Conversion of uranium hexafluoride and recovery of uranium from ionic liquids
Described are methods for the recovery of uranium from uranium hexafluoride dissolved directly into ionic liquids.
Hatchett, David W.↗
Engineering topics
Czerwinski, Kenneth R.
Publications and source records attributed to Czerwinski, Kenneth R..
Conversion of uranium hexafluoride and recovery of uranium from ionic liquids
Described are methods for the recovery of uranium from uranium hexafluoride dissolved directly into ionic liquids.
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEA↗
Solvothermal synthesis and solid-state characterization of metal-metal bonded tetracarboxylatoditechnetium(II,III) polymers
Investigations of solvothermal reactions with pertechnetate, [TcO 4 ] - , have produced four new low-valent Tc extended metal atom chain (EMAC) complexes with multiple metal-metal bonds. The thermal reaction of potassium pertechnetate with glacial acetic acid, under in-situ hydrogen production from the decomposition of sodium borohydride, yields purple elongated crystals determined to be tetraacetato ditechnetium (II,III) acetate (1), [Tc 2 (O 2 CCH 3 ) 4 (μ-O 2 CCH 3 ] n . Compound 1 was characterized by single crystal X-ray diffraction and its magnetic properties recorded between 10 and 300 K. Single crystal X-ray diffraction analysis of 1 indicates the Tc 2 +5 tetraacetato unit is linked by the carboxylate oxygens of the bridging acetate, similar to known chloride and bromide linkage polymers of composition [Tc 2 (μ-O 2 CCH 3 ) 4 Cl] n , and [Tc 2 (μ-O 2 CCH 3 ) 4 Br] n . Here, using the same synthetic method three similar compounds have been synthesized from propionic, benzoic and pivalic acid.
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
An Americium-Containing Metal-Organic Framework: A Platform for Studying Transplutonium Elements
The synthesis, structural and spectroscopic characterization of the first transplutonium metal-organic framework (MOF) is described. The preparation and structure of Am GWMOF-6, [Am2(C6H8O4)3(H2O)2][(C10H8N2)], is analogous to that of the isostructural trivalent lanthanide-only containing material GWMOF-6. The presented MOF architecture is used as a plat-form to probe Am3+ coordination chemistry and guest-enhanced luminescent emission, whereas the framework itself provided a means to monitor the effects of self-irradiation upon crystallinity over time. Presented here is a discussion of these properties and the opportunities that metal-organic frameworks provide in the structural and spectroscopic study of actinides.
Ridenour, James A.↗
An Americium‐Containing Metal–Organic Framework: A Platform for Studying Transplutonium Elements
Abstract The synthesis, structure, and spectroscopic characterization of the first transplutonium metal–organic framework (MOF) is described. The preparation and structure of Am‐GWMOF‐6, [Am 2 (C 6 H 8 O 4 ) 3 (H 2 O) 2 ][(C 10 H 8 N 2 )], is analogous to that of the isostructural trivalent lanthanide‐only containing material GWMOF‐6. The presented MOF architecture is used as a platform to probe Am 3+ coordination chemistry and guest‐enhanced luminescent emission, whereas the framework itself provides a means to monitor the effects of self‐irradiation upon crystallinity over time. Presented here is a discussion of these properties and the opportunities that MOFs provide in the structural and spectroscopic study of actinides.
Ridenour, J. August↗
Dual flask
This document provides a dual flask for laboratory use, methods of using a dual flask, and systems including a dual flask. A dual flask can include a first flask structure and a second flask structure. Each flask structure can include a body and a neck. The first body and the second body in a dual flask provided herein can be connected together and have a filter there between such that fluids can be filtered between said first and second bodies.
Rego, Daniel↗
Irradiation and isolation of fission products from uranium metal–organic frameworks
Typical fission product formation experiments utilize metal or oxide target materials that must be dissolved prior to product separation. In this study, we report here a novel study using metal–organic frameworks for recovery of fission products into acidic media. We further show that the frameworks are largely preserved, such that this bulk target material could be retained for additional irradiations or characterizations. Through this approach, fission products can be separated from the actinide-based metal–organic framework using 0.01 M HNO 3 without the need to dissolve the framework itself, reducing the amount of acidic waste. Extraction yields of four frameworks with varying pore sizes are compared. In conclusion, the results suggest that it may be possible to use porous frameworks as target materials for the extraction of select fission products.
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEA↗
A UO 2 -based salt target for rapid isolation of fission products
Here, we report here an initial isolation study based upon the use of small uranium oxide particles dispersed in a soluble salt matrix to evaluate the relative recovery of fission products into acidic media. We further show that the macrostructures of the uranium microparticles are largely preserved, such that the bulk target material could be retained for additional irradiations or characterizations. Through this approach, fission products can be separated from the actinide-based target using low molarities of acid without the need to dissolve the actinide itself, reducing the amount of acidic waste. Extraction yields using two molarities of HCl and HNO 3 are compared.
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEA↗