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Related Concept Videos

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...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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...
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...
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...
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Crystallization in a sheared colloidal suspension.

Boris Lander1, Udo Seifert, Thomas Speck

  • 1II. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.

The Journal of Chemical Physics
|June 21, 2013
PubMed
Summary
This summary is machine-generated.

Shear flow impacts colloidal crystallization by suppressing initial nucleation but enhancing growth of critical nuclei. An optimal strain rate maximizes the overall crystallization rate, revealing mechanisms of pre-structured liquid inhibition.

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Synthesis and Characterization of Supramolecular Colloids
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Published on: April 22, 2016

Area of Science:

  • Colloidal science
  • Soft matter physics
  • Materials science

Background:

  • Colloidal suspensions are model systems for studying phase transitions.
  • Shear flow is a common external field applied to materials.
  • Understanding crystallization kinetics is crucial for material design.

Purpose of the Study:

  • To investigate the effect of simple shear flow on the crystallization of supersaturated colloidal suspensions.
  • To identify the mechanisms by which shear flow influences nucleation and growth.
  • To determine if an optimal shear rate exists for maximizing crystallization.

Main Methods:

  • Numerical simulations of repulsive colloidal particles under shear flow.
  • Discrete state model to analyze local structural transitions.
  • Markovian analysis of crystallization dynamics.

Main Results:

  • Shear flow exhibits a dual effect: suppressing initial nucleation while enhancing the growth of critical nuclei.
  • An optimal shear rate was identified, maximizing the overall crystallization rate.
  • The suppression of nucleation is attributed to the inhibition of pre-structured liquid states.

Conclusions:

  • Shear flow significantly alters colloidal crystallization kinetics.
  • The interplay between nucleation suppression and growth enhancement leads to an optimal shear rate.
  • The discrete state model provides insights into the microscopic mechanisms governing shear-induced crystallization.