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Related Concept Videos

Colloids03:22

Colloids

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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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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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The Colloidal State01:29

The Colloidal State

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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...
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The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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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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Updated: Apr 15, 2026

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays
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Anisotropic particles templated by Janus emulsion.

Lingling Ge1, Shuhui Lu, Jie Han

  • 1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, China. llge@yzu.edu.cn guorong@yzu.edu.cn.

Chemical Communications (Cambridge, England)
|April 14, 2015
PubMed
Summary

Researchers created anisotropic particles, ranging from crescent to moon shapes and micrometer to nanometer sizes, using Janus emulsions. This method also enables the synthesis of Janus particles with different chemical properties on each hemisphere.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid Science

Background:

  • Anisotropic particles exhibit unique properties due to their non-spherical shape.
  • Janus particles, with distinct surface chemistries, are crucial for advanced applications.
  • Controlled fabrication of anisotropic and Janus particles at scale remains a challenge.

Purpose of the Study:

  • To develop a scalable method for fabricating anisotropic particles.
  • To utilize Janus emulsions as a template for particle synthesis.
  • To demonstrate the versatility of the method for creating Janus particles with distinct hemispheres.

Main Methods:

  • Utilizing Janus emulsions as sacrificial templates.
  • Batch-scale fabrication of anisotropic particles.
  • Characterization of particle morphology and size distribution.

Main Results:

  • Successfully fabricated anisotropic particles with morphologies ranging from crescent to moon shapes.
  • Achieved control over particle size from micrometer to nanometer scales.
  • Demonstrated the synthesis of Janus particles with chemically distinct hemispheres using the same strategy.

Conclusions:

  • The proposed method provides a scalable route for producing anisotropic particles.
  • Janus emulsions are effective templates for synthesizing complex particle architectures.
  • The developed strategy offers a versatile platform for creating functional Janus particles.