pH-responsible Pickering emulsion and its catalytic application for reaction at water–oil interface
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- 作者：Zhihui Fang ; Duanguang Yang ; Yong Gao ; Huaming Li
- 关键词：Pickering emulsions ; Hybrid micelles ; pH ; responsible ; Interface catalysis
- 刊名：Colloid & Polymer Science
- 出版年：2015
- 出版时间：May 2015
- 年：2015
- 卷：293
- 期：5
- 页码：1505-1513
- 全文大小：1,165 KB
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28.Okada M, Maeda H, Fujii S, Nakamura Y, Furuzono - 作者单位：Zhihui Fang (1)
Duanguang Yang (1)
Yong Gao (1)
Huaming Li (1) (2)
1. College of Chemistry, Xiangtan University, Xiangtan, People’s Republic of China
2. Key Lab of Environment Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, People’s Republic of China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Polymer Sciences
Physical Chemistry
Soft Matter and Complex Fluids
Characterization and Evaluation Materials
Food Science - 出版者：Springer Berlin / Heidelberg
- ISSN：1435-1536
文摘
In this work, pH-responsible Pickering emulsion stabilized by polymer-metal hybrid micelles and its catalytic?application for reaction?at oil–water interface?were presented. Employing Au@poly(ethylene oxide)-b-poly(4-vinylpyridine) polymer-metal hybrid micelles as emulsifier, n-decanol in water Pickering emulsion was first generated. The produced Pickering emulsion displayed reversible emulsification/demulsification with pH variation of the water phase, and this pH-induced emulsification/demulsification could undergo multiple cycles with only a slight reduction in emulsion performance. Dynamic light scattering, zeta potential measurement, and interfacial tension measurement, as well as transmission electron microscopy characterization, all showed that this reversible emulsification/demulsification cycle was the result of the tunable wettabilities of the core cross-linked hybrid emulsifier micelles with pH variation. Benefited from the excellent catalytic performances of the implanted Au nanoparticles at the oil–water interface and the large interfacial area of the emulsion droplets together with the pH-responsible reversible emulsification/demulsification cycle, the generated Pickering emulsion could readily applied as a catalytic microreactor for a broad of organic reactions occurred in water medium. As a proof of the concept, Au catalyzed reduction reaction of p-nitroanisole by NaBH4 was investigated. The catalyst showed both a highly catalytic activity? with a good recyclability.