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Related Experiment Videos

Phase behavior of CO2-expanded fluorinated microemulsions.

Yeh Wei Kho1, Daniel C Conrad, Barbara L Knutson

  • 1Department of Chemical & Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 20, 2005
PubMed
Summary

This study demonstrates the formation of carbon dioxide (CO2)-expanded fluorinated reverse microemulsions using perfluoropolyether (PFPE) components. CO2 is essential for microemulsion formation in this PFPE system, influencing phase behavior under varying conditions.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Colloid and Surface Science

Background:

  • Perfluoropolyether (PFPE) based systems are explored for unique solvent properties.
  • Reverse microemulsions offer potential in specialized applications, but their formation in fluorinated systems is challenging.
  • Carbon dioxide (CO2) is investigated as a co-solvent to stabilize fluorinated microemulsions.

Purpose of the Study:

  • To demonstrate the formation of CO2-expanded, fluorinated reverse microemulsions.
  • To investigate the phase behavior of PFPE surfactant/oil systems with CO2.
  • To determine the conditions required for stable microemulsion formation.

Main Methods:

  • System composition: perfluoropolyether (PFPE) surfactant (ClPFPE-NH4) and PFPE oil.

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  • Phase behavior analysis as a function of temperature, pressure, CO2 concentration, and water-to-surfactant ratio (W0).
  • Spectroscopic measurements to confirm the presence of a bulk water environment.

    • Main Results:

    • Successful formation of CO2-expanded, fluorinated reverse microemulsions was demonstrated.
    • Microemulsion formation was not observed without CO2; >70 mol% CO2 was required.
    • Cloud point pressures increased with temperature, water loading, and CO2 content, with the lowest observed at 46 bar.

    Conclusions:

    • CO2 is a critical component for forming reverse microemulsions in this PFPE system.
    • The phase behavior is sensitive to temperature, pressure, CO2 concentration, and water loading.
    • Understanding these parameters is key for designing CO2-expanded fluorinated microemulsions.