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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...
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...
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...
Colloids and Suspensions01:17

Colloids and Suspensions

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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Related Experiment Video

Updated: May 20, 2026

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
09:55

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Published on: June 23, 2017

Janus colloidal matchsticks.

Kundan Chaudhary1, Qian Chen, Jaime J Juárez

  • 1Department of Materials Science and Engineering and the Frederick Seitz Materials Research Laboratory, ‡Department of Physics, and §Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|August 1, 2012
PubMed
Summary
This summary is machine-generated.

Chemically anisotropic silica rods with gold tips, termed Janus matchsticks, were fabricated. These particles spontaneously assemble into complex multipod structures in solution.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Nanotechnology

Background:

  • Chemically and shape-anisotropic colloids are crucial for advanced materials.
  • Controlling self-assembly of anisotropic particles is challenging.

Purpose of the Study:

  • To fabricate and characterize novel Janus matchstick colloids.
  • To investigate the self-assembly behavior of these anisotropic particles.

Main Methods:

  • Multistep fabrication involving electric-field alignment, crystallization, microcontact printing, and selective metallization.
  • Direct observation of self-assembly in aqueous solution.

Main Results:

  • Successful fabrication of silica-gold Janus matchstick colloids.
  • Observation of self-assembly into multipod structures (bi-, tri-, and tetrapods).
  • Variability in coordination number and patch angle of assembled structures.

Conclusions:

  • Janus matchsticks are a versatile building block for complex colloidal assemblies.
  • The self-assembly process offers control over structure formation.