Reverse micelles in supercritical fluids. (2) Fluorescence and absorption spectral probes of adjustable aggregation in the two-phase region
- Univ. of Texas, Austin (USA)
The properties of bis(2-ethylhexyl) sodium sulfosuccinate (AOT) reverse micelles and microemulsions in supercritical fluid (SCF) ethane, liquid propane, and other alkanes are reported. The microscopic environment inside the reverse micelles was investigated with the absorption probe pyridine N-oxide and the fluorescence probe 8-anilino-1-naphthalenesulfonic acid (ANS). The microscopic behavior is related directly to a macroscopic property, the water-to-surfactant ratio W{sub o}. In the one-phase region, a reverse micelle in a SCF is much like that in a liquid solvent. However, in the two-phase region, both the microscopic and macroscopic properties may be adjusted with pressure in ethane and propane, because of changes in the partitioning of the components between the phases.
- OSTI ID:
- 5434075
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 94:18; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
ABSORPTION
ALKANES
CHROMATOGRAPHY
COLLOIDS
CRYSTAL STRUCTURE
DISPERSIONS
EMISSION SPECTROSCOPY
EMULSIONS
ETHANE
FLUORESCENCE SPECTROSCOPY
HYDROCARBONS
MICELLAR SYSTEMS
MICROEMULSIONS
MICROSTRUCTURE
ORGANIC COMPOUNDS
PHASE STUDIES
SEPARATION PROCESSES
SPECTROSCOPY
SUPERCRITICAL FLUID CHROMATOGRAPHY