A5018037542- Fusion materials and technologies
- Nuclear Materials and Properties
- Ion-surface interactions and analysis
- Nuclear materials and radiation effects
- Semiconductor materials and devices
- X-ray Spectroscopy and Fluorescence Analysis
- Molten salt chemistry and electrochemical processes
- Advanced materials and composites
- Nonlinear Optical Materials Studies
- Nuclear reactor physics and engineering
- High Temperature Alloys and Creep
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and interfaces
- Graphite, nuclear technology, radiation studies
- Advanced ceramic materials synthesis
- Additive Manufacturing Materials and Processes
- Nuclear Physics and Applications
- Quantum Dots Synthesis And Properties
- High Entropy Alloys Studies
- Silicon Nanostructures and Photoluminescence
- Integrated Circuits and Semiconductor Failure Analysis
- Diamond and Carbon-based Materials Research
- Additive Manufacturing and 3D Printing Technologies
- X-ray Diffraction in Crystallography
- Microstructure and Mechanical Properties of Steels
State University of New York
2019-2025
Stony Brook University
2019-2025
Massachusetts Institute of Technology
2022-2024
Brookhaven National Laboratory
2014-2022
Oak Ridge National Laboratory
2021
Stony Brook Medicine
2020
Australian National University
2008-2017
Australian Synchrotron
2015-2017
KU Leuven
2015-2016
RMIT University
2015-2016
Abstract Aging in super glassy polymers such as poly(trimethylsilylpropyne) (PTMSP), poly(4‐methyl‐2‐pentyne) (PMP), and with intrinsic microporosity (PIM‐1) reduces gas permeabilities limits their application gas‐separation membranes. While are initially very porous, ultra‐permeable, they quickly pack into a denser phase becoming less porous permeable. This age‐old problem has been solved by adding an ultraporous additive that maintains the low density, initial stage of through absorbing...
We report on the observation of a fine structure in ion tracks amorphous SiO2 using small angle x-ray scattering measurements. Tracks were generated by high energy irradiation with Au and Xe between 27 MeV 1.43 GeV. In agreement molecular dynamics simulations, consist core characterized significant density deficit compared to unirradiated material, surrounded shell. The is consistent frozen-in pressure wave originating from center track as result thermal spike.
The hierarchical nature of additively manufactured materials necessitates a multimodal approach for quantifying microstructural features and corresponding chemical heterogeneities that ultimately impact their properties performance. In laser powder-bed fusion (L-PBF) 316L stainless steel, corrosion behavior has been discussed in the context formed presence these microstructures. Here, we employ suite advanced synchrotron x-ray techniques correlative transmission electron microscopy analysis...
Swift heavy-ion irradiation of elemental metal nanoparticles (NPs) embedded in amorphous ${\mathrm{SiO}}_{2}$ induces a spherical to rodlike shape transformation with the direction NP elongation aligned that incident ion. Large, once-spherical NPs become progressively more while small below critical diameter do not elongate but dissolve matrix. We examine this for ten metals under common condition achieve mechanistic insight into process. Subtle differences are apparent including saturation...
Additive manufacturing (AM) rapidly produces complex shapes crucial for energy technologies and engineering designs. In this work, the microstructure mechanical properties of additive manufactured Grade 91 (modified 9Cr–1Mo) ferritic/martensitic (FM) steel were investigated. Computational thermodynamics, synchrotron X-ray diffraction, scanning electron microscopy, microhardness testing utilized to quantify (crystallographic phases, microstrain), lattice parameters, as functions build...
Crystal violet (CV) is an organic chloride salt and a triphenylmethane dye commonly used in the textile processing industry, also being as disinfectant biomedical stain. Although CV widely used, it carcinogenic to humans retained by industrial-produced effluent for extended period. The different types of metal oxide (MOx) have impressive photocatalytic properties, allowing them be utilized pollutant degradation. role photocatalyst facilitate oxidation reduction processes trapping light...
The use of molten salts as coolants, fuels, and tritium breeding blankets in the next generation fission fusion nuclear reactors benefits from furthering characterization molecular structure halide salts, paving way to predictive capability chemical thermophysical properties salts. Due its neutronic, chemical, thermochemical properties, 2<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mrow><a:mi>Li</a:mi><a:mi...
The chemical interactions in Fe–HfH2 metal matrix composites (MMCs) are studied across multiple length scales to elucidate the decomposition of parent phases and corresponding reaction zone physics during direct current sintering. were synthesized with increasing as-mixed hydride contents Fe–25% HfH2, Fe–40% Fe–55% Fe–70% HfH2 (all vol. %) demonstrate ability achieve sintered MMCs target contents. Samples probed through a multi-modal workflow employing x-ray diffraction, scanning electron...
Pt nanoparticles (NPs) formed by ion-beam synthesis in amorphous ${\text{SiO}}_{2}$ were irradiated with Au ions the energy range of 27--185 MeV. Small-angle x-ray scattering (SAXS) and transmission electron microscopy used to characterize an irradiation-induced shape transformation within NPs. A simple yet effective way analyzing SAXS data determine both NP dimensions is presented. from spherical rodlike increasing irradiation fluence was observed for NPs larger than energy-dependent...
Ferritic-martensitic steels such as T91 and T92 are currently considered candidate materials for structural applications in next generation nuclear power systems, including sodium-cooled fast reactors, owing to their low neutron cross-section attractive mechanical properties at elevated temperatures. However, accelerated degradation of microstructural is expected occur during exposure high temperatures extended times, necessitating additional data predict long-term service behavior. As part...
Molten fluoride salts such as Li 2 BeF 4 (FLiBe) are used in molten salt reactors, fluoride-salt-cooled high-temperature reactors and fusion a fuel solvent, coolant and/or tritium breeding medium. In engineered systems that use salt, solid-state material will be present during melting freezing scenarios, therefore the temperature-dependent properties of solid solid/liquid phase transition merit investigation. To observe behavior state from room temperature to melting, this work neutron X-ray...
Abstract Aging in super glassy polymers such as poly(trimethylsilylpropyne) (PTMSP), poly(4‐methyl‐2‐pentyne) (PMP), and with intrinsic microporosity (PIM‐1) reduces gas permeabilities limits their application gas‐separation membranes. While are initially very porous, ultra‐permeable, they quickly pack into a denser phase becoming less porous permeable. This age‐old problem has been solved by adding an ultraporous additive that maintains the low density, initial stage of through absorbing...
Pyrochlore (A2B2O7) is an important, isometric structure-type because of its large variety compositions and structural derivatives that are generally related to different disordering mechanisms at various spatial scales. The key understanding variations in properties, such as magnetic behavior or ionic conduction. Neutron X-ray total scattering methods were used investigate the degree disorder Ho2Ti2-x Zr x O7 (x = 0.0-2.0, Δx 0.25) solid solution series a function Zr-content, x. Ordered...
Neutron moderators, such as nuclear-grade graphite, are essential components of high-temperature nuclear reactors. Their primary functions to degrade the energy fission-born neutrons into an range that promotes further fission and serve central core structure. This paper will discuss historic reactor moderator materials, which relatively simple monolithic materials each having intrinsic benefits limitations. Additionally, a new class engineered composite moderators is presented for two...
A combination of conventional and synchrotron-based techniques has been used to characterize the size-dependent structural thermal properties Ge nanocrystals (NCs) embedded in a silica $(a{\text{-SiO}}_{2})$ matrix. NC size distributions with four different diameters ranging from 4.0 9.0 nm were produced by ion implantation annealing as characterized small-angle x-ray scattering transmission electron microscopy. The NCs well represented superposition bulklike crystalline amorphous...