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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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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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CO2-Responsive Wormlike Micelles Based on Pseudo-Tetrameric Surfactant.

Xia Wei1,2, Xiran He1, Dongmei Zhang1

  • 1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China.

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|November 26, 2022
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Summary

Researchers developed novel CO2-switchable worm-like micelles using stearic acid and cyclen. These environmentally friendly micelles offer tunable viscoelastic properties, switching between fluid and gel states.

Keywords:
CO2 switchingcyclentetrameric surfactantviscositywormlike micelles

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Rheology

Background:

  • Worm-like micelles are linear surfactant aggregates that form viscoelastic networks.
  • Stimuli-responsive materials are crucial for advanced applications.
  • Carbon dioxide (CO2) is an ideal, eco-friendly trigger due to its abundance and non-toxicity.

Purpose of the Study:

  • To develop novel CO2-switchable surfactants and worm-like micelles.
  • To investigate the self-assembly and rheological properties of these CO2-responsive systems.
  • To demonstrate efficient switching between low-viscosity and viscoelastic states.

Main Methods:

  • Simple mixing of commercial stearic acid and cyclen to form pseudo-tetrameric surfactants.
  • Self-assembly of surfactants into worm-like micelles triggered by CO2.
  • Rheological measurements to characterize viscoelastic properties.

Main Results:

  • Successful formation of CO2-switchable pseudo-tetrameric surfactants.
  • Demonstrated self-assembly into CO2-switched worm-like micelles.
  • Rheological switching between a low-viscosity fluid (1.2 mPa·s) and a viscoelastic fluid (3000 mPa·s) using CO2.

Conclusions:

  • This study presents an efficient and environmentally friendly method for creating CO2-switchable worm-like micelles.
  • The developed system exhibits tunable viscoelasticity, expanding the field of stimuli-responsive materials.
  • The facile synthesis and reversible switching offer potential for various applications.