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相关概念视频

Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.2K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.2K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

17.9K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
17.9K
Newman Projections02:06

Newman Projections

20.3K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
20.3K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.3K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.3K
Network Covalent Solids02:18

Network Covalent Solids

16.0K
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...
16.0K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

73.9K
Dipole Moment of a Molecule
73.9K

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Updated: Jan 15, 2026

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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可逆形状记忆二维共价有机框架

Mingchao Shao1,2, Jinyang Chen1,3, Wenqiang Gao1,4

  • 1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, PR China.

Nature communications
|October 10, 2025
PubMed
概括
此摘要是机器生成的。

形状记忆二维共价有机框架显示可逆堆叠阶段和可调节的孔径大小. 这一突破使得对透性的动态控制和对先进应用的智能响应成为可能.

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科学领域:

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

背景情况:

  • 二维共价有机框架 (2DCOFs) 具有独特的特性,如纳米通道和可调节的孔径大小.
  • 2DCOF中的可逆堆叠相对于纳米电子,纳米反应器和气体分离的应用至关重要.
  • 在稳定的滑动AA阶段之外,实现可控制的可逆堆叠仍然是一个重大挑战.

研究的目的:

  • 设计具有形状记忆特性和可逆层间堆叠序列的2DCOF.
  • 探索刺激反应机制,以控制2DCOF中的毛孔大小和环境.
  • 为了证明这些材料在动态调节的透性和智能响应系统中的潜力.

主要方法:

  • 设计用于可逆堆叠的2DCOFs的合成.
  • 诱导不同的堆叠阶段 (AA和倾斜) 使用受控的条件,如"热冰"的形成.
  • 在封闭的纳米通道内吸附分子 (例如,四二),以影响层间相互作用.

主要成果:

  • 成功实现了具有可切换层间堆叠的形状记忆2DCOF.
  • 证明"热冰"会诱导AA堆叠,而吸附的四氨酸会诱导倾斜堆叠.
  • 在2DCOF纳米通道中展示了孔径大小和环境的可逆变化.

结论:

  • 开发的2DCOF形状记忆器为动态孔径大小和环境控制提供了一个新的平台.
  • 这些材料具有可调节的透性,为智能响应系统铺平了道路.
  • 这些发现为未来纳米电子,纳米反应器和分离技术的进步带来了巨大的潜力.