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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

13.4K
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...
13.4K
Intermolecular Forces03:13

Intermolecular Forces

57.8K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
57.8K
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

33.1K
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,...
33.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.2K
Metallic Solids02:37

Metallic Solids

18.3K
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....
18.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.7K

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関連する実験動画

Updated: Jun 10, 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

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溶媒誘発の大きな格子膨張を持つダイナミック二次元共性有機フレームワーク

Anastasiya Pratasouskaya1, Volodymyr Bon2, Alina Müller1

  • 1Faculty of Chemistry and Food Chemistry, TUD Dresden University of Technology, 01217 Dresden, Germany.

Journal of the American Chemical Society
|October 15, 2024
PubMed
まとめ

研究者は,溶媒に曝露すると最大85%まで膨張するダイナミックな二次元共性有機フレームワーク (2D COF) を開発しました. これらの適応性のある材料は,ガス分離とセンシングのアプリケーションに新しい可能性を秘めています.

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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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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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関連する実験動画

Last Updated: Jun 10, 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 and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • ダイナミック・コヴァレンント・オーガニック・フレームワーク (COF) は,ゲスト分子によって誘発される可逆的な相変遷を示し,ユニット細胞のパラメータと毛細さに影響を及ぼします.
  • 以前の研究では,3D COFの体積の変化が顕著であったが,2D COFは溶媒による体積の変化が限られていた.

研究 の 目的:

  • 溶媒による容量の変化を高める新しい2DCOFを設計し合成する.
  • 2D COFのダイナミックな振る舞いに対する相互接続ブリッジユニットの長さの影響を調査する.

主な方法:

  • 2D COF構造における相互接続の橋の長さの体系的な変化
  • 先進的な分析技術を用いた溶媒による構造変化と可逆性の特徴づけ

主要な成果:

  • 2D COFは,溶媒のない状態と比較して最大85%の溶媒誘発の体積膨張を示しています.
  • 結晶の秩序を維持しながら 構造変化の完全な可逆性を示した.
  • ダイナミックな2D COFの汎用的な設計戦略を確立しました.

結論:

  • 開発された2D COFは,制御可能なフレームワークの拡張における重要な進歩を表しています.
  • この設計戦略により,2D素材の可調性波紋性と体積の変化が可能になる.
  • ガス分離と化学センサーにおける潜在的な応用が強調されています.