![]() ![]() For CO 2-stimulated systems, a long time and high ventilation are needed. Pickering emulsions responding to dual triggers such as temperature–pH, CO 2–temperature, CO 2–magnetism, and redox–magnetism have been investigated. There is merit in combining two stimuli to widen the controllable range or improve the degree of precision. Under outside stimuli, stable Pickering emulsions can be phase separated because of the inactivation of the stabilizer. So far, the stimuli of the Pickering emulsions include pH, magnetism, CO 2, temperature, light irradiation, redox state, specific ion concentration, and so on. Recently, stimuli-responsive Pickering emulsions have received much attention. Thus, stimuli-responsive Pickering emulsions are desired in the above applications because the stability of the emulsions can be easily controlled by external stimuli. Chemical or physical methods are used in the industry to achieve demulsification, which are often energy-intensive or require extra complex additives, leading to increased economic and environmental costs. However, in some fields like heterogeneous catalysis, emulsion polymerization, and oil transportation and recovery, temporary stabilization is required. ![]() The outstanding stability of Pickering emulsions is required in the field of cosmetic formulations, food storage, and so on. Pickering emulsions, which were stabilized by solid particles, have gained much attention thanks to the low toxicity and long-term stability.
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