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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

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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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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Van de Graaff Generator01:15

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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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Updated: Jan 21, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment.

Justin Boddison-Chouinard1, Ryan Plumadore1, Adina Luican-Mayer2

  • 1Department of Physics, University of Ottawa.

Journal of Visualized Experiments : Jove
|July 23, 2019
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Summary

Researchers developed a novel "hands-free" technique for precisely stacking 2D materials into van der Waals heterostructures. This method offers unprecedented control over both lateral positioning and angular alignment for advanced materials fabrication.

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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:

  • Van der Waals heterostructures are advanced materials formed by stacking distinct 2D materials.
  • Precise control over the stacking process, including layer alignment, is crucial for tailoring heterostructure properties.
  • Existing methods often lack the precision required for controlled assembly of complex heterostructures.

Purpose of the Study:

  • To present a novel, computer-controlled technique for fabricating van der Waals heterostructures.
  • To demonstrate precise control over both translational and angular alignment of stacked 2D materials.
  • To introduce a
  • hands-free
  • approach for remote and accurate heterostructure assembly.

Main Methods:

  • Development of a custom-built transfer setup with software-controlled stages for manipulating individual 2D crystals.
  • Achieving sub-micrometer translational and sub-degree angular precision during the crystal transfer process.
  • Implementation of a remote-controlled,
  • hands-free
  • operation for stacking 2D materials.

Main Results:

  • Successful demonstration of precise lateral positioning and angular alignment of adjacent 2D layers.
  • Creation of van der Waals heterostructures with controlled interlayer configurations.
  • Validation of the
  • hands-free
  • transfer technique for remote and accurate assembly.

Conclusions:

  • The developed technique enables precise and controlled fabrication of van der Waals heterostructures.
  • This advancement facilitates the creation of novel materials with tailored electronic and optical properties.
  • The
  • hands-free
  • approach offers a significant improvement in the assembly of complex 2D material-based devices.