A5041136947- Radioactive element chemistry and processing
- Chemical Synthesis and Characterization
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Lanthanide and Transition Metal Complexes
- Nuclear Materials and Properties
- Phase Equilibria and Thermodynamics
- Extraction and Separation Processes
- Molecular Sensors and Ion Detection
- Radiopharmaceutical Chemistry and Applications
- Luminescence and Fluorescent Materials
- Material Dynamics and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- Analytical Chemistry and Sensors
- Spectroscopy and Quantum Chemical Studies
- Geochemistry and Geologic Mapping
- Covalent Organic Framework Applications
- Advanced Thermodynamics and Statistical Mechanics
- Radioactive contamination and transfer
- Surfactants and Colloidal Systems
Argonne National Laboratory
2018-2021
Alex's Lemonade Stand Foundation
2021
University of Chicago
2015-2020
XAFS investigation of polyamidoxime-bound uranyl reveals an adjacent μ<sup>2</sup>-oxo-bridged transition metal, suggesting new routes for adsorbent design in radionuclide separations.
The amidoxime group (-RNH2NOH) has long been used to extract uranium from seawater on account of its high affinity toward uranium. development tunable sorbent materials for sequestration remains a research priority as well significant challenge. Herein, we report the design, synthesis, and sorption properties bis-amidoxime-functionalized polymeric (BAP 1-3). Bifunctional monomers were copolymerized with an acrylamide cross-linker obtain bis-amidoxime incorporation 2 mmol g-1 after five...
Informed by density functional theory calculations, a novel bifunctional chelator, (Z)-2-[2-(N′-hydroxycarbamimidoyl)phenoxy]benzoic acid, was designed and synthesized for ultrahigh uranium uptake from seawater. Investigation of the ligand sorption conducted in artificial seawater (pH = 8.2). An exceptional 553 mg (g sorbent)−1 obtained with theoretical saturation capacity 710 g–1 fitting isotherm data Langmuir–Freundlich model. The resulting yellow precipitate characterized via X-ray...
The role of different intermolecular interactions in the aggregation amphiphiles an organic solvent is studied for systems relevance to liquid-liquid extraction (LLE), a chemical process used selectively recover metals from complex mixtures. Of specific interest role, or lack thereof, hydrogen bonding, which often assumed be main driver phase structural organization that has been linked separation efficacy. Toward end, series malonamide extractants n-dodecane have absence any extracted...
Solution structure in liquid–liquid extraction affects the efficacy of separation; however, even for simplified organic phases, structural characterization and attribution aggregation to intermolecular interactions are fundamental challenges. We investigate water uptake into phases two malonamides commonly applied actinide lanthanide separations. Extracted induces reorganization amphiphilic extractant molecules, although we find this rearrangement is not strongly manifested small-angle X-ray...
XAFS investigations of uranyl binding by an adsorbent polymer reveal different coordination modes than anticipated from previous small molecule studies.
There is significant interest in the rapid and efficient detection of amines, which are widely used different industries also serve as markers many biological processes. This work reports that coupling a thiosemicarbazide binding motif naphthalimide-based chromophore affords highly sensitive sensor molecules, can indicate presence amines with pronounced readily visible color change. It was demonstrated mechanism involves proton transfer from to analyte. process renders broadly exploitable....
Density functional theory and separation experiments combine to demonstrate the selectivity of bis-amidoxime polymer for uranyl extraction from aqueous solution.
Abstract P olymerized h igh i nternal p hase e mulsion s (poly(HIPE)s) are porous polymer monoliths whose synthesis can easily be tailored to allow incorporation of functional units. In this work, nitrile containing poly(HIPE)s have been prepared with either acrylonitrile (AN) or 4‐cyanostyrene (4CS) comonomers. Post‐synthetic modification these nitrile‐containing yields their corresponding amidoximated analogues, which were studied for actinide uptake. These amidoxime‐functionalized,...
The molecular and nanoscale origins of nonideality in excess thermodynamic properties are essential to understanding cosolvent mixtures, yet they remain challenging determine.