Journal
LANGMUIR
Volume 30, Issue 34, Pages 10248-10255Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la502749x
Keywords
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Funding
- National Natural Science Foundation of China [21376211, 20976153, 20936006]
- Chinese State Key Laboratory of Chemical Engineering at Zhejiang University [SKL-ChE-12T05, SKL-ChE-11D02, SKL-ChE-14D01]
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Cross-linked polymer particles were prepared via surfactant-free emulsion copolymerization of 2-(diethylamino)-ethyl methacrylate (DEAEMA) and sodium methacrylate (SMA) using N,N'-methylenebis(acrylamide) (MBA) as a cross-linker. Generated particles are zwitterionic, possessing unique isoelectric points in the pH range of 7.5-8.0, which is readily tunable through CO2/N-2 bubbling. The particles were found to be highly responsive to CO2/N-2 switching, dissolving in water with CO2 bubbling and precipitating with N-2 bubbling at room temperature. Pickering emulsions of n-dodecane were prepared using these particles as the sole emulsifier. These emulsions can be rapidly demulsified with CO2 bubbling, resulting in complete oil/water phase separations. Nitrogen bubbling efficiently re-emulsifies the oil with the aid of homogenization. The rapid emulsification/demulsification using CO2/N-2 bubbling at room temperature provides these cross-linked zwitterionic particles with distinct advantages as functional Pickering surfactants.
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