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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...
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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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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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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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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Clay-based colloidosomes.

Mark Williams1, S P Armes, David W York

  • 1Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire, S3 7HF United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 8, 2011
PubMed
Summary
This summary is machine-generated.

Poly(ethylene imine) (PEI) adsorbed onto Laponite nanoparticles creates stable Pickering emulsions. These hybrid particles can be transformed into robust colloidosomes, though they show high permeability for small molecules.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Poly(ethylene imine) (PEI) is a versatile polymer with amine groups.
  • Laponite is a synthetic clay nanoparticle with a large surface area.
  • Pickering emulsions are stabilized by solid particles.

Purpose of the Study:

  • To develop an efficient hybrid Pickering emulsifier using PEI-modified Laponite nanoparticles.
  • To investigate the performance of these hybrid emulsifiers for various oils.
  • To explore the conversion of these Pickering emulsions into clay-based colloidosomes.

Main Methods:

  • Adsorption of PEI onto Laponite nanoparticles from aqueous solution.
  • Formation of oil-in-water Pickering emulsions via homogenization.
  • Characterization using aqueous electrophoresis, thermogravimetric analysis, and laser diffraction.
  • Conversion into colloidosomes using diglycidyl ether cross-linkers.
  • Microscopy and dye release studies for colloidosome evaluation.

Main Results:

  • Stable sunflower oil-in-water Pickering emulsions were formed with optimized PEI/Laponite ratios.
  • Minimum droplet diameter of ~60 μm achieved at 0.50% Laponite and 0.50 PEI/Laponite mass ratio.
  • Emulsions showed long-term stability against coalescence but creaming due to large droplet size.
  • Clay-based colloidosomes were successfully synthesized and robust enough to withstand oil phase removal.
  • Colloidosomes exhibited high permeability, limiting their use for small molecule encapsulation.

Conclusions:

  • PEI-modified Laponite nanoparticles serve as effective Pickering emulsifiers.
  • The resulting Pickering emulsions can be converted into stable, albeit permeable, clay-based colloidosomes.
  • Further modification may be needed to enhance the barrier properties of these colloidosomes for specific applications.