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Related Concept Videos

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...
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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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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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Colloids03:22

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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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Relation between ordering and shear thinning in colloidal suspensions.

Xinliang Xu1, Stuart A Rice, Aaron R Dinner

  • 1The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 23, 2013
PubMed
Summary
This summary is machine-generated.

Shear thinning in colloidal suspensions is not driven by fluid layering, but rather by correlated particle motions and changes in particle packing structure, according to Stokesian dynamics simulations.

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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Published on: January 3, 2014

Area of Science:

  • * Rheology and soft matter physics
  • * Computational fluid dynamics
  • * Statistical mechanics of nonequilibrium systems

Background:

  • * Colloidal suspensions exhibit complex flow behaviors, including shear thinning and shear thickening.
  • * Traditional explanations often attribute these phenomena to fluid layering perpendicular to the shear gradient.
  • * Recent studies question the role of layering, suggesting particle configurations and motions are more critical.

Purpose of the Study:

  • * To investigate the relationship between suspension viscosity, shear rate, and particle configuration in hard sphere suspensions.
  • * To decouple the effects of layering from other factors influencing shear thinning.
  • * To clarify the primary drivers of nonequilibrium phenomena in colloidal flows.

Main Methods:

  • * Utilized Stokesian dynamics simulations for suspensions of hard spheres.
  • * Employed a novel sampling technique designed for nonequilibrium systems.
  • * Analyzed particle configurations and calculated two-particle measures of shear stress.

Main Results:

  • * Demonstrated that shear thinning can occur independently of fluid layering.
  • * Concluded that layering is not the primary driver of shear thinning.
  • * Identified a strong correlation between shear thinning and two-particle shear stress.

Conclusions:

  • * The study challenges the conventional view of fluid layering as the cause of shear thinning in colloidal suspensions.
  • * Correlated particle motions and structural changes in particle packing are more significant factors.
  • * Findings align with recent experimental observations in the field.