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Related Concept Videos

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

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Polyamine-functional sterically stabilized latexes for covalently cross-linkable colloidosomes.

A Walsh1, K L Thompson, S P Armes

  • 1Dainton Building, Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 11, 2010
PubMed
Summary
This summary is machine-generated.

Chemically grafted poly(ethylene imine) (PEI) stabilizers improve polystyrene latex production, creating smaller particles and stable Pickering emulsions. Cross-linking these stabilizers forms robust colloidosomes, useful for encapsulation applications.

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Area of Science:

  • Colloid and Surface Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Sterically stabilized polymer latexes are crucial in various applications, including Pickering emulsions and colloidosomes.
  • Poly(ethylene imine) (PEI) is a potential stabilizer, but its grafting efficiency and performance can be limited.
  • In situ modification of stabilizers can enhance their performance and enable new functionalities.

Purpose of the Study:

  • To develop a method for chemically grafting poly(ethylene imine) (PEI) onto polystyrene latex particles.
  • To investigate the formation and properties of Pickering emulsions stabilized by modified PEI.
  • To explore the creation of robust colloidosomes via cross-linking of the grafted PEI stabilizer.

Main Methods:

  • Aqueous emulsion polymerization of styrene using poly(ethylene imine) (PEI) and 4-vinylbenzyl chloride (4-VBC) for in situ grafting.
  • Characterization of grafted PEI and polystyrene particles using electrophoresis, XPS, and nitrogen microanalysis.
  • Preparation of Pickering emulsions and colloidosomes using various model oils and cross-linking agents (PPG-TDI, PPG-DGE, PEG-DGE).

Main Results:

  • 4-VBC modification significantly improved PEI grafting efficiency and resulted in smaller polystyrene particles.
  • Partially quaternized PEI effectively stabilized oil-in-water Pickering emulsions with four model oils at pH 9.
  • Cross-linking with PPG-TDI, PPG-DGE, or PEG-DGE yielded robust colloidosomes with varying oil compatibility and cross-linking kinetics.

Conclusions:

  • In situ chemical grafting of PEI onto polystyrene latexes enhances particle formation and emulsion stabilization.
  • The resulting modified latexes are effective emulsifiers for creating stable Pickering emulsions.
  • Cross-linking of grafted PEI provides a versatile route to robust colloidosomes for potential encapsulation applications.