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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

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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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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.
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 a. Second, the volume...
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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

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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Tunable van der Waals interactions in low-dimensional nanostructures.

Alberto Ambrosetti1, S Subashchandrabose1, B Liu1

  • 1Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, 35131 Padova, Italy.

The Journal of Chemical Physics
|July 9, 2021
PubMed
Summary

Researchers can tune nanoscale forces by altering mechanical strain and doping in carbyne-like chains and graphenic structures. This contrasts with traditional models, enabling precise control over nanomaterials and biological systems.

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Non-covalent van der Waals (vdW) interactions are crucial at the nanoscale.
  • Subtle changes in vdW interaction decay significantly impact surface phenomena, nanomaterial self-assembly, and biological systems.

Purpose of the Study:

  • To investigate the tunability of vdW interactions in coupled carbyne-like chains and graphenic structures.
  • To explore methods for controlling interfragment forces beyond conventional pairwise approximations.

Main Methods:

  • A full many-body description of vdW interactions was employed.
  • The study analyzed coupled carbyne-like chains and graphenic structures.
  • Mechanical strain and doping (polarizability change) were introduced as tuning parameters.

Main Results:

  • Both the modulus and range of interfragment forces were effectively tuned.
  • This tunability contrasts with pairwise vdW predictions, which fix asymptotic decay.
  • Demonstrated control over vdW interactions through mechanical and electronic means.

Conclusions:

  • The findings offer new pathways for experimental control of nanoscale systems.
  • Viable methods for manipulating static configurations and dynamic processes at the nanoscale are provided.
  • This work advances the understanding and application of vdW forces in nanomaterials and biological contexts.