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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

68.5K
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

5.1K
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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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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

37.0K
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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Newman Projections02:06

Newman Projections

19.3K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
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Related Experiment Video

Updated: Nov 10, 2025

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
04:57

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

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Van der Waals interaction affects wrinkle formation in two-dimensional materials.

Pablo Ares1,2, Yi Bo Wang3,2, Colin R Woods3,2

  • 1Department of Physics and Astronomy, University of Manchester, M13 9PL Manchester, United Kingdom; pableras.ares@gmail.com bdavidov@umass.edu kostya@nus.edu.sg.

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 2021
PubMed
Summary
This summary is machine-generated.

Radially oriented wrinkles in 2D vdW heterostructures reveal instabilities. Their pattern formation depends on membrane bending resistance and van der Waals attraction, offering insights into material properties.

Keywords:
grapheneinstabilitiesvan der Waals heterostructures

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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:

  • Solid mechanics
  • Materials science
  • Condensed matter physics

Background:

  • Nonlinear mechanics of solids involves complex patterns and applications.
  • Two-dimensional (2D) crystals and van der Waals (vdW) heterostructures offer atomic-level control and interpretation.
  • Understanding instabilities in these materials is crucial for advanced applications.

Purpose of the Study:

  • To investigate the formation of radial wrinkles around bubbles in 2D vdW heterostructures.
  • To explore the relationship between wrinkle patterns and material properties.
  • To analyze the influence of interface structure and layer thickness on instabilities.

Main Methods:

  • Utilizing the classical "Winkler foundation" model from elasticity theory.
  • Analyzing the energetic balance between membrane bending resistance and vdW attraction.
  • Correlating the number of radial wrinkles with bending rigidity and vdW interaction strength.

Main Results:

  • Wrinkle shape and wavelength are influenced by 2D crystal thickness and interface atomistic structure.
  • Periodic wrinkle patterns arise from a balance between bending resistance and vdW attraction.
  • Bending rigidity shows a nontrivial, layer-dependent behavior, with two distinct regimes.

Conclusions:

  • The number of radial wrinkles provides a quantitative link between bending rigidity and vdW interaction.
  • The study demonstrates layer-dependent bending rigidity in 2D materials.
  • vdW forces exhibit high sensitivity to the relative alignment of substrate and membrane.