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Related Concept Videos

Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
228
Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

12.0K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Strain-induced stacking transition in bilayer graphene.

Nina C Georgoulea1, Stephen R Power1,2, Nuala M Caffrey3,4

  • 1School of Physics, AMBER & CRANN Institute, Trinity College Dublin, Dublin 2, Ireland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Engineered strain in bilayer graphene (BLG) can alter its stacking. Above ~1% strain, one layer unstrains, transitioning to mixed stacking and offering an alternative to twistronics for novel phenomena.

Keywords:
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Strain engineering significantly impacts 2D and layered materials' properties.
  • Heterostrain in bilayer graphene (BLG) affects stacking and electronic structure.

Purpose of the Study:

  • Investigate the interplay between applied heterostrain and BLG stacking.
  • Determine strain transfer between layers and the critical strain for AB-stacking disruption.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Approximation using an infinite graphene sheet and an armchair graphene nanoribbon to bypass periodic boundary conditions.

Main Results:

  • A critical strain of approximately 1% was identified.
  • Above this threshold, the free layer favors being unstrained, leading to mixed stacking.
  • Findings align with energy models considering strain and stacking contributions.

Conclusions:

  • Small strain levels allow reversible engineering of stacking order and Moiré patterns in BLG.
  • This offers a potential alternative to twistronics for creating topological and exotic physical phenomena.