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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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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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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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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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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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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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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Structure and reentrant percolation in an inverse patchy colloidal system.

J L B de Araújo1, F F Munarin2, G A Farias1

  • 1Department of Physics, Federal University of Ceará, Fortaleza, Ceará 60.455-970, Brazil.

Physical Review. E
|July 16, 2017
PubMed
Summary
This summary is machine-generated.

Researchers simulated inverse patchy colloids to understand self-assembly. They discovered diverse structures and a reentrant percolation transition influenced by net charge, revealing key mechanisms for system organization.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Computational Materials Science

Background:

  • Investigating self-assembly in two-dimensional colloidal systems is crucial for designing novel materials.
  • Inverse patchy colloids offer unique interaction potentials for complex structure formation.

Purpose of the Study:

  • To explore the self-assembly behavior of two-dimensional inverse patchy colloids.
  • To construct phase diagrams and identify factors governing structural transitions.
  • To understand the mechanisms behind percolation transitions.

Main Methods:

  • Molecular dynamics simulations were employed to model disk-shaped colloids with central charges and surface patches.
  • System configurations were analyzed across varying net charges, area fractions, and interaction potential ranges.

Main Results:

  • Diverse ground state configurations were observed, including crystalline, linear, ramified, and percolated structures.
  • Two structural phase diagrams were successfully constructed.
  • A reentrant percolation transition was identified as a function of the net charge.

Conclusions:

  • The net charge and interaction range significantly influence the self-assembly and emergent structures of inverse patchy colloids.
  • Distinct mechanisms driving percolation transitions were elucidated.
  • This study provides insights into controlling colloidal self-assembly for potential applications.