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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

73.0K
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.
73.0K
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

39.9K
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.
39.9K
The Van der Waals Equation01:26

The Van der Waals Equation

95
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

Van der Waals Equation

6.8K
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...
6.8K
Intermolecular Forces03:13

Intermolecular Forces

76.5K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Intermolecular Forces03:13

Intermolecular Forces

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Related Experiment Video

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Van der Waals pressure and its effect on trapped interlayer molecules.

K S Vasu1, E Prestat2, J Abraham1

  • 1School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.

Nature Communications
|July 8, 2016
PubMed
Summary

Two-dimensional crystal assembly creates high interfacial pressures, up to 1.2 GPa, capable of inducing chemical reactions and forming novel oxide materials. This phenomenon is crucial for understanding van der Waals heterostructures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Van der Waals assembly of 2D crystals enables novel material design.
  • Trapping molecules between 2D crystals can generate significant interfacial pressure.
  • Previous predictions suggested pressures could reach 1 GPa.

Purpose of the Study:

  • To experimentally measure the interfacial pressure generated by trapped molecules between 2D crystals.
  • To investigate the effects of this high pressure on molecular structure, conformation, and chemical reactivity.
  • To explore the potential applications of this pressure in materials modification.

Main Methods:

  • Utilized pressure-sensitive molecules to probe interfacial pressure.
  • Employed Raman spectrometry to analyze molecular structural and conformational changes.
  • Investigated chemical reactions induced by the confined pressure.

Main Results:

  • Measured interfacial pressures of 1.2 ± 0.3 GPa for 1-nm thick molecular layers.
  • Observed that high pressure induces chemical reactions, such as salt-water reactions at room temperature.
  • Demonstrated the formation of 2D oxide crystals from trapped salts.

Conclusions:

  • The interfacial pressure in van der Waals heterostructures is significant and measurable.
  • This pressure can induce chemical transformations and create new materials.
  • Understanding and exploiting this interfacial pressure is vital for 2D materials research and applications.