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Related Concept Videos

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...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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...
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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...

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Highly monodisperse core-shell particles created by solid-state reactions.

V Radmilovic1, C Ophus, E A Marquis

  • 1National Center for Electron Microscopy, Materials Science Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USA. VRRadmilovic@lbl.gov

Nature Materials
|August 9, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to control nanoparticle size in alloys using a two-step heat treatment. This technique creates highly uniform particle distributions, improving alloy properties and mechanical behavior.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nanotechnology

Background:

  • Particle size distribution is critical for nanomaterial properties and the mechanical behavior of alloys strengthened by nanoscale precipitates.
  • Controlling particle size distribution during solid-state precipitation in alloys remains a significant challenge.

Purpose of the Study:

  • To demonstrate an approach for achieving highly monodisperse particle size distributions in alloys via simple solid-state reactions.
  • To investigate the formation of core-shell precipitates in Aluminum-Scandium-Lithium (Al-Sc-Li) alloys.

Main Methods:

  • Utilizing a two-step heat treatment process involving core formation at high temperatures and shell growth at lower temperatures.
  • Exploiting a 'size focusing' regime where precipitate shell growth rate is dependent on particle size.

Main Results:

  • Successfully formed highly monodisperse core-shell precipitates in Al-Sc-Li alloys.
  • Demonstrated that controlled core growth enables a size focusing effect for shell development, leading to uniform particle sizes.
  • Showcased the effectiveness of simple solid-state reactions for precise control over precipitate morphology.

Conclusions:

  • The developed two-step heat treatment strategy effectively controls precipitate size distribution in alloys.
  • This approach offers a viable method for manipulating precipitate size and morphology in similar alloy systems.
  • Findings provide strategies for enhancing alloy mechanical properties through controlled nanoscale precipitate engineering.