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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

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Published on: November 5, 2014

Carbon dioxide-in-water microemulsions.

C Ted Lee¹, Won Ryoo, P Griffin Smith

¹Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA.

Journal of the American Chemical Society

|March 6, 2003

Summary

Carbon dioxide swells PFPE-K micelles in water, forming novel CO(2)-in-water microemulsions. These microemulsions enhance pyrene solubility and can solubilize both lipophilic and fluorophilic substances.

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Area of Science:

Colloid and Surface Science
Materials Chemistry
Physical Chemistry

Background:

Perfluoropolyether carboxylates (PFPE-K) form cylindrical micelles in aqueous solutions.
Carbon dioxide (CO(2)) can interact with and modify micellar structures.

Purpose of the Study:

To investigate the effect of liquid and supercritical CO(2) on PFPE-K micelles.
To characterize the resulting CO(2)-in-water (C/W) microemulsions.
To assess the solubilization capabilities of these novel microemulsions.

Main Methods:

Formation of PFPE-K micelles in water.
Swelling of micelles using liquid and supercritical CO(2).
Analysis of micelle dimensions via fluorescence spectroscopy.
Determination of pyrene solubility.
Investigation of pyrene localization within the microemulsion.

Main Results:

CO(2) significantly swells PFPE-K micelles from 20 nm to 80 nm at a CO(2):surfactant ratio (R(CO2)) of approximately 8.
Pyrene solubility increases approximately 10-fold in the swollen micelles (C/W microemulsions).
Fluorescence data indicate pyrene primarily partitions to the micelle core.

Conclusions:

Novel CO(2)-in-water (C/W) microemulsions are formed by swelling PFPE-K micelles with CO(2).
These C/W microemulsions exhibit enhanced solubilization capacity for lipophilic substances like pyrene.
The study demonstrates the potential of C/W microemulsions for simultaneous solubilization of lipophilic and fluorophilic compounds.