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Related Concept Videos

Van der Waals Equation01:10

Van der Waals Equation

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

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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. 
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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...
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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

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Updated: May 21, 2025

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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Three-dimensional van der Waals open frameworks.

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
Summary
This summary is machine-generated.

Researchers developed novel van der Waals open frameworks (WaaFs) using large metal-organic polyhedra. These robust WaaFs demonstrate high stability and porosity, challenging previous beliefs about non-covalent interactions in material construction.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Open-framework materials typically rely on strong bonds for structural integrity.
  • Non-covalent interactions are generally considered too weak to form stable, porous frameworks.
  • Existing methods face limitations in creating robust materials with large voids.

Purpose of the Study:

  • To demonstrate the feasibility of constructing stable open-framework materials using van der Waals interactions.
  • To introduce van der Waals open frameworks (WaaFs) as a new class of porous materials.
  • To investigate the role of large building blocks in achieving robust framework assembly.

Main Methods:

  • Synthesis of large ( > 2 nm) octahedral metal-organic polyhedra.
  • Assembly of these polyhedra into a diamond network structure.
  • Characterization of framework stability, porosity, and interaction energies.

Main Results:

  • Successful construction of robust three-dimensional van der Waals open frameworks (WaaFs).
  • Achieved high extrinsic porosity due to sparse diamond network packing.
  • Demonstrated high thermal stability and specific surface area.
  • Quantified strong van der Waals interactions (> 400 kJ/mol) facilitated by large, well-defined polyhedra faces.
  • Observed reversible framework assembly.

Conclusions:

  • Van der Waals interactions can effectively stabilize robust open-framework materials.
  • Large metal-organic polyhedra are crucial building blocks for WaaF synthesis.
  • WaaFs represent a promising new platform for porous materials with tunable properties.