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Related Concept Videos

Coagulation01:06

Coagulation

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...
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...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
Colloids03:22

Colloids

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...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
10:17

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Sedimentation of aggregating colloids.

Jonathan K Whitmer1, Erik Luijten

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

The Journal of Chemical Physics
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

Gravitational stress and polymer interactions influence colloidal suspensions. Depending on these forces, sediments form stable structures or become kinetically arrested, impacting material properties.

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Polymer Physics

Background:

  • Colloidal suspensions are complex systems influenced by multiple forces.
  • Understanding sedimentation is crucial for material stability and processing.
  • Brownian motion, gravity, and interparticle interactions dictate suspension behavior.

Purpose of the Study:

  • To investigate the combined effects of gravity, attractive interactions, and Brownian motion in colloidal suspensions.
  • To classify sedimentation regimes based on attraction strength and gravitational stress.
  • To compare simulation results with experimental data for mechanistic insights.

Main Methods:

  • Large-scale molecular dynamics simulations were employed.
  • Systematic classification of different regimes was performed.
  • Direct comparisons to experimental results were made.

Main Results:

  • Sedimentation can lead to equilibrium structures or kinetically arrested states.
  • Strong attractions promote cluster aggregation and low-density arrested states.
  • Moderate attractions can enhance colloidal crystallization in sediments.

Conclusions:

  • The interplay of gravity and polymer-induced interactions governs colloidal suspension structure.
  • Mechanisms for mechanically stable sediments can be inferred from simulation and experimental data.
  • This study provides a framework for predicting colloidal sediment behavior.