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Related Concept Videos

Colloids03:22

Colloids

21.7K
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...
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Colloidal precipitates01:09

Colloidal precipitates

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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...
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Colloids and Suspensions01:17

Colloids and Suspensions

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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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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...
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Related Experiment Video

Updated: Feb 26, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Colloidal particles with complex microstructures via phase separation in swelled polymer microspheres.

Zhang Luo1, Yitong Li1, Bing Liu1

  • 1State Key Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China. liubing@iccas.ac.cn and University of Chinese Academy of Sciences, Beijing, 100149, China.

Chemical Communications (Cambridge, England)
|July 14, 2017
PubMed
Summary
This summary is machine-generated.

Researchers created complex polymer microparticles with unique structures like hollow spheres and porous particles using phase separation. Incorporating sulfonic acid groups was key to achieving these distinct microstructures, unlike standard polystyrene beads.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polymer microparticles are widely used in various applications.
  • Controlling microstructure is essential for tuning particle properties.
  • Existing methods often yield simple spherical structures.

Purpose of the Study:

  • To develop a method for creating polymer microparticles with complex and diverse microstructures.
  • To investigate the role of specific chemical modifications in microstructure formation.
  • To demonstrate the contrast with conventional polymer microspheres.

Main Methods:

  • Utilizing phase separation within polymer microspheres.
  • Incorporating sulfonic acid groups into the polymer matrix.
  • Characterizing the resulting microparticle morphologies.

Main Results:

  • Successfully prepared microparticles with intricate structures: cut spheres, bowl-like particles, hollow spheres with holes, and porous hollow spheres.
  • Demonstrated that the presence of sulfonic acid groups is critical for forming these complex architectures.
  • Observed significant structural differences compared to microparticles made from unmodified polystyrene.

Conclusions:

  • Phase separation is an effective technique for generating complex polymer microparticle morphologies.
  • Sulfonic acid functionalization plays a pivotal role in directing microstructure formation.
  • The developed method offers a route to novel polymer microparticles with tailored structures.