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相关概念视频

Crown Ethers02:36

Crown Ethers

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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Network Covalent Solids02:18

Network Covalent Solids

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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.
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...
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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MO Theory and Covalent Bonding02:40

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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相关实验视频

Updated: Jun 13, 2025

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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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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聚酸共价有机框架

Ke Xu1, Robert Oestreich2, Takin Haj Hassani Sohi2

  • 1Department of Chemistry and Biology, Inorganic Materials Chemistry, University of Siegen, Adolf-Reichwein-Straße 2, Siegen, Germany.

Nature communications
|September 9, 2024
PubMed
概括
此摘要是机器生成的。

我们使用可持续的单步合成开发了稳定的多酸共价有机框架 (COFs). 这些微孔的COF在水和电解质中表现出极好的稳定性,具有捕获CO2的潜力.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学 化学 化学
  • 纳米技术 纳米技术

背景情况:

  • 联有机框架 (COF) 是具有多种应用的晶体多孔聚合物.
  • 开发稳定的COF,特别是用于水性或电化学环境,仍然是一个挑战.
  • 现有的合成方法往往涉及苛刻的试剂或多个步骤.

研究的目的:

  • 合成具有增强稳定性的新型聚酸共价有机框架 (COFs).
  • 探索一个可持续的,单步合成路径,用于COF建设.
  • 评估新开发的COF的稳定性和二氧化碳捕获能力.

主要方法:

  • 一个电荷辅助的联有机框架前体的单阶段凝结反应.
  • 将前体加热到210°C以上以诱导寡合化并形成无形微孔结构.
  • 固态双量子31P核磁共振光谱,以确认P-O-P键的形成.
  • 气体吸附测量以评估孔隙性和二氧化碳捕获.
  • 在水性电解质中测试电化学稳定性.

主要成果:

  • 通过可持续的,无试剂的加热方法成功合成了多酸COF.
  • 由此产生的COF表现出无形的微孔结构,具有稳定的P-O-P链接.
  • 证明了良好的水和水蒸气稳定性,以及在水性Na2SO4.4中的电化学稳定性.
  • 狭窄的毛孔有效地捕获二氧化碳 (CO2).

结论:

  • 开发的多酸COF为多孔材料提供了稳定和可持续的替代品.
  • 这些COF填补了水性和电化学系统中的应用的关键缺口.
  • 由于其孔隙结构和稳定性,这些材料对碳捕获技术具有前景.