A5054941976- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ion-surface interactions and analysis
- Iron oxide chemistry and applications
- Advanced ceramic materials synthesis
- Fusion materials and technologies
- Solid-state spectroscopy and crystallography
- High-pressure geophysics and materials
- Perovskite Materials and Applications
- Minerals Flotation and Separation Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Advancements in Battery Materials
- Ferroelectric and Piezoelectric Materials
- Advanced Battery Materials and Technologies
- Nuclear Materials and Properties
- Nuclear materials and radiation effects
- Graphite, nuclear technology, radiation studies
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Crystal Structures and Properties
- Machine Learning in Materials Science
- Integrated Circuits and Semiconductor Failure Analysis
- Semiconductor materials and interfaces
- Surface and Thin Film Phenomena
- Inorganic Fluorides and Related Compounds
Brookhaven National Laboratory
2016-2025
National Synchrotron Light Source II
2011-2025
Stanford Synchrotron Radiation Lightsource
2020-2025
Upton Hospital
2018-2020
Pacific Northwest National Laboratory
2017
University of Chicago
2006-2010
Stony Brook University
2010
Lawrence Berkeley National Laboratory
2007-2009
University of California, Berkeley
1972-2007
University of Alaska Fairbanks
2007
The cryogenic separation of noble gases is energy-intensive and expensive, especially when low concentrations are involved. Metal-organic frameworks (MOFs) containing polarizing groups within their pore spaces predicted to be efficient Xe/Kr solid-state adsorbents, but no experimental insights into the nature Xe-network interaction available date. Here we report a new microporous MOF (designated SBMOF-2) that selective toward Xe over Kr under ambient conditions, with selectivity about 10...
Distinct atomic nonpolar/polar ordering is determined at long, intermediate, and short ranges using synchrotron x-ray diffraction, Raman scattering, pair distribution function data in K0.5Na0.5NbO3-doped BaTiO3-based relaxor ferroelectrics, viz., (1−x)Ba0.9Sr0.1TiO3−xKNN50. Two different polar phases with distinct symmetries are identified short/intermediate for x=0.10, where a monoclinic phase gradually transforms into rhombohedral intermediate ranges. In contrast, nonpolar average cubic...
Lithium sulfur batteries (LSBs) are promising next-generation rechargeable due to the high gravimetric energy, low cost, abundance, nontoxicity, and sustainability of sulfur. However, dissolution high-order polysulfide in electrolytes Coulombic efficiency Li anode require excess metal, which significantly reduce energy density LSBs. Quasi-solid-state LSBs, where is encapsulated micropores carbon matrix sealed by solid electrolyte interphase, can operate under lean conditions, but a loading...
Flexible metal-organic frameworks (MOFs) hold great promise as smart materials for specific applications such gas separation. These undergo interesting structural changes in response to guest molecules, which is often associated with unique adsorption behavior not possible rigid MOFs. Understanding the dynamic of flexible MOFs crucial yet challenging it involves weak host-guest interactions and subtle transformation only at atomic/molecular level but also a nonsteady state. We report here an...
During synthesis, Zn<sup>2+</sup> ions become coordinated by 2-methylimidazole to form secondary building units which function as blocks the final ZIF-8 framework.
Aqueous Zn/MnO 2 batteries with their environmental sustainability and competitive cost, are becoming a promising, safe alternative for grid-scale electrochemical energy storage.
Sulfurized polyacrylonitrile (SPAN) has attracted a lot of attention because its low cost, high capacity, and great reversibility. Due to structural complexity amorphous nature, reaction mechanism SPAN is little understood. Here we study the interphasial changes using synchrotron-based pair distribution function (PDF) analysis soft X-ray absorption spectroscopy (sXAS). PDF identifies key features, including C–S bond, sulfur dimer, chain in SPAN. The dimer bridging pyridine network partially...
Li metal batteries using as negative electrode and LiNi
Abstract In‐situ flash experiments on rutile TiO 2 were performed at the synchrotron Brookhaven National Laboratory. Pair distribution function analysis of total X‐ray scattering measurements yielded mean‐square atomic displacements oxygen and titanium atoms during progression 3 stages flash. The are measured to be far greater for than atoms. These large may signal an “elastic softening” lattice, which, recently, has been predicted as a precursor onset
A library of thio- and selenourea derivatives is used to adjust the kinetics PbE (E = S, Se) nanocrystal formation across a 1000-fold range (
A multi-stage Mn dissolution–conversion charge storage mechanism in aqueous Zn/α-MnO 2 batteries was revealed via operando synchrotron X-ray absorption spectroscopy (XAS) and diffraction (XRD) as well ex situ Raman spectroscopy.
Abstract We show that flash experiments with three phase mixed‐powders of yttria‐stabilized zirconia (8YSZ), MgO, and α‐Al 2 O 3 not only produce polycrystals high density, but also the transformation magnesia alumina into single‐phase spinel. The presence facilitates onset flash. sintering in laboratory were extended to live at National Synchrotron Light Source II Brookhaven Laboratory order measure time‐dependent evolution occurred <3 seconds during Stage . Later, III cubic transformed...
Enhancement of adsorption capacity and separation radioactive Xe/Kr at room temperature above is a challenging problem. Here, we report detailed structural refinement analysis the synchrotron X-ray powder diffraction data Ni-DODBC metal organic framework with in situ Xe Kr above. Our results reveal that adsorb open sites, geometries well reproduced by DFT calculations. The measured temperature-dependent substantially larger than for Kr, indicating selectivity over consistent more negative...
Abstract An innovative organodisulfide compound, 2,3,4,6,8,9,10,12‐Octathia biscyclopenta[b,c]‐5,11‐anthraquinone‐1,7‐dithione (TPQD), has been successfully designed, synthesized, and characterized as a cathode material for lithium batteries. A benzoquinone is introduced to coordinate with dithiolane through 1,4‐dithianes. The molecular structure, electrochemical performances, the lithiation/delithiation mechanism of TPQD have systematically investigated. can deliver an initial capacity...
Developing novel and more efficient filters for chemical warfare agent (CWA) decomposition remains an important challenge modern technology due to the continuous threat those weapons present in event of use. Recently, metal–organic frameworks (MOFs) have attracted attention as potential catalysts nerve decomposition. However, order improve their performance under battlefield conditions, it is crucial understand influence ambient contaminants such carbon dioxide on CWA adsorption Here, we a...
A microstructural characterization of synthetic periodic multilayers by x-ray standing waves is presented. It shown that the analysis combined reflectometry (XRR) and standing-wave (XSW) techniques can overcome deficiencies individual in analysis. While interface roughnesses are more accurately determined XRR technique, layer composition XSW where an element directly identified its characteristic emission. These aspects explained with example a 20-period Pt/C multilayer. The C layers due to...