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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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...
¹H NMR: Complex Splitting01:13

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Published on: July 18, 2025

AC/AB stacking boundaries in bilayer graphene.

Junhao Lin1, Wenjing Fang, Wu Zhou

  • 1Department of Physics and Astronomy, Vanderbilt University , Nashville, Tennessee 37235, United States.

Nano Letters
|June 19, 2013
PubMed
Summary
This summary is machine-generated.

Boundaries in bilayer graphene, specifically AB/AC stacking domains, are nanometer-wide strained channels. These ripples create smooth, low-energy transitions, offering new insights for 2D materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Material properties are significantly influenced by various boundaries, such as phase, grain, and domain boundaries.
  • Understanding these boundaries is crucial for predicting and controlling material behavior.

Purpose of the Study:

  • To investigate the nature of boundaries between AB and AC stacking domains in bilayer graphene.
  • To characterize the structural and energetic properties of these stacking boundaries.

Main Methods:

  • Combined dark-field (DF) transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) imaging.
  • Utilized density functional theory (DFT) and classical molecular dynamics (MD) calculations.

Main Results:

  • Identified AB/AC stacking boundaries in bilayer graphene as nanometer-wide strained channels.
  • Demonstrated that these boundaries predominantly manifest as ripples.
  • Showcased that these ripple structures facilitate smooth, low-energy transitions between stacking domains.

Conclusions:

  • Bilayer graphene stacking boundaries are characterized by strained ripple channels, providing a novel understanding of their structure and energy landscape.
  • These findings offer potential applications for designing and manipulating other layered two-dimensional materials.