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Related Concept Videos

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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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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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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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Recrystallization: Solid–Solution Equilibria01:10

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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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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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2D Colloidal Crystals with Anisotropic Impurities.

Ya Chen1, Xinlan Tan1, Huaguang Wang1,2

  • 1Institute for Advanced Study, Center for Soft Condensed Matter Physics and Interdisciplinary Research, School of Physical Science and Technology, Soochow University, Suzhou 215006, China.

Physical Review Letters
|July 16, 2021
PubMed
Summary
This summary is machine-generated.

Adding anisotropic ellipsoid impurities to 2D colloidal crystals initially enhances elasticity and preserves orientational order. Above a critical density, order is lost, leading to polycrystalline domains and decreased elasticity.

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Area of Science:

  • Condensed matter physics
  • Soft matter physics
  • Materials science

Background:

  • 2D colloidal crystals exhibit unique properties influenced by defects.
  • Anisotropic impurities can significantly alter crystal lattice behavior.

Purpose of the Study:

  • To investigate the impact of anisotropic ellipsoid impurities on 2D colloidal crystal properties.
  • To determine the critical impurity density for order-disorder transitions.

Main Methods:

  • Utilized video microscopy to study 2D colloidal crystals with varying impurity densities.
  • Analyzed orientational order, elasticity, and dynamics as a function of impurity concentration.

Main Results:

  • Low impurity densities enhance system elasticity and maintain quasi-long-range orientational order.
  • A critical impurity density was identified, above which quasi-long-range orientational order is lost.
  • High impurity densities lead to polycrystalline domains, grain boundary aggregation of impurities, decreased elastic moduli, and heterogeneous dynamics.

Conclusions:

  • Anisotropic ellipsoid impurities induce distinct phase transitions in 2D colloidal crystals.
  • The observed transitions are linked to changes in orientational order, elasticity, and system dynamics.