Viscoelastic diamine surfactant for stable carbon dioxide/water foams over a wide range in salinity and temperature.

Hypothesis: The viscosity and stability of CO/water foams at elevated temperature can be increased significantly with highly viscoelastic aqueous lamellae. The slow thinning of these viscoelastic lamellae leads to greater foam stability upon slowing down Ostwald ripening and coalescence. In the aqueous phase, the viscoelasticity may be increased by increasing the surfactant tail length to form more entangled micelles even at high temperatures and salinity.