Self-crosslinked admicelle of sodium conjugated linoleate@nano-CaCO3 and its stimuli–response to Ca2+/pH/CO2 triple triggers

Adsorption of fatty acids and soaps on solid surfaces is widely-used to modify solids but easy to be desorbed and forming soap scum in acidic and hard water. The admicelle of sodium conjugated linoleate (ASCL) on nano-CaCO 3 was applied to fabricate stable ASCL@CaCO 3 , via SCL bilayer adsorption followed by simple thermo-curing the conjugated double bonds of SCL within an admicelle to anchor the admicelle around a nano-CaCO 3 core. The structure, morphology, and properties of ASCL@CaCO 3 were characterized by FT-IR, UV, TG, TEM, and contact angle measurements. High internal phase Pickering emulsions of liquid paraffin in water with oil volume fractions up to 80% could be stabilized with 1 wt% of the ASCL@CaCO 3 as particle emulsifier . The stable SCL bilayer on the CaCO 3 surface brings variable surface affinity in response to Ca 2+ /pH/CO 2 triple triggers, endowing the ASCL@CaCO 3 to stabilize high internal phase emulsions, switch on/off Pickering emulsions, and even lead to emulsion inversion. Therefore, the triple stimuli-responsive properties of the ASCL@CaCO 3 can be effectively applied in emulsion preparation–separation and drug delivery systems.