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Related Concept Videos

Van der Waals Equation01:10

Van der Waals Equation

4.7K
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...
4.7K
Van der Waals Interactions01:24

Van der Waals Interactions

67.1K
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.
67.1K

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Related Experiment Video

Updated: Sep 30, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Graphene-based SiC Van der Waals heterostructures: nonequilibrium molecular dynamics simulation study.

F Z Zanane1, K Sadki2,3, L B Drissi4,5,6

  • 1LPHE, Modeling & Simulations, Faculty of Science, Mohammed V University in Rabat, MB 1014 RP, Rabat, Morocco.

Journal of Molecular Modeling
|March 10, 2022
PubMed
Summary

Graphene-based SiC heterostructures exhibit tunable thermal conductivity influenced by structural properties and defects. These materials show promise for thermoelectric applications due to their unique thermal behaviors.

Keywords:
Phonon Umklapp scatteringReverse nonequilibrium molecular dynamicsStructural stabilityThermal conductivityVan der Waals heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene-based silicon carbide (SiC) heterostructures are advanced materials with potential applications in electronics and energy.
  • Understanding their thermal properties is crucial for optimizing device performance.

Purpose of the Study:

  • To investigate the structural properties and thermal conductivity of graphene-based SiC heterostructures.
  • To analyze the influence of temperature, structural orientation, and vacancies on thermal conductivity.
  • To evaluate the potential of these heterostructures for thermoelectric applications.

Main Methods:

  • Reverse nonequilibrium molecular dynamics simulations were employed.
  • Cohesive energy and thermal conductivity were calculated.
  • The effects of temperature, structural parameters (length, orientation), and different types of vacancies (point, bi-vacancy, edge) were examined.

Main Results:

  • The C/SiC/C heterostructure exhibited the highest cohesive energy due to van der Waals interactions.
  • Surface rippling was observed around 400 K.
  • Thermal conductivity (κ) increased with length and specific orientations (armchair, zigzag) but decreased with rising temperature due to phonon scattering.
  • Vacancies, particularly point vacancies, significantly reduced thermal conductivity by localizing low-frequency phonons.

Conclusions:

  • Pristine and defective graphene-based SiC heterostructures possess tunable thermal conductivity.
  • These materials are promising candidates for thermoelectric devices with adjustable functionalities.