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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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...
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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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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...
13.8K
Unit Cells01:18

Unit Cells

126
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Templated quasicrystalline molecular ordering.

J A Smerdon1, K M Young, M Lowe

  • 1Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy, University of Central Lancashire , Fylde Rd, Preston, Lancashire PR1 2HE, United Kingdom.

Nano Letters
|February 18, 2014
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Summary
This summary is machine-generated.

Researchers observed quasicrystalline molecular layers on quasicrystal surfaces. Molecules formed ordered patterns, demonstrating quasicrystalline ordering on a template for the first time.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Quasicrystals possess long-range order without periodic atomic arrangements.
  • Controlling molecular assembly on complex surfaces remains a challenge.

Purpose of the Study:

  • To investigate the formation of quasicrystalline molecular layers on quasicrystal surfaces.
  • To demonstrate molecular ordering templated by quasicrystalline substrates.

Main Methods:

  • Scanning tunneling microscopy (STM) was employed to observe molecular arrangements.
  • Specific quasicrystal surfaces, including icosahedral Al-Cu-Fe and Ag-In-Yb, were used as templates.

Main Results:

  • Carbon-60 (C60) molecules formed a quasicrystalline lattice on Al-Cu-Fe by adsorbing on iron atoms.
  • Pentacene (Pn) molecules adsorbed at specific symmetric points on Ag-In-Yb surfaces.
  • Observed molecular structures were consistent with the underlying quasicrystalline substrate ordering.

Conclusions:

  • This study presents the first successful demonstration of quasicrystalline molecular ordering on a template.
  • The findings open avenues for designing novel materials with quasicrystalline properties at the molecular level.