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Multiple Pickering emulsions stabilized by surface-segregated micelles with adaptive wettability
Tongtong Zhang1, Hang Jiang2, Liangzhi Hong1,3
1Faculty of Materials Science and Engineering, South China University of Technology Guangzhou 510640 P. R. China mslzhong@scut.edu.cn.
Chemical Science
|November 2, 2022
Summary
Surface-segregated micelles with adaptive wettability enable pH-controlled creation of multiple emulsions for efficient interfacial catalysis. These systems offer enhanced reaction rates in recyclable microreactors.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Catalysis
Background:
- Surface-segregated micelles (SSMs) offer tunable properties for advanced applications.
- Adaptive wettability is crucial for controlling interfacial phenomena in emulsions.
- Pickering emulsions and bioanalytical technologies benefit from stable emulsifier systems.
Purpose of the Study:
- To synthesize spherical SSMs with adaptive wettability using a binary mixture of macromolecular chain transfer agents.
- To demonstrate the ability of these SSMs to form both water-in-oil-in-water (W/O/W) and oil-in-water-in-oil (O/W/O) multiple emulsions via pH adjustment.
- To explore the utility of pH-responsive multiple emulsions as efficient and recyclable interfacial catalytic systems.
Main Methods:
- Polymerization-induced self-assembly (PISA) using pH-responsive poly(2-(dimethylamino) ethyl methacrylate) and hydrophobic polydimethylsiloxane.
- Single-step emulsification process controlled by pH adjustment.
- Characterization of multiple emulsion formation and stability.
- Evaluation of catalytic efficiency in multiple emulsion microreactors.
Main Results:
- Spherical SSMs with adaptive wettability were successfully synthesized.
- Both W/O/W and O/W/O multiple emulsions were produced in a single step by controlling pH.
- The multiple emulsion systems demonstrated suitability for interfacial catalysis.
- Increased oil-water interface area in microreactors led to enhanced catalytic efficiency compared to conventional emulsions.
Conclusions:
- pH-responsive SSMs are effective emulsifiers for creating tunable multiple emulsions.
- The developed multiple emulsion systems provide a platform for efficient and recyclable interfacial catalysis.
- Adaptive wettability and controlled interfacial area are key factors for advanced emulsion-based catalytic applications.
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