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Related Concept Videos

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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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Ionic Crystal Structures02:42

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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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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,...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Updated: Jun 26, 2025

Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
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Bio-Inspired Crystalline Core-Shell Guanine Spherulites.

Lotem Alus1,2, Lothar Houben3, Noy Shaked1

  • 1Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, 76100, Israel.

Advanced Materials (Deerfield Beach, Fla.)
|May 9, 2024
PubMed
Summary

Scientists synthesized core-shell spherulites from guanine crystals, mimicking natural structures found in crustacean eyes. These synthetic particles efficiently scatter light, offering inspiration for new optical materials.

Keywords:
core‐shell spherulitesemulsionguanine crystalslight‐scattering

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Area of Science:

  • Materials Science
  • Biomimetic Optics
  • Crystallography

Background:

  • Spherulites are light-manipulating particles with unique optical properties due to their structure and birefringence.
  • Naturally occurring core-shell spherulites in decapod crustaceans exhibit exceptional light-scattering capabilities.
  • These biogenic structures lack synthetic counterparts, limiting the development of advanced scattering media.

Purpose of the Study:

  • To synthesize core-shell spherulites using guanine crystal platelets.
  • To investigate the optical properties of these synthetic spherulites.
  • To explore their potential as biomimetic scattering media.

Main Methods:

  • A two-step emulsification process (water/oil/water) was employed to create the spherulites.
  • Induced pH changes promoted interfacial crystallization of guanine.
  • Mie theory calculations and forward scattering measurements analyzed optical properties.

Main Results:

  • Successfully synthesized core-shell spherulites composed of radially stacked β-guanine platelets.
  • Platelets were oriented tangentially to the spherulite surface.
  • Synthetic spherulites exhibited a high tangential refractive index, comparable to biogenic particles.

Conclusions:

  • The synthesis provides a method for creating biomimetic guanine spherulites.
  • These synthetic particles demonstrate efficient light scattering, similar to natural counterparts.
  • The study offers a proof-of-concept for thin scattering media inspired by nature.