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j.cej.2012.08.065.pdf | 1.13 MB | Adobe PDF | 見る/開く |
タイトル: | Synthesis and adsorption properties of ZIF-8 nanoparticles using a micromixer |
著者: | Yamamoto, Daigo Maki, Taisuke https://orcid.org/0000-0001-8656-383X (unconfirmed) Watanabe, Satoshi https://orcid.org/0000-0002-5058-4337 (unconfirmed) Tanaka, Hideki Miyahara, Minoru T. https://orcid.org/0000-0001-8883-5851 (unconfirmed) Mae, Kazuhiro |
著者名の別形: | 前, 一廣 |
キーワード: | Porous coordination polymers Metal organic frameworks Nanoparticles Adsorption Micromixer |
発行日: | 1-Jul-2013 |
出版者: | Elsevier B.V. |
誌名: | Chemical Engineering Journal |
巻: | 227 |
開始ページ: | 145 |
終了ページ: | 150 |
抄録: | We synthesized size-controlled zeolitic imidazolate framework (ZIF-8) nanoparticles using a T-type micromixer. The nanocrystallization of ZIF-8 proceeds by a rapid coordination reaction of Zn^{2+} ions and 2-methylimidazole (2-MeIM) in a highly concentrated solution. Therefore, a rapid mixing of the raw materials is required to control the size and morphology of ZIF-8 nanoparticles. First, we prepared ZIF-8 nanoparticles at various flow rates of raw materials to investigate the mixing performance of a T-type micromixer. The size of the ZIF-8 nanoparticles decreased with an increase in flow rates at Reynolds number (Re) < 2000 (regarded as laminar flow). However, the size and shape of the resultant nanoparticles did not depend on the flow rates at Re > 2000 (transition state between laminar flow and turbulent flow), demonstrating the high mixing performance. Further, we systematically examined the effects of temperatures and [2-MeIM]/[Zn^{2+}] ratios on the resultant ZIF-8 nanoparticles to elucidate the formation mechanism and to optimize the conditions for the synthesis of smaller ZIF-8 nanoparticles. Through a detailed analysis, we concluded that the requisite conditions for the preparation of smaller ZIF-8 nanoparticles are lower temperatures and higher [2-MeIM]/[Zn^{2+}] ratios, which affect the nucleation process and the particle growth process, respectively. Finally, we examined the adsorption properties of the resultant smaller ZIF-8 nanoparticles. We found that the amount of adsorbed N2 gas for the ZIF-8 nanoparticles synthesized by our method is higher than the amount for a conventional ZIF-8 sample, and the adsorption rate is faster because of the nanocrystallization. |
著作権等: | © 2012 Elsevier B.V. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/176334 |
DOI(出版社版): | 10.1016/j.cej.2012.08.065 |
出現コレクション: | 学術雑誌掲載論文等 |
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