There is a well-documented track record of research into water-in-CO2 (w/c) microemulsions. Using newly discovered CO2 compatible surfactants, the next step is to explore different self-assembly structures in CO2, with the aim of developing creative applications of CO2-based fluid technologies. The focus here is on viscosity modifiers for CO2. Three different strategies are being investigated to generate system-spanning networks: [1] Thread-like micelle (TLM) formation, [2] microemulsion based organogels (MBG¿s) and [3] low-molecular-mass organogelators (LMOG¿s). Promising results have already been obtained for approach [1] (Figure 1), and now a 3-day slot is required to further explore structure in these systems by high pressure SANS (HP-SANS).