A5061693965- Radioactive element chemistry and processing
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Radioactive contamination and transfer
- Crystallography and molecular interactions
- Nuclear Materials and Properties
- Analytical chemistry methods development
- Lanthanide and Transition Metal Complexes
- Chemical Synthesis and Characterization
- Laser-induced spectroscopy and plasma
- Geochemistry and Elemental Analysis
- Nuclear materials and radiation effects
- Polyoxometalates: Synthesis and Applications
- Vanadium and Halogenation Chemistry
- Chemical and Physical Properties in Aqueous Solutions
- Nuclear Physics and Applications
- Extraction and Separation Processes
- Graphite, nuclear technology, radiation studies
- Crystal Structures and Properties
- Mass Spectrometry Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Luminescence Properties of Advanced Materials
- Radioactive Decay and Measurement Techniques
- Cultural Heritage Materials Analysis
- Isotope Analysis in Ecology
Los Alamos National Laboratory
2017-2022
Los Alamos Medical Center
2017
University of Notre Dame
2012-2016
Clemson University
2016
Notre Dame of Dadiangas University
2015
Uranyl peroxide cluster species were produced in aqueous solution by the treatment of uranyl nitrate with hydrogen peroxide, lithium hydroxide, and potassium chloride. Ultrafiltration these using commercial sheet membranes molecular mass cutoffs 3, 8, 20 kDa (based on polyethylene glycol) resulted U rejection values 95, 85, 67% mass, respectively. untreated solutions virtually no U. These results demonstrate ability to use filtration as a means for separating from basis size. Small-angle...
A portable handheld laser-induced breakdown spectroscopy (HH LIBS) instrument was evaluated as a rapid method to qualitatively analyze rare earth elements in uranium oxide matrix. This research is motivated by the need for development of perform rapid, at-line chemical analysis nuclear facility, particularly provide first pass determine if additional actions or measurements are warranted. will result minimization handling and transport radiological material subsequent exposure their...
Uranyl vanadate sulfate clusters isolated from a mixture of water and ionic liquid present structure intermediate between those typical transition metal polyoxometalates uranyl peroxide cage clusters.
The integration of the liquid sampling-atmospheric pressure glow discharge (LS-APGD) ion source with Orbitrap mass spectrometers has resulted in new opportunities field isotope ratio spectrometry. In a that been dominated by thermal ionization spectrometry (TIMS) and inductively coupled plasma (ICP-MS) on quadrupole scanning-mode sector analyzer platforms for highly accurate precise measurements, LS-APGD-Orbitrap system offers benchtop instrument capable meeting rigorous International Target...
Laser ablation – inductively coupled plasma mass spectrometry (LA-ICP-MS) in tandem with laser induced breakdown spectroscopy (LIBS) was employed to chemically map and characterize uranium particles.
The first four uranyl peroxide compounds containing ethylenediaminetetra-acetate (EDTA) were synthesized and characterized from aqueous nitrate solutions with a pH range of 5–7. Raman spectra demonstrated that reaction crystallized [NaK15[(UO2)8(O2)8(C10H12O10N2)2(C2O4)4]·(H2O)14] (1) [Li4K6[(UO2)8(O2)6(C10H12O10N2)2(NO3)6]·(H2O)26] (2) contained excess peroxide, their structures oxidized ethylenediaminetetraacetate, EDTAO24–. which [K4[(UO2)4(O2)2(C10H13O8N2)2(IO3)2]·(H2O)16] (3)...
Three uranyl selenates, one mixed selenate-selenite, and two selenite compounds have been synthesized using mild hydrothermal techniques. The structure of each has determined single-crystal diffraction data collected with Mo K αX-ray radiation an APEX CCD-based detector. isotypic ( 1 ) Cs 2 Ni 3 (H O) 4 [(UO 8 (SeO O ] Co are monoclinic, space group C 2/ c , cell parameters a 8.755(3), b 14.228(5), 17.927(8) A, β103.739(3)° 8.744(2), 14.380(4), 17.901(5) β103.654(3)°, respectively. (OH) is...
Neptunium-237 is a radionuclide of great interest owing to its long half-life (2.14 × 10(6) years) and relative mobility as the neptunyl ion (NpO2(+)) under many surface groundwater conditions. Reduction tetravalent neptunium (Np(IV)) effectively immobilizes actinide in instances due low solubility strong interactions with natural minerals. One such mineral that may facilitate reduction magnetite (Fe(2+)Fe(3+)2O4). Natural magnetites often contain titanium impurities which have been shown...
The cation selectivity of several uranyl structural units is examined in the context five new compounds produced using ionothermal synthesis technique.
Abstract Two uranyl sulfate hydrates, (H 3 O) 2 [(UO ) (SO 4 O)] · 7H O (NDUS) and 4H (NDUS1), one selenate‐selenite [C 5 H 6 N][(UO )(SeO )(HSeO )] (NDUSe), were obtained their crystal structures solved. NDUS NDUSe result from reactions in highly acidic media the presence of L ‐cystine at 373 K. crystallized a closed vial 278 K after days an open beaker weeks. NDUS1 was synthesized aqueous solution room temperature over course month. NDUS, NDUS1, crystallize monoclinic space group P 1 / n ,...
Handheld laser induced breakdown spectroscopy (HH LIBS) was explored for its feasibility to perform rapid, semi-quantitative analysis of beryllium (Be) on fibrous swipe materials which could prove be impactful industrial hygiene (IH) based applications.
Improving control over radiolysis would advance nuclear technologies, spanning from radiotherapeutics to national security. Herein, we studied the effects of on large-scale production Am-241.
Preparation of relatively pure low concentration Pu(V) solutions for environmental studies is nontrivial due to the complex redox chemistry Pu. Ozone gas generated by an inexpensive unit designed household-use was used oxidize a 2 × 10(-8) M Pu(IV) solution predominantly Pu(VI) with some present. Over several days, in reduced without further reducing Pu(IV). The reduction from could be accelerated raising pH solution, which led immediate conversion substantial aqueous Pu found stable as...