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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.2K
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....
18.2K
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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.5K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.5K
Structures of Solids02:22

Structures of Solids

14.0K
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...
14.0K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
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...
9.5K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Depletion-Induced Tunable Assembly of Complementary Platonic Solids.

Rahul Nag1, Nina Rouvière2, Jaime Gabriel Trazo1

  • 1Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Orsay 91405, France.

Nano Letters
|December 12, 2024
PubMed
Summary

We developed depletion-induced self-assembly (DISA) to create tunable binary nanoparticle lattices. This method assembles diverse nanoparticle shapes into ordered supercrystals with controlled spacing and packing density.

Keywords:
binary assemblygold nanoparticlesliquid cell TEMoctahedrasmall angle X-ray scatteringtetrahedra

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Multicomponent self-assembly is key for novel metamaterials.
  • Assembling nanoparticles with complementary shapes is challenging.
  • Existing methods include DNA base pairing and solvent evaporation.

Purpose of the Study:

  • Introduce depletion-induced self-assembly (DISA) for nanoparticle binary lattices.
  • Demonstrate DISA's ability to create tunable, ordered structures.
  • Explore control over interparticle distance and packing fraction.

Main Methods:

  • Utilized a binary mixture of octahedra and tetrahedra nanoparticles.
  • Employed depletion-induced self-assembly (DISA) in a liquid phase.
  • Performed in situ structural analysis in real and reciprocal spaces.

Main Results:

  • Achieved self-assembly of octahedra and tetrahedra into extended supercrystals.
  • Observed Fm3m symmetry in the resulting binary lattices.
  • Demonstrated tunable interparticle distance via depletant concentration.
  • Controlled packing fraction (φ) between 0.37 and 0.66.

Conclusions:

  • DISA is a novel and versatile approach for nanoparticle assembly.
  • This method enables the creation of tunable binary supercrystals.
  • DISA offers potential for designing complex metamaterials with tailored properties.