A5091152936- Nuclear Materials and Properties
- Molten salt chemistry and electrochemical processes
- High-Temperature Coating Behaviors
- Catalytic Processes in Materials Science
- Metallurgical Processes and Thermodynamics
- Fusion materials and technologies
- Drilling and Well Engineering
- Nuclear materials and radiation effects
- High Temperature Alloys and Creep
- Aerogels and thermal insulation
- High Entropy Alloys Studies
- Advanced X-ray Imaging Techniques
- CO2 Sequestration and Geologic Interactions
- Tunneling and Rock Mechanics
- ZnO doping and properties
- Concrete and Cement Materials Research
- Corrosion Behavior and Inhibition
- Nuclear reactor physics and engineering
- Hydrogen embrittlement and corrosion behaviors in metals
- Advanced materials and composites
- Hydrocarbon exploration and reservoir analysis
- Advanced Battery Materials and Technologies
- Ionic liquids properties and applications
- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
Brookhaven National Laboratory
2015-2024
Ames National Laboratory
2021-2023
Upton Hospital
2021
Baker Hughes (United States)
2014
Texas Tech University
2006-2011
The development of technologies for nuclear reactors based on molten salts has seen a big resurgence. success thermodynamic models these hinges in part our ability to predict at the atomistic level behavior pure and their mixtures under range conditions. In this letter, we present high-energy X-ray scattering experiments molecular dynamics simulations that describe structure MgCl2 KCl. As one would expect, KCl is prototypical salt which governed by simple charge alternation. contrast, its...
To examine ion solvation, exchange, and speciation for minority components in molten salts (MS) typically found as corrosion products, we propose a multimodal approach combining extended X-ray absorption fine structure (EXAFS) spectroscopy, optical ab initio molecular dynamics (AIMD) simulations, rate theory of exchange. Going beyond conventional EXAFS analysis, our method can accurately quantify populations different coordination states ions with highly disordered environments via linear...
Abstract Grain growth is prevalent in nanocrystalline (NC) materials at low homologous temperatures. Solute element addition used to offset excess energy that drives coarsening grain boundaries (GBs), albeit mostly for simple binary alloys. This thermodynamic approach considered complicated multi‐component alloy systems due complex pairwise interactions among alloying elements. Guided by empirical and GB‐segregation enthalpy considerations binary‐alloy systems, a novel design strategy, the “...
Helium implantation from transmutation reactions is a major cause of embrittlement and dimensional instability structural components in nuclear energy systems. Development novel materials with improved radiation resistance, which the utmost importance for progress energy, requires guidelines to arrive at favorable parameters more efficiently. Here, we present methodology that can be used design tolerant materials. We synchrotron X-ray reflectivity nondestructively study effects buried...
Understanding the factors that control solubility and speciation of metal ions in molten salts is key for their successful use salt reactors electrorefining. Here, we employ X-ray optical absorption spectroscopies molecular dynamics simulations to investigate coordination environment Ni(II) ZnCl2, where it poorly soluble, contrast with highly soluble Co(II) over a wide temperature range. In solid NiCl2, Ni ion octahedrally coordinated, whereas ZnCl2 host matrix favors tetrahedral...
Molten salts are of great interest as alternative solvents, electrolytes, and heat transfer fluids in many emerging technologies.
Knowledge of structural and thermal properties molten salts is crucial for understanding predicting their stability in many applications such as energy storage nuclear systems. Probing the behavior metal contaminants presently limited to either foreign ionic species or nanocrystals added melt. To bridge gap between these two end states follow nucleation growth salt environment situ, we use synchrotron X-rays both a source solvated electrons reducing Ni2+ ions ZnCl2 melt an atomic-level probe...
Monolithic mesoporous aerogels comprising cadmium sulfide nanoparticles partially coated with metallic silver (CdS-Ag) are synthesized, and it is determined that the concentration of has a significant impact on resultant CdS-Ag aerogel morphology porosity.
Enhancing the solar energy storage and power delivery afforded by emerging molten salt-based technologies requires a fundamental understanding of complex interplay between structure dynamics ions in high-temperature media. Here we report results from comprehensive study integrating synchrotron X-ray scattering experiments, ab initio molecular simulations rate theory concepts to investigate behavior dilute Cr3+ metal KCl-MgCl2 salt. Our analysis experimental assisted hybrid transition...
Lightweight high-entropy alloys (LHEAs) have the potential to replace conventional lightweight materials due their superior mechanical properties and thermal stability. However, degradation pattern of LHEAs from phase decomposition evaporation is not clear. We develop a new Al-based dual (FCC + HCP) LHEA—AlTi0.45CuZn, further investigate its behavior for high-temperature structural applications. Using multimodal advanced characterization techniques such as differential scanning...
Abstract The synthesis and characterization of porous nanostructured cobalt oxide (Co 3 O 4 ) aerogels using epoxide addition method is described. Cobalt‐containing monoliths were obtained by sol–gel processing an alcoholic chloride solution with propylene as the gelation agent. alcogels dried supercritical CO 2 fluid extraction to obtain highly amorphous (II) aerogels. To enhance control structural properties aerogels, single‐walled carbon nanotubes (SWCNT) incorporated into aerogel network...
Monolithic yttrium-based aerogels and xerogels were prepared by the epoxide addition method. The effects of changing both gelation solvent yttrium salt precursor in reaction investigated. porous morphology resulting aerogel materials was investigated using gas adsorption/desorption analysis, scanning electron microscopy transmission microscopy. which formed found to significantly impact structure physical these materials. counterion used synthesize gels also had a profound on gel formation....