期刊
CHEMICAL ENGINEERING JOURNAL
卷 307, 期 -, 页码 408-417出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.08.097
关键词
Pickering emulsions; ZIF-8; Yolk/shell structures; ZIF-8/alginate films; Microcapsules
资金
- National Natural Science Foundation of China [21476114]
- Natural Science Key Project of the Jiangsu Higher Education Institutions [12KJA530002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
We develop a facile method to fabricate yolk/shell and multi-yolk/shell ZIF-8/alginate hybrid microcapsules by first forming yolk/shell W/O ZIF-8 Pickering emulsions containing sodium alginate in water, followed by sodification of alginate to form the hybrid shell. Polymerization induced phase separation of a polyethylene glycol aqueous and acrylamide aqueous solution is used to form the yolk, and droplet coalescence is used to form multi-yolks. We examine the preparation conditions to obtain a stable ZIF-8 W/O Pickering emulsion. Further, these ZIF-8 Pickering emulsions can be converted to ZIF-8/alginate hybrid microcapsules with both hollow and yolk/shell structures by adding small amount of sodium alginate in the PEG solution, based on our finding that ZIF-8 can gelate sodium alginate. The ZIF-8/alginate hybrid microcapsules exhibit controlled release ability for Rhodamine B, with the yolk/shell one showing a lower dye release percentage. Furthermore, the release rate can be accelerated in an acid condition, resulting from the dissolution of ZIF-8. (C) 2016 Elsevier B.V. All rights reserved.
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