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Related Concept Videos

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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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

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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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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Metallic Solids02:37

Metallic Solids

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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....
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Shape-Anisotropy-Induced Ordered Packings in Cylindrical Confinement.

Weiwei Jin1, Ho-Kei Chan1, Zheng Zhong1

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Physical Review Letters
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Researchers simulated densest spheroid packings in cylinders, discovering new crystalline structures. Findings reveal transitions between chiral and orientational ordering, guiding the creation of crystalline wires from anisotropic particles.

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Area of Science:

  • Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding particle packing is crucial for materials science.
  • Cylindrical confinement influences particle arrangement.
  • Anisotropic particle shapes introduce complex ordering phenomena.

Purpose of the Study:

  • To determine the densest possible packings of identical spheroids within cylindrical confinement.
  • To explore the impact of shape anisotropy and confinement ratio on packing structures.
  • To identify transitions between different ordering mechanisms.

Main Methods:

  • Utilized Monte Carlo simulations to model spheroid packing.
  • Varied spheroid shape anisotropy and cylinder-to-spheroid size ratios.
  • Analyzed resulting crystalline structures for order and symmetry.

Main Results:

  • Discovered diverse densest crystalline structures, including achiral and chiral helical arrangements.
  • Observed confinement-induced chiral ordering.
  • Identified shape-anisotropy-induced orientational ordering.

Conclusions:

  • A transition exists between confinement-induced chiral ordering and shape-anisotropy-induced orientational ordering.
  • The study provides a guide for fabricating crystalline wires using anisotropic particles.
  • Simulation results offer insights into self-assembly processes in confined geometries.