The proposal aims to explore the oil-in-water (brine) high internal phase emulsion systems (HIPEs) formed by nonylphenol ethoxylate surfactants using contrast variation SANS (CV-SANS). This follows recent experiments with analogous nonylphenol ethoxylate stabilized HIPEs in dense CO2 (scCO2), which lead to enhanced viscosity of the supercritical fluid. Studies of behaviour and properties of analogous HIPEs in bench-top accessible systems using liquid hydrocarbon oil (dodecane) are critical for optimizing scCO2 emulsions. This is part of a collaboration with the University of Pittsburgh, funded by the UK EPSRC through a Next Generation Facility User grant ¿Neutron scattering studies of CO2-based gels¿ (EP/F020686 the PhD is co-investigator SC), and the US Department of Energy (US-DOE) ¿Novel Surfactant Based Concepts for Improved Mobility Control of CO2 Floods¿ (NETL IAES 8.2.8.2.14).