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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...
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...
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...

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Related Experiment Video

Updated: Jun 3, 2026

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays
11:03

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

Published on: March 9, 2021

Multiple pickering emulsions stabilized by microbowls.

Yoshimune Nonomura1, Naoto Kobayashi, Naoki Nakagawa

  • 1Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan. nonoy@yz.yamagata-u.ac.jp

Langmuir : the ACS Journal of Surfaces and Colloids
|March 23, 2011
PubMed
Summary

Hollow microparticles with surface holes enable the creation of complex, stable emulsions like potato- or coffee-bean shapes. This breakthrough in Pickering emulsions expands possibilities for advanced materials in various industries.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Supracolloidal Assembly

Background:

  • Pickering emulsions and foams utilize solid particle adsorption at fluid interfaces.
  • Research on Pickering emulsions primarily focuses on simple spherical structures.
  • Formation of complex, non-spherical emulsion structures remains underexplored.

Purpose of the Study:

  • To investigate the role of particle surface features in creating complex emulsion structures.
  • To demonstrate the capability of microbowls (hollow particles with holes) in forming diverse emulsions.
  • To explore the potential of these complex emulsions in advanced material design.

Main Methods:

  • Utilized microbowls, hollow particles with surface holes, as emulsifying agents.
  • Employed simple mixing of microbowls with water and oil phases.
  • Characterized the resulting emulsion structures, including multiple and non-spherical forms.

Main Results:

  • Microbowls successfully formed multiple emulsions (water-in-oil-in-water and oil-in-water-in-oil).
  • Stable, complex non-spherical emulsions resembling potato and coffee beans were achieved.
  • Particle surface topography, specifically holes, was identified as crucial for structural complexity.

Conclusions:

  • Surface holes in particles are key to generating diverse and complex mesoscale structures.
  • Microbowls offer a novel route to creating stable, non-spherical Pickering emulsions.
  • Findings provide a foundation for designing building blocks for supracolloidal systems in pharmaceuticals, food, and cosmetics.