The proposal aims to explore water-in-CO2 (w/c) microemulsions with new, very promising hydrocarbon surfactants. The compounds are generated using standard chemistry1 but with one important modification: the hydrocarbon chains are based on a newly available highly branched alcohol (Figure 1c isostearyl alcohol). This iso unit has already been identified as very CO2 philic2, but this is the first time that it has been incorporated into a twin tailed surfactant. The surfactant and the surfactant blends proposed here represent new exciting approaches, and these high pressure SANS (HP-SANS) experiments are essential to investigate such advanced multi-component w/c formulations.