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Related Concept Videos

The Colloidal State01:29

The Colloidal State

181
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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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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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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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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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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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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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.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Stabilizing colloidal crystals by leveraging void distributions.

Nathan A Mahynski1, Athanassios Z Panagiotopoulos1, Dong Meng2

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA.

Nature Communications
|July 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to stabilize specific crystal structures by using polymer additives. This technique exploits differences in void spaces within competing polymorphs, enabling control over thermodynamic stability for applications like photonic bandgap materials.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Crystallography

Background:

  • Colloids frequently form polymorphic structures with minimal free energy differences.
  • Simultaneous crystallization of face-centered cubic (FCC) and hexagonal close-packed (HCP) structures is common, leading to poor long-range order.
  • This lack of order hinders applications in areas like photonic bandgap materials.

Purpose of the Study:

  • To develop a method for selectively stabilizing one of two competing crystal polymorphs.
  • To overcome the limitations imposed by simultaneous crystallization and lack of long-range order.
  • To enable the use of colloidal crystals in advanced material applications.

Main Methods:

  • Utilizing polymeric additives with tunable geometries.
  • Exploiting differences in the spatial distribution of voids between competing polymorphs.
  • Controlling thermodynamic stability through additive-induced entropy loss related to crystal void symmetries.

Main Results:

  • A generalizable method to stabilize a selected crystal polymorph was demonstrated.
  • The method successfully controlled which polymorph became thermodynamically stable.
  • The approach leverages differences in void symmetries and additive entropy loss.

Conclusions:

  • A novel and generalizable strategy for stabilizing specific colloidal crystal polymorphs has been established.
  • This method offers precise control over crystal structure selection, overcoming previous limitations.
  • The findings pave the way for enhanced applications of colloidal crystals, particularly in photonics.