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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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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Predicting crystals of Janus colloids.

Teun Vissers1, Zdenek Preisler, Frank Smallenburg

  • 1Dipartimento di Fisica, Sapienza Università di Roma, Roma, Italy.

The Journal of Chemical Physics
|May 3, 2013
PubMed
Summary

Janus colloids form complex crystal structures and novel bilayer phases. This study maps their phase diagram, revealing unexpected behaviors like re-entrant gas-liquid coexistence driven by micellization.

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Area of Science:

  • Colloid science
  • Materials science
  • Statistical mechanics

Background:

  • Janus colloids are anisotropic particles with distinct properties on different faces.
  • Understanding their phase behavior is crucial for designing novel materials and self-assembly processes.

Purpose of the Study:

  • To computationally explore the phase diagram of a simple Janus colloid model.
  • To identify and characterize ordered and disordered structures, including crystalline and fluid phases.
  • To investigate the stability and transitions between different phases under varying thermodynamic conditions.

Main Methods:

  • Numerical simulations were employed to generate various crystal structures.
  • Free-energy calculations and thermodynamic integration were used to determine phase stability.
  • The study analyzed phase behavior in pressure-temperature and temperature-density planes.

Main Results:

  • Janus colloids form stable crystalline structures with complex bond-topologies on face-centered-cubic or hexagonal-close-packed lattices.
  • A novel phase of wrinkled bilayer sheets was discovered, competing with fluid and crystal phases.
  • Metastable gas-liquid coexistence exhibiting micellization-driven re-entrant behavior was observed.

Conclusions:

  • Simple Janus colloid models can exhibit rich and complex phase behavior.
  • The identified phases, including bilayer sheets and re-entrant coexistence, offer new possibilities for materials design.
  • Further research into Janus colloid self-assembly can lead to advanced functional materials.