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Network Covalent Solids02:18

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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ケージベースの結晶共性有機フレームワーク

Jian-Xin Ma1,2, Jian Li3, Yi-Fan Chen4

  • 1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.

Journal of the American Chemical Society
|February 19, 2019
PubMed
まとめ
この要約は機械生成です。

研究者らは,CO2吸収のための恒久的多孔性を持つ新しいケージベースの結晶共性有機フレームワーク (COF) を開発した. このユニークな構造は2Dと3DのCOFを橋渡しし,多孔な有機ケージと拡張されたフレームワークを融合させます.

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科学分野:

  • 材料科学
  • 超分子化学
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) は,調節可能な構造を持つ結晶性多孔ポリマーである.
  • COFの新しいアーキテクチャの開発は,高度な材料のアプリケーションに不可欠です.
  • 毛細な有機ケージと 拡張されたフレームワークを 橋渡しすることで 新しいデザインの可能性が生まれます

研究 の 目的:

  • 新しいケージベースの結晶共性有機フレームワーク (COF) を構築する.
  • 合成されたケージ-COFの構造特性と多孔性を調査する.
  • これらの新しい材料のCO2吸収能力を評価する.

主な方法:

  • プリズマのような分子ケージとダイアミンリンクラーを使用してケージ-COF-1とケージ-COF-2の合成.
  • 13C CP/MAS NMRのようなテクニックを用いた構造的特徴付け.
  • CO2の吸収を中心に,多孔性とガスの吸収を測定する.

主要な成果:

  • 六角形の骨格で2つの新しいケージベースのCOF (ケージ-COF-1とケージ-COF-2) を合成しました.
  • このユニークな構造は 柱状のケージのノードと 吊るし付けのリンクを備えており 三角形のチャネルと 互いにつながった毛穴を作り出しています
  • ケージCOFは恒久的な多孔性を持ち,ケージ内部の空洞によって CO2が効果的に吸収されることが示されています.

結論:

  • 新しいケージ-COFは,2Dと3DのCOFの特徴を統合し,多孔な有機ケージと拡張された結晶有機フレームワークを橋渡しします.
  • これらの材料は永続的な多孔性を持ち,CO2キャプチャの応用の可能性を示しています.
  • この研究は,ユニークな構造と機能の特性を有する COF の新種を導入します.