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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...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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: Jun 13, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Light-triggered reversible phase transfer of composite colloids.

Ying Wu1, Chengliang Zhang, Xiaozhong Qu

  • 1State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Science, Beijing 100190, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 28, 2010
PubMed
Summary

Light-responsive polymer brushes on silica colloids create switchable composite materials. These smart colloids can transition between oil and water, acting as tunable particulate emulsifiers triggered by light.

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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

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Related Experiment Videos

Last Updated: Jun 13, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Published on: October 31, 2019

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Colloid Science

Background:

  • Spiropyran molecules exhibit photochromism, changing properties upon light exposure.
  • Controlling the hydrophobicity/hydrophilicity of materials is crucial for applications like emulsification.
  • Grafting polymers onto inorganic nanoparticles offers a route to functional composite materials.

Purpose of the Study:

  • To synthesize composite colloids with light-responsive polymer brushes.
  • To investigate the reversible transition between hydrophobic and hydrophilic states.
  • To demonstrate the utility of these composite colloids as particulate emulsifiers.

Main Methods:

  • Grafting spiropyran polymer brushes onto silica colloid surfaces.
  • Utilizing UV and visible light irradiation to trigger reversible state changes.
  • Characterizing the colloidal behavior in oil and water phases.

Main Results:

  • Successfully prepared composite colloids with optically responsive spiropyran polymer brushes.
  • Demonstrated reversible switching between hydrophobic and hydrophilic states upon light irradiation.
  • Observed amphiphilic behavior at intermediate irradiation stages, enabling particulate emulsification.

Conclusions:

  • Composite colloids with light-switchable polymer brushes offer tunable interfacial properties.
  • These materials can reversibly transfer between oil and water phases, controlled by light.
  • The developed amphiphilic composite colloids show promise as effective particulate emulsifiers.