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相关概念视频

Van der Waals Equation01:10

Van der Waals Equation

3.9K
The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient...
3.9K
Van der Waals Interactions01:24

Van der Waals Interactions

63.1K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
63.1K
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

34.3K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws. 
34.3K
Three-Dimensional Force System01:30

Three-Dimensional Force System

1.9K
In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
1.9K
VSEPR Theory02:37

VSEPR Theory

8.8K
Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

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Overview of VSEPR Theory
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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三维的范德瓦尔斯开放框架

Shun Tokuda1,2, Shuhei Furukawa3,4

  • 1Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto, Japan. s.tokuda@fkf.mpg.de.

Nature chemistry
|March 19, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用大型金属有机多面体开发了新的范德瓦尔斯开放框架 (WaaFs). 这些强大的WaAF表现出高稳定性和多孔性,挑战了以前关于材料构造中的非共价相互作用的信念.

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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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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 纳米技术纳米技术

背景情况:

  • 开放框架材料通常依赖于强大的结构完整性的纽带.
  • 非共价相互作用通常被认为太弱,无法形成稳定,多孔的框架.
  • 现有的方法在制造具有大空隙的坚固材料方面存在局限性.

研究的目的:

  • 为了证明使用范德瓦尔斯相互作用构建稳定的开放框架材料的可行性.
  • 引入范德瓦尔斯开放框架 (WaaFs) 作为一种新类型的多孔材料.
  • 调查大型构建块在实现强大的框架组装中的作用.

主要方法:

  • 大 (> 2 nm) 八面体金属有机多面体的合成.
  • 这些多面体组合成一个钻石网络结构.
  • 框架稳定性,孔隙性和相互作用能量的表征.

主要成果:

  • 成功建造了坚固的三维范德瓦尔斯开放框架 (WaaFs).
  • 由于稀疏的钻石网络包装,实现了高的外部孔隙性.
  • 证明了高热稳定性和特定表面积.
  • 量化强的范德瓦尔斯相互作用 (> 400 kJ/mol) 由大而明确的多面体面部促进.
  • 观察到可逆框架组件.

结论:

  • 范德瓦尔斯相互作用可以有效地稳定强大的开放框架材料.
  • 大型金属有机多面体是WaaF合成的关键组成部分.
  • WaaFs代表了一个有前途的新平台,用于具有可调节性质的多孔材料.