Small angle X-ray scattering studies of reverse micelles in supercritical fluids
The nature of aggregates formed in a supercritical fluid determines its solvent power and selectivity. Small angle X-ray scattering (SAXS) is a powerful tool for studying the properties of aggregates with sizes in the 10{angstrom} to 200{angstrom} range. It is also useful in studying those interparticle interactions which operate over a similar distance. The authors have used SAXS to examine the aggregates formed in pure fluids, in mixtures and in fluid/surfactant/water systems. The scattered intensity as a function of angle depends on the geometry, polydispersity, X-ray contrast, and interaction strength of the particles as well as on the phase behavior of the system. In this paper the authors present the results of modeling the X-ray scattering from AOT/water reverse micelles in supercritical propane and in propane/carbon dioxide mixtures. They examine the effect of dilution with CO{sub 2} anti-solvent on the phase behavior of the system and on the strength of intermicellar attractions. A better understanding of these systems must be obtained before the applications of supercritical reverse micelle systems to extractions, reactions, and enhanced oil recovery can be fully developed.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 28247
- Report Number(s):
- PNL-SA-25782; CONF-9410114-6; ON: DE95007803; TRN: AHC29510%%52
- Resource Relation:
- Conference: 3. international symposium on supercritical fluids, Strasbourg (France), 17-19 Oct 1994; Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
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