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Van der Waals Interactions01:24

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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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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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The ideal gas law is based on two simplifying assumptions: first, that there are no intermolecular attractions between gas molecules, and second, that the volume occupied by the molecules themselves is negligible compared with the volume of the container. However, these assumptions don't hold up under all conditions - specifically, at high pressures and low temperatures, as gas tends to deviate from ideal gas behavior.The van der Waals equation is an enhanced version of the ideal gas law,...
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Van der Waals Equation01:10

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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Electrically Tunable van der Waals Interaction in Graphene-Molecule Complex.

Manoharan Muruganathan1, Jian Sun1, Tomonori Imamura1

  • 1School of Materials Science, Japan Advanced Institute of Science and Technology , Nomi 923-1211, Japan.

Nano Letters
|November 13, 2015
PubMed
Summary

We demonstrate tunable van der Waals (vdW) interactions in graphene-CO2 complexes using electric fields. This allows control over molecule behavior on surfaces, opening new possibilities for surface chemistry applications.

Keywords:
electrical tunability of vdW interactionfield-dependent charge transfergraphene−molecule vdW complexesvan der Waals complex

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Van der Waals (vdW) interactions are crucial for surface physics and chemistry.
  • Modulating molecular interactions at atomic surfaces can be achieved by tuning charge fluctuations in vdW complexes.

Purpose of the Study:

  • To investigate the tunability of vdW interactions in graphene-CO2 complexes.
  • To explore the effect of external electric fields on CO2 adsorption and desorption on graphene.
  • To understand how electric fields modify charge transfer and molecular configuration.

Main Methods:

  • First-principles calculations using vdW density functionals.
  • Time evaluation measurements of CO2 adsorption/desorption on graphene.
  • Application of an external electric field to the graphene-CO2 system.

Main Results:

  • Demonstrated tunable vdW interactions in graphene-CO2 complexes.
  • Showcased field-dependent charge transfer, enabling CO2 to switch between acceptor and donor roles.
  • Observed modifications in adsorbed CO2 configuration, including equilibrium distance and O-C-O bonding angle.

Conclusions:

  • External electric fields provide a controllable method to tune vdW interactions.
  • The observed electrical tunability is specific to each molecule type.
  • This work offers insights into manipulating molecular behavior on surfaces via electrical control.