Small angle X-ray scattering studies of reverse micelles in supercritical fluids

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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 ... continued below

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10 p.

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Pfund, D. M. & Fulton, J. L. October 1, 1994.

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  • Pacific Northwest Laboratory
    Publisher Info: Pacific Northwest Lab., Richland, WA (United States)
    Place of Publication: Richland, Washington

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Description

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.

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10 p.

Notes

OSTI as DE95007803

Source

  • 3. international symposium on supercritical fluids, Strasbourg (France), 17-19 Oct 1994

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  • Other: DE95007803
  • Report No.: PNL-SA--25782
  • Report No.: CONF-9410114--6
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/28247 | External Link
  • Office of Scientific & Technical Information Report Number: 28247
  • Archival Resource Key: ark:/67531/metadc669546

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  • October 1, 1994

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 7, 2016, 3:12 p.m.

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Pfund, D. M. & Fulton, J. L. Small angle X-ray scattering studies of reverse micelles in supercritical fluids, report, October 1, 1994; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc669546/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.