oil)/water Janus emulsion. ► Demonstrating the presence of surfactant in the next to innermost aqueous phase of a complex Janus emulsion, (vegetable oil + silicone oil)/water/vegetable oil/silicone oil, to bring silicone oil from the continuous phase into the Janus drops in the aqueous phase in question. Aqueous high internal phase volume ratio (O/W 90/10) Janus emulsions of a vegetable oil and a silicone fluid were prepared in a single step emulsification by the common vibrator equipment. The basis for the unique structure is discussed in relation to pair-wise interactions between the components with especial emphasis on the surfactant concentration in the aqueous phase.