Micelle Formation and Surface Interactions in Supercritical CO2. Fundamental Studies for the Extraction of Actinides from Contaminated Surfaces.

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Description

The goals of this research program included: (1) Study solubility of extractants and formation of micelles--(a) Do surfactants form micelles in scCO{sub 2} and what is the mechanism of their formation? (b) Can the pressure/density of scCO{sub 2} be used to alter surfactant solubility or micelle structure? (c) Can surfactant micelles be used to transport water based microphases? (2) Examine the solubilization of metals--(a) What influence does metal binding have on the surfactant solubility or micelle structure? (b) What is the selectivity of metal binding in promising systems? (c) Are all solubilized metals bound to surfactant ligands or is an ... continued below

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21 pages

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McCleskey, T Mark & Birnbaum, Eva R. September 30, 2001.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Los Alamos, NM (United States)
    Place of Publication: Los Alamos, New Mexico

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Description

The goals of this research program included: (1) Study solubility of extractants and formation of micelles--(a) Do surfactants form micelles in scCO{sub 2} and what is the mechanism of their formation? (b) Can the pressure/density of scCO{sub 2} be used to alter surfactant solubility or micelle structure? (c) Can surfactant micelles be used to transport water based microphases? (2) Examine the solubilization of metals--(a) What influence does metal binding have on the surfactant solubility or micelle structure? (b) What is the selectivity of metal binding in promising systems? (c) Are all solubilized metals bound to surfactant ligands or is an entire aqueous micro-environment solubilized by the surfactant/micelle? (d) Can metal species, as charged ions or neutral complexes, be insulated by fluorinated surfactants to enhance solubility in scCO{sub 2}? (3) Explore surface interactions with the matrix and mobility of micelles.--(a) What factors affect wetting of heterogeneous matrices (i.e., ligand type, CO{sub 2} pressure); (b) How deep can surfactants penetrate materials such as concrete? (4) Explore surface interactions with the actinide contaminant--(a) Can surfactant based micelles be used to deliver acidic, aqueous microphases to the actinide surface? (5) Evaluate these new systems for metal extraction from a model contaminated surface containing radionuclides or surrogate metals--(a) What is the rate of extraction? (b) What ratio of ligand to metal is required?

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21 pages

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  • Other Information: PBD: 30 Sep 2001

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  • September 30, 2001

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 21, 2016, 6:40 p.m.

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McCleskey, T Mark & Birnbaum, Eva R. Micelle Formation and Surface Interactions in Supercritical CO2. Fundamental Studies for the Extraction of Actinides from Contaminated Surfaces., report, September 30, 2001; Los Alamos, New Mexico. (digital.library.unt.edu/ark:/67531/metadc782719/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.