New types of water-in-CO2 microemulsions using mixed surfactant systems will be investigated by high-pressure SANS (HP-SANS). Exciting new results (see report on RB820030) have provided evidence for the formation of hydrated micelles in CO2 with the custom made triple-chain hydrocarbon surfactant TC14 (Figure 1a). The aim of this current proposal is to increase the levels of water incorporation by employing mixed TC14-commercial non-ionic surfactant systems. This represents a significant step forward in designing CO2-phillic hydrocarbon surfactants. The proposal is for a two day experiment using the ISIS Thar high-pressure cell.