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Related Concept Videos

The Colloidal State01:29

The Colloidal State

130
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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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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Colloids03:22

Colloids

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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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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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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...
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Coagulation01:06

Coagulation

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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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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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Synthesis and Characterization of Supramolecular Colloids
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How do polydisperse repulsive colloids crystallize?

Robert Botet1, Bernard Cabane2, Lucas Goehring3

  • 1Laboratoire de Physique des Solides, CNRS UMR8502, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France. robert.botet@u-psud.fr.

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|January 14, 2016
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Summary
This summary is machine-generated.

Polydisperse charged colloidal particles spontaneously form complex colloidal crystals through size segregation. This study reveals general rules for fractionated crystallization in nanoparticle suspensions.

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Area of Science:

  • Colloid science
  • Materials science
  • Computational physics

Background:

  • Colloidal crystals are typically formed from monodisperse particles.
  • Polydispersity in particle size often leads to amorphous or simple crystalline structures.
  • Understanding crystallization in polydisperse systems is crucial for designing novel materials.

Purpose of the Study:

  • To investigate the crystallization behavior of polydisperse charged colloidal particles.
  • To elucidate the mechanisms behind spontaneous complex crystal formation.
  • To establish general rules for fractionated crystallization driven by size segregation.

Main Methods:

  • A modified Gibbs-ensemble Monte Carlo simulation method was employed.
  • Simulations focused on systems with fractionated colloidal nanoparticles.
  • Analysis centered on the emergent structures and phase behavior.

Main Results:

  • Demonstrated the spontaneous formation of complex colloidal crystals.
  • Observed the development of very large unit-cells.
  • Identified size segregation as the driving force for fractionated crystallization.
  • Derived general rules applicable to this crystallization process.

Conclusions:

  • Polydisperse charged colloidal particles can self-assemble into intricate crystalline architectures.
  • Size segregation is a key mechanism enabling the formation of complex colloidal crystals.
  • The findings provide a framework for designing and synthesizing advanced colloidal materials.