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Related Concept Videos

Colloids03:22

Colloids

22.0K
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...
22.0K
Colloidal precipitates01:09

Colloidal precipitates

6.8K
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...
6.8K
Coagulation01:06

Coagulation

1.6K
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...
1.6K
The Colloidal State01:29

The Colloidal State

97
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...
97
Colloids and Suspensions01:17

Colloids and Suspensions

3.8K
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...
3.8K

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Related Experiment Video

Updated: Mar 24, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Shear-driven aggregation of binary colloids for randomly distributing nanoparticles in a matrix.

Xia Meng1, Hua Wu1, Massimo Morbidelli1

  • 1Institute for Chemistry and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland. hua.wu@chem.ethz.ch massimo.morbidelli@chem.ethz.ch.

Soft Matter
|March 18, 2016
PubMed
Summary

This study introduces a novel method for creating composite materials with uniformly distributed nanoparticles. Intense shear forces drive the aggregation of different nanoparticle types, forming stable, additive-free composites.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Nanotechnology

Background:

  • Developing methods for controlled nanoparticle distribution in composite materials is crucial.
  • Uniformly dispersing different nanoparticle types within a matrix remains a challenge.

Purpose of the Study:

  • To propose and demonstrate a novel methodology for preparing composite materials with uniformly distributed nanoparticles.
  • To achieve controlled aggregation of binary colloids without additives.

Main Methods:

  • Utilizing intense shear-driven aggregation of binary colloids composed of different nanoparticle types.
  • Employing poly-methyl methacrylate (PMMA) and polystyrene (PS) particles as model systems.
  • Analyzing particle distribution using Scanning Electron Microscopy (SEM).

Main Results:

  • Successful shear-driven aggregation of binary PMMA and PS colloids was achieved.
  • Formed clusters contained both shear-active PS and shear-inactive PMMA particles.
  • SEM analysis confirmed uniform and random distribution of PMMA within the PS matrix.

Conclusions:

  • The proposed shear-driven aggregation methodology is feasible for creating nanoparticle composites.
  • This method offers a way to achieve uniform distribution of different nanoparticles without additives.
  • The findings provide insights into the mechanism of binary colloid aggregation under shear.