CO2-switchable foams stabilized by a long-chain viscoelastic surfactant

Smart foams sensitive to external stimulation have gained increasing attention recently. However, reversibly switchable CO2 foams have been less documented. In this work, a novel kind of CO2-switchable foams was developed using a long-chain cationic surfactant, N-erucamidopropyl-N,N-dimethylammonium bicarbonate (UC22AMPM⋅H+), as both the foaming agent and stabilizer. The foams can be rapidly transformed between stable and unstable states at...