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Doubly pH-Responsive Pickering Emulsion Emulsifiers with on/off properties have attracted attention recently becaue of their potential applications in heavy oil transportation,1 oil recovery,2 and emulsion polymerization.3 The surface activity of these emulsifiers can be well controlled, resulting in on/off switchability in response to stimuli such as CO2,3 pH,4 temperature,5 magnetic fields,6 metal ions,7 and redox changes.8 Currently, there is growing interest in developing stimulus-responsive particulate emulsifiers for Pickering emulsions because of their significant advantages over conventional surfactant systems, with special attention given to pH-responsive particulate emulsifiers. Hence, pH-responsive latexes,9 silica particles,10 hydroxyapatite particles,11 cross-linked micelles,12 layered double hydroxide particles,13 and others colloids have been explored for use as reversible emulsifiers. However, these pH-responsive emulsifiers usually require significant synthesis effort. Furthermore, practical applications such as heavy oil transportation and oil recovery require sizable quantities of stable, affordable, and nonhazardous emulsifiers. |
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