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Related Concept Videos

Structures of Solids02:22

Structures of Solids

17.8K
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...
17.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.0K
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...
16.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.8K
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

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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Structural diversity in binary nanoparticle superlattices.

Elena V Shevchenko1, Dmitri V Talapin, Nicholas A Kotov

  • 1IBM Research Division, T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, USA.

Nature
|January 7, 2006
PubMed
Summary
This summary is machine-generated.

Scientists assembled diverse nanoparticles into binary nanoparticle superlattices (BNSLs). This bottom-up approach creates novel metamaterials with tunable properties, expanding possibilities in materials science.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Bottom-up assembly of building blocks (atoms, molecules, nanoparticles) is crucial in science.
  • Nanoparticle self-assembly offers precision exceeding lithographic techniques.
  • Binary nanoparticle superlattices (BNSLs) promise cost-effective metamaterials with controlled composition and component placement.

Purpose of the Study:

  • To explore the formation of diverse BNSL structures.
  • To investigate the driving forces behind BNSL formation.
  • To demonstrate a versatile method for creating novel metamaterials.

Main Methods:

  • Utilized combinations of semiconducting, metallic, and magnetic nanoparticle building blocks.
  • Employed sterically stabilized nanoparticles with controlled electrical charges.
  • Analyzed contributions from various forces (entropic, van der Waals, steric, dipolar) to structure stabilization.

Main Results:

  • Successfully formed over 15 different BNSL structures.
  • Reported at least ten previously undocumented colloidal crystalline structures.
  • Demonstrated that nanoparticle electrical charges dictate BNSL stoichiometry.

Conclusions:

  • Electrical charges on nanoparticles are key to BNSL stoichiometry.
  • A combination of forces stabilizes a wide array of BNSL structures.
  • This research expands the library of accessible BNSL structures and metamaterials.