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liuxiang8868

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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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