A5001109383- Catalytic Processes in Materials Science
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Ammonia Synthesis and Nitrogen Reduction
- Physics of Superconductivity and Magnetism
- Gas Sensing Nanomaterials and Sensors
- Catalysis and Oxidation Reactions
- Multiferroics and related materials
- Advanced Photocatalysis Techniques
- Nonlinear Waves and Solitons
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Electrophoretic Deposition in Materials Science
- Mesoporous Materials and Catalysis
- Quantum many-body systems
- Iron-based superconductors research
- 2D Materials and Applications
- Electrokinetic Soil Remediation Techniques
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Innovations in Concrete and Construction Materials
- Wastewater Treatment and Nitrogen Removal
- Concrete and Cement Materials Research
- Machine Learning in Materials Science
- Microbial Fuel Cells and Bioremediation
Brookhaven National Laboratory
2020-2025
University of Puerto Rico at Río Piedras
2012-2017
University of Puerto Rico System
2015
Type-II multiferroicity from non-collinear spin order is recently explored in the van der Waals material NiI2. Despite importance for improper ferroelectricity, microscopic mechanism of helimagnetic remains poorly understood. Here, magneto-structural phases NiI2 are investigated using resonant magnetic X-ray scattering (RXS) and diffraction. Two competing identified. Below 60 K, an incommensurate reflection (q ≈ [0.143,0,1.49] reciprocal lattice units) observed which exhibits finite circular...
Abstract The unconventional normal-state properties of the cuprates are often discussed in terms emergent electronic order that onsets below a putative critical doping x c ≈ 0.19. Charge density wave (CDW) correlations represent one such order; however, experimental evidence for generally spans limited range falls short value , leading to questions regarding its essential relevance. Here, we use X-ray diffraction demonstrate CDW La 2− Sr CuO 4 persist up at least = 0.21. show strong changes...
The Fe intercalated transition metal dichalcogenide (TMD), ${\mathrm{Fe}}_{1/3}{\mathrm{NbS}}_{2}$, exhibits remarkable resistance switching properties and highly tunable spin ordering phases due to magnetic defects. We conduct synchrotron x-ray scattering measurements on both underintercalated ($x=0.32$) overintercalated ($x=0.35$) samples. discover a new charge order phase in the sample, where excess atoms lead zigzag antiferromagnetic order. agreement between temperatures, as well their...
A high-throughput, operando-ready X-ray absorption spectroscopy catalytic reaction cell consisting of 4 parallel reactors was designed to collect near edge structure and extended fine spectra under conditions. The is capable operating at temperatures from ambient conditions up 773 K pressures 2 MPa in a variety gas environments. design mechanically simple, programmable operation beamline 8-ID (NSLS-II, Brookhaven National Laboratory) makes it straightforward use. Reactor tube parts were...
This is a study of the chronoamperometric performance electrochemical oxidation ammonia in an alkaline fuel cell for space applications. Under microgravity diminished by absence buoyancy since nitrogen gas produced. The following catalysts were studied: platinum nanocubes ca. 10nm, on carbon Vulcan and nanoonion support 10nm. These nanomaterials studied order to search that may reduce or counter loss current densities under conditions. Chronoamperometries at potential values ranging from 0.2...
Spinons are well known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is subject intense research. Here, we use resonant x-ray scattering study layered trimer iridate Ba_{4}Ir_{3}O_{10}, which shows no magnetic order down 0.2 K. An emergent spinon continuum observed that can be described by XXZ spin-1/2 chains with a exchange ∼55 meV and small Ising-like anisotropy. With 2% isovalent Sr doping, appears below...
Platinum deposited on boron doped diamond is a robust material for use as an electrode. In this work platinum by method developed in the laboratory, Rotating Disc Slurry Electrode (RoDSE). The synthesized catalyst was characterized Raman spectroscopy, xray diffraction, transmission electron microscopy, cyclic voltammetry and chronoamperometry half cell. used anode side of membrane electrode assembly (MEA) direct alkaline fuel cell where power density curves were obtained hydrogen ammonia...
Microgravity effect on the electrochemical oxidation of ammonia at platinum nanoparticles modified mesoporous carbon (MPC) substrates, with three different pore diameters, e.g. 64, 100, and 137 Å, have been studied in a parabolic flight between 24,000 32,000 ft. effects chronoamperometric current density was function support used. This may be described as graphitic multilayer hollow globules, even though globules do not present specific shape seen HRTEM images. Platinum were successfully...
Abstract not Available.
The Fe intercalated transition metal dichalcogenide (TMD), Fe$_{1/3}$NbS$_2$, exhibits remarkable resistance switching properties and highly tunable spin ordering phases due to magnetic defects. We conduct synchrotron X-ray scattering measurements on both under-intercalated ($x$ = 0.32) over-intercalated 0.35) samples. discover a new charge order phase in the sample, where excess atoms lead zigzag antiferromagnetic order. agreement between temperatures, as well their intensity relationship,...