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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

15.3K
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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
15.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.0K
Metallic Solids02:37

Metallic Solids

19.8K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.8K
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

36.6K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
36.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

18.9K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
18.9K
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

41.4K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
41.4K

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関連する実験動画

Updated: Nov 7, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.7K

二次元共性有機フレームワーク 固体溶液

Rebecca L Li1, Anna Yang1, Nathan C Flanders1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208 United States.

Journal of the American Chemical Society
|April 28, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は,モノメアの混合物を用いて新しい共性有機フレームワーク (COF) を作成した. この突破は,固体溶液におけるモノメアの比率を調整することによって,孔の大きさなどのCOFの性質を継続的に調整することを可能にします.

さらに関連する動画

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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関連する実験動画

Last Updated: Nov 7, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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科学分野:

  • 材料科学
  • ポリマー化学
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) は,通常,高対称性構造のために制限されたモノマーを使用します.
  • 複数のモノマーでCOFを合成すると,統計的分布または低対称性が生じる.

研究 の 目的:

  • 単相二次元COFの固体溶液の形成を,異なる長さのモノマー混合物から実証する.
  • 調整可能な性質を持つ複雑なCOFを設計するための新しい戦略を探求する.

主な方法:

  • モノマー混合物のポリメリゼーション
  • X線微分法,フーリエ変換赤外線光譜法,パウリー精錬を用いた特徴化.

主要な成果:

  • 連続して変化する格子パラメータを持つ単相六角二次元COF固体溶液の形成.
  • 同じ格子内のモノメアのランダムな分布は,微分とスペクトロスコーピで確認された.
  • 非線形格子パラメータの変化によって示される,異なる長さのモノマーを収納する結合曲線の証拠.

結論:

  • 固体溶液形成は,2D COFを高度に設計するための新しい経路を提供します.
  • 調節可能なモノマー組成は,平均孔径サイズなどのCOF特性を継続的に制御することができます.
  • 混合物の直接的ポリメリゼーションは効果的であり,合成後のリンカー交換は固体溶液形成に適していません.