2つの無孔ポリモルフと高表面積の有孔フェーズを可逆的に切り替える調整ネットワーク
Ai-Xin Zhu1,2, Qing-Yuan Yang2,3, Amrit Kumar2
1Faculty of Chemistry and Chemical Engineering , Yunnan Normal University , Kunming 650500 , China.
Journal of the American Chemical Society
|November 6, 2018
まとめ
新しい金属有機構造体X-pcu-5-Znは,開いた状態と閉じた状態の間の可逆的な切り替えを示し,ガス貯蔵のための高CO2吸収を可能にします. この素材は
科学分野:
- 材料科学
- 化学について
- ナノテクノロジー
背景:
- メタル・オーガニック・フレームワーク (MOF) はガスの貯蔵に有望である.
- スイッチ可能なMOFは,多孔性に対するダイナミックな制御を提供します.
- MOFのフェーズトランジションを理解することは,アプリケーションにとって極めて重要です.
研究 の 目的:
- X-pcu-5-Znという新しい相互浸透した原始立方体 (pcu) ネットワークを合成し,特徴づけること.
- X-pcu-5-Znの可逆的な相切り行動について調べるため
- X-pcu-5-Znのガス吸収特性と潜在的な応用を探求する.
主な方法:
- X-pcu-5-Znの溶熱合成
- ガス吸収分析 (CO2吸収 195 K)
- ポリモルフの構造的特徴化のための単結晶X線 difraktion.
主要な成果:
- X-pcu-5-Znという2重の相互浸透したpcuネットワークが合成されました.
- X-pcu-5-Znは,開いた (α) と閉じた (β, γ) ポリモルフの間の可逆的な切り替えを示す.
- α形は,F-IV型イソサームによる高CO2吸収量 (195Kで255cm3/g) を示しています.
- βポリモルフは,CO2負荷のα形態を活性化して分離され,サイクルを通して持続します.
- 段階の変化は単結晶から単結晶へと発生した.
結論:
- X-pcu-5-Znは高CO2吸収と可逆的なスイッチングのユニークな組み合わせを示しています.
- ガス活性化による新しいポリモルフの分離は前例のないものです.
- 単結晶から単結晶への相移行は,ダイナミックなMOFの構造的な理解を容易にする.
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