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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...
Coagulation01:06

Coagulation

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...
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...

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

Functional colloidal trimers by quenched electrostatic assembly.

Joseph J McDermott1, Neetu Chaturvedi, Darrell Velegol

  • 1The Pennsylvania State University, Department of Chemical Engineering, University Park, PA 16802, USA.

Physical Chemistry Chemical Physics : PCCP
|September 11, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed Quenched Electrostatic Assembly to create custom colloidal trimers from various materials. This scalable method allows sequential assembly for applications like catalytic motors.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Colloidal assemblies offer tunable properties for advanced applications.
  • Precise control over multi-component nanoparticle assembly remains a challenge.

Purpose of the Study:

  • To present a novel method for synthesizing multi-component colloidal trimers.
  • To demonstrate the assembly of particles with varying materials, sizes, and sequences.
  • To explore the functional properties of the assembled trimers.

Main Methods:

  • Utilized diffusion-limited aggregation of oppositely charged particles.
  • Introduced a nanoparticle coating to quench aggregation at a specific stage.
  • Named the process Quenched Electrostatic Assembly (QEA).

Main Results:

  • Successfully assembled various colloidal trimers, including polystyrene-silica-polystyrene and gold-silicon-silver.
  • Demonstrated sequential assembly (e.g., 1-2-3, 2-1-3).
  • The gold-silicon-silver trimer functioned as a catalytic motor in hydrogen peroxide solution.
  • Achieved mechanically stable assemblies by fusing polymer nanoparticles above their glass transition temperature.

Conclusions:

  • Quenched Electrostatic Assembly is a general and scalable method for synthesizing multi-component colloidal trimers.
  • QEA allows for controlled sequential assembly without requiring specific orientations.
  • The method enables the creation of functional colloidal devices, such as catalytic motors.