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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...
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...
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...

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Related Experiment Video

Updated: May 12, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Shaping colloids for self-assembly.

Stefano Sacanna1, Mark Korpics, Kelvin Rodriguez

  • 1Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA. s.sacanna@nyu.edu

Nature Communications
|April 12, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create diverse anisotropic colloids by deforming multiphase particles. This technique allows for controlled functionalization, enabling the design of advanced materials from the nanoscale up.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Area of Science:

  • Colloid and surface science
  • Materials science
  • Nanotechnology

Background:

  • Material properties are determined by the behavior of their constituent building blocks.
  • Particle shape is crucial for self-organization and the creation of hierarchical structures at the colloidal scale.
  • Existing methods for creating anisotropic colloids are limited.

Purpose of the Study:

  • To develop a simple and general method for generating a wide variety of anisotropic colloidal particles.
  • To demonstrate control over particle deformation, functionalization, and coating.
  • To enable the design of novel engineered materials with tailored macroscopic properties.

Main Methods:

  • Controlled deformation of multiphase colloidal particles.
  • Selective liquefaction, polymerization, dissolution, and bulk functionalization of particles.
  • Creation of patchy and Janus colloids through controlled functionalization and coating.

Main Results:

  • A diverse range of new anisotropic colloids were successfully generated.
  • The method allows for precise control over particle shape and surface properties.
  • Demonstrated the ability to create both patchy and Janus colloids with specific functionalities.

Conclusions:

  • The developed method offers a versatile platform for producing anisotropic colloids.
  • This approach facilitates the bottom-up fabrication of complex materials with tunable properties.
  • Opens new avenues for designing advanced materials through precise control of building block architecture.