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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...
Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is bonded to two hydrogen atoms...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
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...
Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...

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Updated: Jun 24, 2026

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

Bulklike structures for medium-sized Al(n) (n=31-40) clusters.

Wei Zhang1, Wen-Cai Lu, Qing-Jun Zang

  • 1State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, Jilin 130021, People's Republic of China.

The Journal of Chemical Physics
|April 17, 2009
PubMed
Summary
This summary is machine-generated.

Researchers explored neutral aluminum clusters (Al31-Al40) using advanced computational methods. These medium-sized clusters adopt a stable, bulk-like stacking structure, offering insights into aluminum

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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Area of Science:

  • Computational materials science
  • Cluster physics
  • Solid-state chemistry

Background:

  • Understanding the structural properties of atomic clusters is crucial for materials science.
  • Aluminum clusters exhibit unique electronic and geometric structures that differ from bulk aluminum.

Purpose of the Study:

  • To determine the stable structures of neutral aluminum clusters with sizes ranging from 31 to 40 atoms.
  • To investigate the transition of cluster structures towards bulk-like arrangements.

Main Methods:

  • Employed a genetic algorithm (GA) coupled with tight-binding (TB) calculations for structural searching.
  • Utilized Density Functional Theory (DFT) with the Perdew-Burke-Ernzerhof (PBE) functional for accurate energy calculations.
  • Investigated both neutral and anion aluminum clusters.

Main Results:

  • Identified stable structures for neutral aluminum clusters Al(31) to Al(40).
  • Observed a transition to bulk-like stacking patterns in these medium-sized aluminum clusters.
  • Characterized the structural evolution with increasing cluster size.

Conclusions:

  • Medium-sized neutral aluminum clusters (Al31-Al40) favor bulk-like stacking arrangements.
  • The computational approach effectively predicts stable cluster structures.
  • Further studies on anion clusters can provide complementary insights.