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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

66.9K
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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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Bewley Lattice Diagram01:12

Bewley Lattice Diagram

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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Coulomb's Law and The Principle of Superposition01:15

Coulomb's Law and The Principle of Superposition

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Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically?
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Updated: Sep 22, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Van der Waals superlattices.

Huaying Ren1, Zhong Wan1, Xiangfeng Duan1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, USA and.

National Science Review
|May 20, 2022
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Summary
This summary is machine-generated.

This perspective explores atomically thin van der Waals superlattices. It highlights their potential applications and future research directions in materials science.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Van der Waals (vdW) materials, like graphene and transition metal dichalcogenides, can be stacked to form heterostructures.
  • These vdW heterostructures exhibit unique electronic and optical properties distinct from their individual components.

Purpose of the Study:

  • To provide a perspective on the development of van der Waals superlattices.
  • To discuss the atomic-level manipulation and construction of these materials.
  • To outline potential applications and future research avenues for vdW superlattices.

Main Methods:

  • Atomic-level manipulation and precise stacking of 2D materials.
  • Fabrication of van der Waals heterostructures with controlled interfaces.
  • Characterization of the structural, electronic, and optical properties of the resulting superlattices.

Main Results:

  • Demonstration of the feasibility of constructing complex van der Waals superlattices.
  • Observation of emergent properties arising from the tailored stacking and interfaces.
  • Identification of promising avenues for device applications.

Conclusions:

  • Van der Waals superlattices represent a novel class of materials with tunable properties.
  • Precise atomic-level control enables the design of advanced functionalities.
  • Continued research in fabrication and characterization will unlock the full potential of these materials.