Research advances of preparation of Pickering emulsions and their stability
Pickering emulsion refers to an emulsion which is stabilized by ultrafine solid particles or solid colloidal particles instead of traditional surfactants.It is widely applied in many fields involving petroleum,water treatment,cosmetics,food,pharmacy and materials industries due to its advantages such as excellent stability,convenient regulation,environment protection and low cost.In view of preparation and stability of Pickering emulsions,the preparation methods of Pickering emulsions were reviewed systematically.Then,the pattern and research progress of solid emulsifier particles were sketched.Besides,the stability mechanism of Pickering emulsions were revealed.Furthermore,the influencing factors on stability of Pickering emulsions were analyzed.And then,the existing problems of Pickering emulsions were discussed.Finally,the development trends of Pickering emulsions were outlooked.In future,the progress of Pickering emulsion were mainly shown in the following three aspects.① The cheap,environment-friendly and reused Pickering emulsions with unmodified or modified natural solid nanoparticles were realized.③ The intelligent responsive Pickering emulsions(temperature,pH,magnetic and other response types)were applied in preparation of materials,slowly release or recovery of substance,catalytic reaction and so on.③ The structure of solid emulsifier particles and emulsions were accurately controlled,and the systemized theory of emulsions preparation was established through deeply investigating the stability mechanism of Pickering emulsions.