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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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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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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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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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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.
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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.
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Updated: May 31, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Defect Structures in Colloidal Crystals and Their Effect on Grating Diffraction Structural Color.

Tianyu Liu1, Chih-Mei Young1, Timothy C Moore1

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.

ACS Applied Materials & Interfaces
|January 22, 2025
PubMed
Summary
This summary is machine-generated.

Engineered colloidal crystals display tunable structural colors by controlling crystal defects. This research provides design rules for structural color intensity and uniformity in colloidal self-assembly.

Keywords:
FDTDcolloidal crystaldefectelectrophoretic depositionfluid dynamicsmolecular dynamicsself-assemblystructural color

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Area of Science:

  • Materials Science
  • Optics
  • Soft Matter Physics

Background:

  • Colloidal crystals generate structural colors via light diffraction.
  • Controlling crystal defects is key to engineering color properties.

Purpose of the Study:

  • Develop design rules for structural color in colloidal crystals.
  • Investigate the impact of crystal defects on color intensity and uniformity.

Main Methods:

  • Self-assembly of colloidal crystals using DC electric fields.
  • Varying ion concentration and electric current to control crystal quality.
  • Molecular Dynamics (MD) and Finite-Difference Time-Domain (FDTD) simulations.
  • Experimental characterization of structural color and diffraction efficiency.

Main Results:

  • Structural color intensity strongly correlates with crystal quality (ψ₆) and grain density.
  • Diffraction efficiency varied by ~2.5x with changes in crystal order.
  • MD simulations reproduced self-assembly kinetics and structures.
  • FDTD simulations showed agreement between calculated and experimental spectra.

Conclusions:

  • Grating diffraction structural color can be controlled by manipulating crystal quality and polycrystallinity.
  • Identified a design trade-off between diffraction intensity and azimuthal uniformity.
  • Provides a framework for designing advanced photonic materials with tailored colors.