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Filtering by: Alternative title ssim The redox chemistry of neptunium in gamma-irradiated aqueous nitric acid in the presence of an organic phase Remove constraint Alternative title ssim: The redox chemistry of neptunium in gamma-irradiated aqueous nitric acid in the presence of an organic phase Decade 2010-2019 Remove constraint Decade: 2010-2019 Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • The kinetic and radiolytic aspects of control of the redox speciation of neptunium in solutions of nitric acid

    Creator:
    Precek, Martin
    Abstract:
    Neptunium, with its rich redox chemistry, has a special position in the chemistry of actinides. With a decades-long history of development of aqueous separation methods for used nuclear fuel (UNF), management of neptunium remains an unresolved issue because of its not clearly defined redox speciation. Neptunium is present in two,...
    Resource Type:
    Dissertation
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    Redox Speciation of Neptunium in Solutions of Nitric Acid AN ABSTRACT OF THE DISSERTATION OF

  • Aqueous complexation of citric acid and DTPA with selected trivalent and tetravalent f-elements

    Creator:
    Brown, M. Alex
    Abstract:
    Carboxylic acids have played an important role in the field of actinide (An) and lanthanide (Ln) separations and the reprocessing of irradiated nuclear fuel. Recent bench-scale experiments have demonstrated that 3-carboxy-3-hydroxypentanedioic acid (citric acid) is a promising aqueous complexant that can effectively aid in the separation of transition metals from...
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    Dissertation
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    An and Ln into the organic phase followed be selective stripping of An(III) into the aqueous

  • The chemistry of acetohydroxamic acid related to nuclear fuel reprocessing

    Creator:
    Matteson, Brent Searle
    Abstract:
    Used Nuclear Fuel (UNF) contains transuranic (TRU) elements and numerous fission products as a result of the uranium fission process and neutron activation that occur in commercial light water power reactors. Recent environmental and nuclear proliferation concerns have spawned the development of advanced reprocessing techniques to close the nuclear fuel...
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    Dissertation
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    AHA in nitric acid, which is the typical aqueous phase medium for UNF reprocessing. The results of

  • Organic Phase Inter-Ligand and Metal-Ligand Speciation in TALSPEAK and ALSEP Solvent Extraction Systems

    Creator:
    Gullekson, Brian J.
    Abstract:
    Partitioning of trivalent actinides (in particular, americium and curium) from the fission produced light lanthanides is a major concern of used nuclear fuel reprocessing for the purposes of waste disposal. Several solvent extraction processes have been developed to address these chemically difficult separations. The historically employed TALSPEAK Process utilizes di-2-ethylhexyl...
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    Dissertation
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    species x in the organic phase, and “cx,aq” is the concentration of species x in the aqueous phase

  • Aqueous niobium chemistry at low pH : new precursors for oxide thin films

    Creator:
    Park, Deok-Hie
    Abstract:
    Phosphate and peroxide stabilize new oxo-hydroxo niobium clusters in water at low pH. The clusters open a new chapter in aqueous niobium chemistry under acidic conditions. The clusters also produce atomically smooth, amorphous niobium oxide phosphate (NbPOx) thin films. Reaction pathways from cluster solutions to amorphous niobium oxide phosphate solids...
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    Dissertation
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    for the degree of Doctor of Philosophy in Chemistry presented on June 14, 2017. Title: Aqueous

  • New chemistry for electrochemical energy storage applications

    Creator:
    Wang, Xingfeng
    Abstract:
    Electrochemical capacitors and batteries are two major electrochemical energy storage technologies, which have been investigated extensively to meet the rapidly-growing demand for higher energy, higher power, lower cost and enhanced safety in the past few decades. With the charge storage mechanism of electrostatic charge adsorption desorption via electrical double layers,...
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    Dissertation
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    anode metal. Cathode covering the dielectric could be in either liquid phase, e.g. aqueous/organic

  • On the Properties and Characteristics of Solution Processed Hafnium Based Thin-Films from Aqueous Precursors

    Creator:
    Decker, Shawn R.
    Abstract:
    Aqueous hydroxo Hf nanoclusters enable studies to identify and codify steps in the deposition of Hf-based oxide thin films from solution precursors. HfOCl2 reacts with combinations of H2O2(aq), acids, and TMAH to produce polymetal species at high pH and low pH. X-ray scattering and spectroscopic methods reveal the nature of...
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    Dissertation
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    in electronics [26] as an oxide, the chemistry of hafnium has contributed to many of the

  • Organic/Inorganic Hybrid Materials of Uranyl Peroxide Clusters and Uranium Minerals

    Creator:
    Neal, Harrison A.
    Abstract:
    Frontier research of non-aqueous actinide clusters is discussed. Since the inception of the uranyl peroxide clusters over the last decade, they have only been synthesized and characterized as solid crystals and in aqueous solution. This thesis provides thorough characterization of aqueous uranyl clusters and the first demonstration of uranyl cluster...
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    Dissertation
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    the degree of Doctor of Philosophy in Chemistry presented on June 7, 2018. Title: Organic

  • Investigation of mixed N,O-donor dipicolinamide derivative ligands for use in nuclear fuel separations

    Creator:
    Lapka, Joseph
    Abstract:
    In this work, three isomeric forms of N, N'-diethyl, N, N'-ditolyldipicolinamide (EtTDPA) were synthesized. The elements thorium through americium, which make up a significant portion of the actinides in used nuclear fuel (with the exception of curium), and two fission products, molybdenum and technetium, were tested for their ability to...
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    Dissertation
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    : Effect of organic phase nitric acid content on CF3 radical substitution ....... 118 Figure 5.10

  • Development of Carbon-based Ion Selective Microsensors as Scanning Electrochemical Microscopy (SECM) Probes

    Creator:
    Ummadi, Jyothir Ganeshwar Reddy
    Abstract:
    The general theme of this dissertation is the application of novel carbon based micro sensors with the scanning electrochemical microscopy (SECM). SECM allows positioning of the probe without touching the substrate while mapping the chemical parameters in 3D space above the substrate. The main focus of the dissertation is the...
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    Dissertation
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    Figure 1.5 ISE immersed in an aqueous solution containing an analyte C+. The ISE membrane is made of an