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

Abstract

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-CaCO3 was applied to fabricate stable [email protected]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-CaCO3 core. The structure, morphology, and properties of [email protected]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 [email protected]3 as particle emulsifier. The stable SCL bilayer on the CaCO3 surface brings variable surface affinity in response to Ca2+/pH/CO2 triple triggers, endowing the [email protected]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 [email protected]3 can be effectively applied in emulsion preparation–separation and drug delivery systems.