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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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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Forming Giant-sized Polymersomes Using Gel-assisted Rehydration
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Forming Giant-sized Polymersomes Using Gel-assisted Rehydration

Published on: May 26, 2016

Can polymersomes form colloidosomes?

Kate L Thompson1, Pierre Chambon, Robert Verber

  • 1Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, South Yorkshire, UK. k.l.thompson@sheffield.ac.uk

Journal of the American Chemical Society
|July 20, 2012
PubMed
Summary
This summary is machine-generated.

Hydroxy-functionalized polymersomes stabilize Pickering emulsions. Cross-linking is crucial for polymersome integrity and the formation of stable colloidosomes, demonstrating their potential in emulsion stabilization.

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Area of Science:

  • Polymer Chemistry
  • Colloid Science
  • Materials Science

Background:

  • Polymersomes, or block copolymer vesicles, are self-assembled nanostructures with potential applications in stabilization.
  • Pickering emulsions are stabilized by solid particles, offering an alternative to traditional surfactants.

Purpose of the Study:

  • To investigate the efficacy of hydroxy-functionalized polymersomes as Pickering emulsifiers.
  • To explore the role of cross-linking in maintaining polymersome structure during emulsification.
  • To assess the formation of colloidosomes using polymersomes.

Main Methods:

  • One-pot RAFT aqueous dispersion polymerization for polymersome synthesis.
  • Preparation and characterization of Pickering emulsions using n-dodecane in water.
  • Transmission Electron Microscopy (TEM) for structural analysis.
  • Optical and fluorescence microscopy for emulsion evaluation.

Main Results:

  • Linear polymersomes failed to stabilize emulsions effectively, leading to polydisperse droplets stabilized by individual polymer chains.
  • Cross-linked polymersomes formed stable n-dodecane-in-water Pickering emulsions, with droplet size dependent on polymersome concentration.
  • Diisocyanate cross-linking at the oil/water interface resulted in the formation of well-defined colloidosomes.

Conclusions:

  • Polymersomes require sufficient cross-linking to withstand emulsification processes and effectively stabilize emulsions.
  • Cross-linked polymersomes can serve as building blocks for the formation of stable colloidosomes.
  • This study highlights the importance of structural integrity for polymersomes acting as Pickering emulsifiers and in colloidosome formation.