A5074093480- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Magnetic and transport properties of perovskites and related materials
- Nuclear materials and radiation effects
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Thermal Expansion and Ionic Conductivity
- Crystallization and Solubility Studies
- Radioactive element chemistry and processing
- Soil Carbon and Nitrogen Dynamics
- ZnO doping and properties
- Nuclear Materials and Properties
- X-ray Diffraction in Crystallography
- Transition Metal Oxide Nanomaterials
- Statistical Distribution Estimation and Applications
- Catalytic Processes in Materials Science
- Microwave Dielectric Ceramics Synthesis
- CO2 Sequestration and Geologic Interactions
- Financial Risk and Volatility Modeling
- Advanced ceramic materials synthesis
- Concrete and Cement Materials Research
Pacific Northwest National Laboratory
2015-2024
University of Veterinary Medicine
2012-2024
Environmental Molecular Sciences Laboratory
2015-2024
University of Pecs
2017-2023
Battelle
2013-2022
University of Washington
2022
Semmelweis University
1971-2021
University of Szeged
2006-2021
University of Minnesota
2020
Richland College
2014-2019
Alternative methods, including green synthetic approaches for the preparation of various types nanoparticles are important to maintain sustainable development. Extracellular or intracellular extracts fungi perfect candidates synthesis metal due scalability and cost efficiency fungal growth even on industrial scale. There several methods techniques that use fungi-originated fractions gold nanoparticles. However, there is less knowledge about drawbacks limitations these techniques....
Agricultural soils are a major reservoir of microplastics, and concerns have arisen about the impacts microplastics on soil properties functioning. Here, we measured physical silt loam in response to incorporation polyester fibers polypropylene granules over wide range concentrations. We further elucidated underlying mechanisms by determining role microplastic shape baseline effects from amendment particles. The into tended increase contact angle saturated hydraulic conductivity decrease...
Copper thiocyanate (CuSCN) is a candidate as transparent solid p-type conductor for optoelectronic and photovoltaic applications, such solar cells. We calculate the band structure, bonding characteristics, basic native defect configurations of hexagonal β-CuSCN. β-CuSCN predicted to be an indirect-gap semiconductor with unusual orbital character: although highest valence bands have expected character Cu 3d levels hybridized S 3p states, conduction minimum (at K point Brillouin zone) has...
Metal–organic frameworks (MOFs) have shown promising behavior for adsorption cooling applications. Using organic ligands with 1, 2, and 3 phenylene rings, we construct moisture-stable Ni-MOF-74 members adjustable pore apertures, which exhibit excellent sorption capabilities toward water fluorocarbon R134a. To our knowledge, this is the first report of isotherms R134a in MOFs. The patterns these materials differ significantly are attributed to variances their hydrophobic/hydrophilic character...
We report the magnetic and electrical characteristics of polycrystalline FeTiO_{3} synthesized at high pressure that is isostructural with acentric LiNbO_{3} (LBO). Piezoresponse force microscopy, optical second harmonic generation, magnetometry demonstrate ferroelectricity below room temperature weak ferromagnetism approximately 120 K. These results validate symmetry-based criteria first-principles calculations coexistence in a series transition metal titanates crystallizing LBO structure.
Abstract Commercial Cu/SAPO-34 selective catalytic reduction (SCR) catalysts have experienced unexpected and quite perplexing failure. Understanding the causes at an atomic level is vital for synthesis of more robust catalysts. Here we show, via application model with homogeneously dispersed isolated Cu ions, that transformations resulting from low-temperature hydrothermal aging ambient temperature storage can be semi-quantitatively probed 2-dimensional pulsed electron paramagnetic...
Radiation tolerance is determined by how effectively the microstructure can remove point defects produced irradiation. Engineered nanocrystalline SiC with a high-density of stacking faults (SFs) has significantly enhanced recombination interstitials and vacancies, leading to self-healing irradiation-induced defects. While single crystal readily undergoes an crystalline amorphous transformation at room temperature, nano-engineered SFs exhibits more than order magnitude increase in radiation...
${\mathrm{LaAlO}}_{3}$ epitaxial films with La:Al cation ratios ranging from 0.9 to 1.2 were grown on ${\mathrm{TiO}}_{2}$-terminated ${\mathrm{SrTiO}}_{3}$ (001) substrates by off-axis pulsed laser deposition. Although all are epitaxial, rocking curve measurements show that the crystallographic quality degrades increasing ratio. Films of 0.9, 1.0, and 1.1 coherently strained substrate. However, out-of-plane lattice parameter increases over this range, revealing a decrease in film...
Abstract Climate change is intensifying the global water cycle, with increased frequency of drought and flood. Water an important driver soil carbon dynamics, it crucial to understand how moisture disturbances will affect availability fluxes in soils. Here we investigate role substrate-microbe connectivity cycling under extreme conditions. We collected soils from Alaska, Florida, Washington USA, incubated them Drought Flood had a stronger effect on respiration, pore-water carbon, microbial...
Phosphorus is one of the essential nutrients for plant growth, but it may be relatively unavailable to plants because its chemistry. In soil, majority phosphorus present in form a phosphate, usually as metal complexes making bound minerals or organic matter. Therefore, inorganic phosphate solubilization an important process growth promotion by associated bacteria and fungi. Non-nodulating species have been shown thrive low-nutrient environments, some instances relying on microorganisms...
Climate change in Arctic landscapes may increase freeze–thaw frequency within the active layer as well newly thawed permafrost. Freeze-thaw is a highly disruptive process that can deform soil pores and alter architecture of pore network with varied impacts to water transport retention, redox conditions, microbial activity. Our objective was investigate how cycles impacted permafrost aggregates improve understanding what type transformations be expected from warming landscapes. We measured...
Carbon can be used to create unusual nanostructures of Si–C–O by controlled pyrolysis silsesquioxane organics. Unlike silica, these ceramics resist crystallization at ultrahigh temperatures. Their structure has been compared with that polymers, where crosslinked chains polymers in organics are replaced networks graphene the ceramics. The network sequesters nanoscale domains SiO 4 tetrahedra. resistance nanodomain attributed kinetic factors, namely obstruction long‐range diffusion silica. In...
The perovskite ${\text{NaOsO}}_{3}$ shows a Curie-Weiss metallic nature at high temperature and suddenly goes into an antiferromagnetically insulating state 410 K on cooling. Electronic specific heat the low-temperature limit is absent, indicating that band gap fully opens. In situ observation in electron microscopy undetected any lattice anomalies vicinity of transition temperature. It most likely antiferromagnetic correlation plays essential role opening.
A Au-CeO2 nanocomposite film has been investigated as a potential sensing element for high-temperature plasmonic of H2, CO, and NO2 in an oxygen containing environment. The CeO2 thin was deposited by molecular beam epitaxy (MBE), Au implanted into the as-grown at elevated temperature followed high annealing to form well-defined nanoclusters. characterized X-ray diffraction (XRD) Rutherford backscattering spectrometry (RBS). For gas experiments, separate exposures varying concentrations were...
We report on a cobalt/manganese-oxide interface catalyst with outstanding activity and selectivity towards methane even at high temperatures ambient pressure in CO2 hydrogenation. The was formed from MnCo2O4-based spinel structure during the oxidative-reductive pretreatment process just before catalytic tests. Several Mn-, Fe- Ni-containing cobaltite reverse structures were tested to find best overall performer. reusable featured consumption rate of ~8500 nmol*g−1*s−1. Even though is not...
Rare earth nickelates including LaNiO3 are promising catalysts for water electrolysis to produce oxygen gas. Recent studies report that Fe substitution Ni can significantly enhance the evolution reaction (OER) activity of LaNiO3. However, role in increasing remains ambiguous, with potential origins both structural and electronic nature. On basis a series epitaxial LaNi1–xFexO3 thin films synthesized by molecular beam epitaxy, we tunes oxidation state volcano-like OER trend is observed, x =...
A key question to address in the development of oxygen isotope ratios phosphate (δ(18)O(p)) as a tracer biogeochemical cycling phosphorus ancient and modern environments is nature isotopic signatures associated with uptake mineral-bound by microorganisms. Here, we present experimental results aimed at understanding biotic abiotic pathways P during biological sorbed ferrihydrite selective sedimentary phases Escherichia coli Marinobacter aquaeolei. Results indicate that significant fraction...