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Related Concept Videos

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

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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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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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...
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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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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Updated: May 16, 2025

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
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A One-Component Patchy-Particle Icosahedral Quasicrystal.

Eva G Noya1, Jonathan P K Doye2

  • 1Instituto de Química Física Blas Cabrera, Consejo Superior de Investigaciones Científicas, CSIC, Calle Serrano 119, 28006 Madrid, Spain.

ACS Nano
|April 1, 2025
PubMed
Summary
This summary is machine-generated.

Researchers designed simple patchy particles that self-assemble into icosahedral quasicrystals (IQCs) in simulations. These IQCs, stabilized by entropy, offer potential for photonic applications and realization via DNA origami or protein design.

Keywords:
computer simulationsicosahedral quasicrystalnanoparticlespatchy particleself-assembly

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Area of Science:

  • Materials Science
  • Crystallography
  • Soft Matter Physics

Background:

  • Icosahedral quasicrystals (IQCs) are complex structures with limited realization beyond metallic alloys.
  • Designing simple building blocks for IQC formation is crucial for broader applications.

Purpose of the Study:

  • To introduce a one-component patchy-particle system capable of forming face-centered IQCs.
  • To explore the self-assembly mechanisms and properties of these novel IQCs.

Main Methods:

  • Computational simulations of one-component patchy-particle systems.
  • Analysis of orientational and positional order using higher-dimensional methods.
  • Thermodynamic analysis comparing IQCs with periodic approximants.

Main Results:

  • Successful formation of interconnected icosahedral networks, yielding face-centered IQCs.
  • Directional bonding promotes icosahedral orientational and quasiperiodic positional order.
  • IQCs exhibit entropic stabilization via phason disorder, with energies comparable to periodic structures.

Conclusions:

  • One-component patchy particles provide a viable route to simple, self-assembled IQCs.
  • These IQCs possess favorable properties, including potential photonic band gaps.
  • The findings suggest practical realization using protein design or DNA origami technologies.