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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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 Colloidal State01:29

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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...
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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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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Characterization of sheared colloidal aggregation using Langevin dynamics simulation.

Sergiy Markutsya1, Rodney O Fox2, Shankar Subramaniam1

  • 1Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
PubMed
Summary
This summary is machine-generated.

Colloidal particle aggregation under shear forms anisotropic, cigar-like structures. A new analysis method distinguishes these from isotropic aggregates, revealing shear-dependent structural changes.

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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Computational Materials Science

Background:

  • Colloidal aggregation influences material properties.
  • Understanding shear effects on aggregation is crucial for industrial applications.
  • Existing models for colloidal aggregation lack detailed characterization of shear-induced structures.

Purpose of the Study:

  • To investigate colloidal particle aggregation under shear flow.
  • To characterize the structural changes and anisotropy induced by shear.
  • To develop a new analytical method for describing sheared aggregates.

Main Methods:

  • Langevin dynamics simulations with an improved interparticle potential.
  • Analysis of aggregate structure using fractal dimension and radius of gyration.
  • Introduction of a novel compactness-anisotropy analysis.

Main Results:

  • Nonsheared aggregates exhibit a scale-dependent fractal dimension, transitioning from compact to ramified structures.
  • Sheared aggregates form anisotropic, cigar-like structures limited in size by shear-induced breakage.
  • The compactness-anisotropy analysis successfully distinguishes sheared from nonsheared aggregates.

Conclusions:

  • Shear flow significantly alters colloidal aggregate morphology, inducing anisotropy.
  • Fractal dimension is insufficient for characterizing anisotropic aggregates; compactness-anisotropy analysis is proposed.
  • The study provides a framework for understanding and predicting outcomes of sheared colloidal aggregation.