This proposal aims to investigate how the curvature of surfactant assemblies in water/dense CO2 systems can be tuned via the design and mixing of CO2-phillic surfactants. One approach to tune the curvature is the mixing of a negative-curvature-oriented surfactant with a zero-curvature-oriented, and our previous study has already found those. In addition to the surfactant-mixing, rearranging of FC and HC segments in the surfactant to be a hybrid surfactant is also of interest as some hybrid surfactants have been reported to form the rod-like micelles. Greater control over aggregate curvature will allow for the formation of elongated reverse micelles and/or bicontinuous microemulsions, which can increase the CO2 viscosity and also lead to a greater solubilising capacity. Then, it will be key in developing an efficient, effective, and industry-acceptable solubilizer for W/CO2 system.