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Related Concept Videos

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...
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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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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.9K
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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Network Covalent Solids02:18

Network Covalent Solids

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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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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Superlattices assembled through shape-induced directional binding.

Fang Lu1, Kevin G Yager1, Yugang Zhang1

  • 1Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.

Nature Communications
|April 24, 2015
PubMed
Summary
This summary is machine-generated.

Researchers used DNA-programmed polyhedral blocks and spherical nanoparticles to create novel 3D binary superlattices. This shape-driven assembly strategy enables precise control over nanoscale structure fabrication.

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Area of Science:

  • Nanotechnology and Materials Science
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Conventional nanoparticle lattice organization relies on packing principles.
  • Achieving diverse nanoscale structures with directional binding is challenging.
  • Anisotropic building blocks are key to expanding structural possibilities.

Purpose of the Study:

  • To investigate the assembly of nanoparticle clusters and lattices using anisotropic polyhedral blocks.
  • To explore shape-induced directional interactions facilitated by DNA recognition for nanoscale assembly.
  • To demonstrate the fabrication of 3D binary superlattices with controlled symmetry.

Main Methods:

  • Utilized anisotropic polyhedral blocks (cubes and octahedrons) and isotropic spherical nanoparticles.
  • Employed DNA recognition for mediating interactions between blocks and spheres.
  • Analyzed the symmetry of polyhedron facets and DNA-tuned interactions to determine lattice structure.

Main Results:

  • Polyhedral blocks directed the assembly of clusters with architectures dictated by their symmetry.
  • Formation of 3D binary superlattices was achieved by accommodating shape disparity with DNA shells.
  • Crystallographic symmetry of lattices correlated with the spatial symmetry of block facets.

Conclusions:

  • Shape-induced interactions, guided by DNA, enable precise control over nanoscale binary lattice assembly.
  • This strategy offers a novel pathway for the by-design fabrication of complex 3D superlattices.
  • The findings open new possibilities for creating advanced nanomaterials with tailored structures.