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Related Concept Videos

Colloidal precipitates01:09

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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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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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Polymer Brush-Induced Hollow Colloids via Diffusion-Controlled Silication.

Lei Tian1,2, Bei Li1, Qiuyu Zhang1

  • 1Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an 710072, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 15, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create asymmetrical hollow colloidal particles using controlled polymer brush desolvation. This technique allows for tunable cavity shapes and facilitates nanocrystal synthesis.

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Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Nanotechnology

Background:

  • Synthesizing hollow colloidal particles with controlled shapes is challenging.
  • Polymer brushes offer potential for surface modification and cavity formation.
  • Limited chemical diffusion is a key factor in particle morphology.

Purpose of the Study:

  • To introduce a new strategy for synthesizing asymmetrical hollow colloidal particles.
  • To elucidate the mechanism of cavity formation via polymer brush desolvation.
  • To demonstrate the tunability of cavity shapes and properties.

Main Methods:

  • Utilizing a solvated polymer brush (poly(glycidyl methacrylate)) on particle surfaces.
  • Employing limited chemical diffusion at the polymer brush periphery.
  • Partial cross-linking under Stöber conditions during silication.
  • Inducing desolvation to create internal cavities.

Main Results:

  • Successfully synthesized asymmetrical hollow colloidal particles.
  • Demonstrated tunable cavity morphologies including hemispherical and crescent shapes.
  • Observed wrinkled surfaces on synthesized particles.
  • Showcased preferred particle orientation due to shape and composition.

Conclusions:

  • The developed strategy offers a versatile route to asymmetrical hollow colloidal particles.
  • Tunable cavity structures can be achieved by controlling polymer brush desolvation.
  • The hollow particles' orientation facilitates confined nanocrystal synthesis.