Synthesis and Characterization of Core-Shell Metal-Organic Framework (ZIF-67@ZIF-8) Particles
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- Fujiwara Atsushi
- Department of Chemical Engineering, Kyoto University
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- Watanabe Satoshi
- Department of Chemical Engineering, Kyoto University
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- T. Miyahara Minoru
- Department of Chemical Engineering, Kyoto University
Bibliographic Information
- Other Title
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- コアシェル型多孔性配位錯体粒子の合成と吸着特性評価
- コアシェルガタ タコウセイ ハイイ サクタイ リュウシ ノ ゴウセイ ト キュウチャク トクセイ ヒョウカ
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Abstract
<p>Zeolitic imidazolate frameworks (ZIFs) are a novel class of porous materials composed of metal ions and imidazole linkers. Here we focus on core-shell particles, where ZIF-67 core particles are covered with ZIF-8 shells (ZIF-67@ZIF-8). However, the synthesis of ZIF-67@ZIF-8 is generally difficult because the nucleation rate of ZIF-8 is so high that self-nucleation is unavoidable. In this study, we propose the following two approaches to overcome this challenge: (1) decreasing the nucleation rate by changing the water to methanol ratio used as solvents; and (2) intensifying the mixing during the synthesis by using a microreactor. Our experiments demonstrated that an increase in the water ratio suppresses the self-nucleation of the ZIF-8 particles, whereas surfaces of the resultant ZIF-67@ZIF-8 particles become irregular. The ZIF-67@ZIF-8 particles with uneven surfaces experienced an approximately 14% decrease in the adsorption amount as compared with that of the ZIF-67 particles. In contrast, the microreactor successfully produced ZIF-67@ZIF-8 particles with a smooth surface and high surface area. Our study revealed that intensive mixing is key to obtain uniform core-shell particles.</p>
Journal
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- Journal of the Society of Powder Technology, Japan
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Journal of the Society of Powder Technology, Japan 56 (4), 181-186, 2019-04-10
The Society of Powder Technology, Japan
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Details
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- CRID
- 1390282763109958784
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- NII Article ID
- 130007633969
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- NII Book ID
- AN00222757
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- ISSN
- 18837239
- 03866157
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- NDL BIB ID
- 029669131
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed