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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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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.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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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.
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Atomically Traceable Nanostructure Fabrication
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2D amorphous solids for sub-nanometer scale devices.

Hyeonseo Jang1, Hyeonju Kim1, Gayoon Kim1

  • 1Division of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul, 03760, Korea.

Nano Convergence
|November 24, 2024
PubMed
Summary
This summary is machine-generated.

Ultrathin 2D amorphous solids offer unique electronic and mechanical properties due to their short-range order. This review explores their synthesis, properties, and potential for next-generation electronic devices.

Keywords:
2D amorphous solidsPhase transitionSub-nanometer scale devices

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Amorphous solids lack long-range lattice order but possess short-range order, influencing their properties.
  • Two-dimensional (2D) amorphous solids exhibit unique mechanical and electronic characteristics not found in crystalline counterparts.

Purpose of the Study:

  • To review the physical properties of ultrathin 2D amorphous solids.
  • To discuss their formation, structure, and potential applications.
  • To highlight advancements in synthesis and phase transitions.

Main Methods:

  • Review of existing literature on 2D amorphous solids.
  • Analysis of structural features like polyhedron structures and covalent bonding.
  • Discussion of synthesis techniques for high-quality amorphous films.

Main Results:

  • 2D amorphous solids possess exceptional properties due to covalent bonding and specific structural motifs.
  • Examples include honeycomb-structured nanosheets and layered materials with reduced coordination.
  • Phase transitions, synthesis methods, and applications at the sub-nanometer scale are detailed.

Conclusions:

  • 2D amorphous solids represent a promising class of materials with tunable properties.
  • Advanced synthesis enables precise control over film thickness and quality.
  • These materials hold significant potential for revolutionizing sub-nanometer scale electronic devices.