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This study introduces novel carbon dioxide (CO2)-responsive worm-like micelles (WLMs) using a double-tailed surfactant. These micelles exhibit dramatic viscosity changes, offering potential for smart materials and enhanced oil recovery.

Keywords:
CO2-responsivenessdouble-tailed surfactantviscosityworm-like micelle

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Supramolecular Chemistry

Background:

  • Carbon dioxide (CO2)-responsive worm-like micelles (WLMs) are valuable for smart materials due to tunable properties.
  • Applications include enhanced oil recovery and drug delivery systems.

Purpose of the Study:

  • To develop a novel system of CO2-responsive WLMs using a double-tailed surfactant (DTS).
  • To characterize the viscosity, thermal stability, and responsiveness of the DTS-CO2 system.

Main Methods:

  • Self-assembly of double-tailed surfactants (DTS) in response to CO2 exposure.
  • Rheological measurements to determine zero-shear viscosity and temperature dependence.
  • Cyclic testing to assess responsiveness and stability.

Main Results:

  • Protonation of DTS in CO2 forms ultra-long cationic surfactants self-assembling into WLMs.
  • Zero-shear viscosity increased from 2 mPa·s (DTS-air) to ~300,000 mPa·s (DTS-CO2).
  • High viscosity (>100,000 mPa·s) was maintained from 25-120 °C under CO2, with reversible transitions observed over multiple cycles.

Conclusions:

  • The DTS-CO2 system demonstrates significant, reversible viscosity changes in response to CO2.
  • This research provides insights for developing advanced CO2-responsive surfactants for functional materials.