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Related Concept Videos

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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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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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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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.
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Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Point defects in crystals of charged colloids.

Rinske M Alkemade1, Marjolein de Jager1, Berend van der Meer2

  • 1Soft Condensed Matter, Debye Institute of Nanomaterials Science, Utrecht University, Utrecht, The Netherlands.

The Journal of Chemical Physics
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Summary

Point defects like vacancies and interstitials are common in colloidal crystals. Computer simulations reveal these defects are more prevalent in body-centered-cubic (BCC) crystals, with interstitials appearing as exotic crowdions.

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Area of Science:

  • Colloidal science
  • Condensed matter physics
  • Crystallography

Background:

  • Charged colloidal particles are model systems for studying atomic and colloidal crystals.
  • These particles self-assemble into ordered structures like body-centered-cubic (BCC) and face-centered-cubic (FCC) lattices.
  • Point defects (vacancies, interstitials) significantly influence crystal properties but are often overlooked.

Purpose of the Study:

  • To characterize point defects (vacancies and interstitials) in BCC and FCC colloidal crystals.
  • To compare the prevalence and nature of defects in BCC versus FCC crystal phases.
  • To investigate the manifestation of interstitials in BCC crystals.

Main Methods:

  • Utilized computer simulations to model colloidal crystals.
  • Performed free-energy calculations to analyze defect formation.
  • Focused on systems of point-Yukawa particles.

Main Results:

  • Defects are found to be more common in the BCC phase compared to the FCC phase.
  • Interstitials in BCC crystals manifest as one-dimensional 'crowdions'.
  • This provides a theoretical basis for observing these defects experimentally.

Conclusions:

  • BCC colloidal crystals exhibit a higher density of point defects than FCC crystals.
  • The identification of crowdion defects in BCC systems offers new avenues for research.
  • These findings enhance the understanding of defect behavior in crystalline materials.