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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

5.7K
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...
5.7K
Coagulation01:06

Coagulation

1.5K
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...
1.5K
Centrifugation01:05

Centrifugation

6.9K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
6.9K
The Colloidal State01:29

The Colloidal State

184
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...
184

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Related Experiment Video

Updated: May 4, 2026

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
12:47

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Published on: October 4, 2012

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Purifying colloidal nanoparticles through ultracentrifugation with implications for interfaces and materials.

Joseph B Miller1, John M Harris, Erik K Hobbie

  • 1Department of Physics and Department of Coatings and Polymeric Materials, North Dakota State University , Fargo, North Dakota 58108, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 15, 2014
PubMed
Summary

Density-gradient ultracentrifugation (DGU) effectively purifies diverse nanomaterials. This method allows tuning the properties of thin films made from single-walled carbon nanotubes and silicon nanocrystals.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Colloidal Science

Background:

  • Liquid-phase processing and colloidal self-assembly are crucial for advanced nanotechnology.
  • Efficient purification of diverse nanomaterials (nanocrystals, nanotubes, nanoplates) remains a challenge.
  • Density-gradient ultracentrifugation (DGU) is a proven technique for separating biological macromolecules and is emerging for nanoparticle purification.

Purpose of the Study:

  • To review recent contributions to nanomaterial purification using DGU.
  • To highlight the implications of DGU fractionation for interfaces and materials.
  • To demonstrate property modification of thin films assembled from purified nanomaterials.

Main Methods:

  • Utilized transient and isopycnic DGU in aqueous and organic media.
  • Fractionated colloidal nanoparticles, specifically single-walled carbon nanotubes and silicon nanocrystals.
  • Assembled thin films from fractionated nanomaterials for property analysis.

Main Results:

  • Demonstrated effective purification of colloidal nanoparticles by size, optical, and electronic properties using DGU.
  • Showcased modification of mechanical, electronic, and optical properties of thin films.
  • Provided explicit examples of DGU's utility in tailoring nanomaterial film characteristics.

Conclusions:

  • DGU is a powerful technique for purifying and tailoring properties of nanomaterials for advanced applications.
  • Fractionation via DGU enables precise control over thin film properties.
  • This approach has significant implications for the development of next-generation materials and devices.