CO₂-Triggered Pickering Emulsion Based on Silica Nanoparticles and Tertiary Amine with Long Hydrophobic Tails

We describe a strategy of fabricating CO2-triggered oil-in-water Pickering emulsion based on silica nanoparticles functionalized in situ by a trace amount of conventional CO2-switchable surfactant, N-(3-(dimethylamino)propyl)alkyl amide (CnPMA). By alternately bubbling CO2 and N2 at a moderate conditions (30 °C, 80 mL min-1), silica nanoparticles reversibly switch between amphipathic and hydrophilic as a result of the adsorption of ammonium...