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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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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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The Colloidal State

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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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Ionic Crystal Structures

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Synthesis and Characterization of Supramolecular Colloids
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Published on: April 22, 2016

Colloidal nanocube supercrystals stabilized by multipolar Coulombic coupling.

Henry Chan1, Arnaud Demortière, Lela Vukovic

  • 1Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA.

ACS Nano
|April 17, 2012
PubMed
Summary

Colloidal platinum nanocubes self-assemble into different supercrystal structures. Truncated nanocubes favor face-centered cubic (fcc) packing due to multipolar electrostatic fields from ligand-core interactions.

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Area of Science:

  • Colloid Science
  • Materials Science
  • Nanotechnology

Background:

  • Colloidal nanocrystals offer tunable properties for self-assembly.
  • Platinum nanocubes are of interest due to their catalytic and electronic properties.
  • Understanding self-assembly principles is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the microscopic principles governing the self-assembly of octylamine-coated platinum nanocubes.
  • To determine the influence of nanocube shape on supercrystal packing structures.
  • To elucidate the forces driving the observed self-assembly behaviors.

Main Methods:

  • Experimental self-assembly of platinum nanocubes in toluene.
  • Atomic force field modeling.
  • Atomistic molecular dynamics simulations.
  • Analysis of nanocrystal coupling forces.

Main Results:

  • Regular platinum nanocubes (5.5 nm edge) formed simple cubic supercrystals.
  • Slightly truncated platinum nanocubes (4.7 nm edge) preferentially formed face-centered cubic (fcc) supercrystals.
  • Multipolar electrostatic fields, arising from charge transfer between octylamine ligands and platinum cores, were identified as the driving force for fcc packing in truncated nanocubes.

Conclusions:

  • Nanocube shape significantly dictates self-assembly pathways and resulting supercrystal structures.
  • Electrostatic interactions, particularly multipolar fields, play a critical role in directing the assembly of truncated nanocubes into denser packings.
  • This work provides fundamental insights into the design principles for self-assembled colloidal superlattices.