A5043945141- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Advancements in Solid Oxide Fuel Cells
- Fuel Cells and Related Materials
- Advanced Chemical Sensor Technologies
- Nuclear materials and radiation effects
- Electrocatalysts for Energy Conversion
- Air Quality Monitoring and Forecasting
- Ammonia Synthesis and Nitrogen Reduction
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Catalytic Processes in Materials Science
- Sensor Technology and Measurement Systems
- Advanced biosensing and bioanalysis techniques
- Electrochemical Analysis and Applications
- Vehicle emissions and performance
- Semiconductor materials and devices
- Advanced Battery Materials and Technologies
- Magnetic and transport properties of perovskites and related materials
- Radioactive element chemistry and processing
- Solid-state spectroscopy and crystallography
- Spectroscopy and Laser Applications
- DNA and Nucleic Acid Chemistry
- Caching and Content Delivery
- Microwave Dielectric Ceramics Synthesis
Los Alamos National Laboratory
2015-2024
Los Alamos Medical Center
2018-2020
Sensors (United States)
2013-2016
University of Washington
2007-2014
Johns Hopkins University
2005-2010
IBM Research - Almaden
2002-2004
Abstract Spinels represent an important class of technologically relevant materials, used in diverse applications ranging from dielectrics, sensors and energy materials. While solid solutions combining two “single spinels” have been explored a number past studies, no ordered “double” spinels reported. Based on our first principles computations, here we predict the existence such double spinel compound MgAlGaO 4 , formed by equimolar mixing MgAl 2 O normal MgGa inverse spinels. After studying...
Porous (LSC) electrodes having Sr composition (LSC-64) and (LSC-82) were fabricated on Sm-doped ceria electrolytes, studied using electrochemical impedance spectroscopy between . The faradaic portion of the was found to exhibit Gerischer or Gerischer-like characteristics, indicating colimitation by kinetics transport. characteristic resistance frequency response analyzed a transport reaction model that considers parallel bulk surface diffusion oxygen, as well three-dimensional effects near...
High performance of SnP<sub>2</sub>O<sub>7</sub>-based intermediate temperature fuel cells was obtained with a quaternary ammonium-biphosphate ion-pair coordinated polymer electrolyte.
Efforts to create a sustainable hydrogen economy are gaining momentum as governments all over the world investing in production, storage, distribution, and delivery technologies develop infrastructure. This involves transporting gaseous or liquid form using carrier gases such methane, ammonia, mixtures of methane hydrogen. Hydrogen is colorless, odorless gas can easily leak into atmosphere leading economic loss safety concerns. Therefore, deployment robust low-cost sensors for various...
The conductivity of Gd<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> with irradiation-induced structural disorder increased as the material transformed from ordered pyrochlore to defect-fluorite.
Multilayer nanoporous films generated by a layer-by-layer spin-on method are presented (see Figure). Precise control of the porosity individual layers that comprise multilayer structure is demonstrated. Due to simplicity this fabrication wide range potential applications in areas separation science, biotechnology, optics etc. envisaged.
The C4′-oxidized abasic site (C4-AP), which is produced by a variety of damaging agents, has significant consequences for DNA. lesion highly mutagenic and reactive, resulting in interstrand cross-links. base excision repair DNA containing independently generated C4-AP was examined. incised Ape1 ∼12-fold less efficiently than an apurinic/apyrimidinic lesion. polymerase β induces the β-elimination ternary complexes, duplexes, single-stranded substrate. However, from complex most rapid. In...
A mixed potential sensor using Au and Pt dense wire electrodes embedded between tape-casted layers of 8 mol% yttria stabilized zirconia (YSZ) was tested for application toward NH3, NO, NO2, C3H6 C3H8. In single-gas testing, the exhibited highest response while still exhibiting reasonably high sensitivity other interferent gases. The in a high-flow reactor at National Transportation Research Center (NTRC) order to simulate exhaust gas constituents flow rates produced by lean-burn vehicles...
We report a direct photopatterning method to produce patterns of thin films containing nanometer-sized pores. A photoacid generator (PAG) was used as photosensitive agent initiate the cross-linking reaction poly(methylsilsesquioxane) (PMSSQ) while an amphiphilic polymeric nanoparticle templates porous structure. Deep UV exposure on PMSSQ/nanoparticle mixtures through photolithographic mask and subsequent solvent rinsing give well-defined hybrid where nanoparticles are entrapped in...
Films of La0.8Sr0.2CoO3-δ (LSC-82) with 45 and 90 nm thickness were grown epitaxially on (001) oriented single crystal yttria-stabilized zirconia a thin gadolinium-doped ceria interlayer using pulsed laser deposition, characterized X-ray diffraction (XRD), depth-profile secondary mass spectrometry (DP-SIMS), linear nonlinear electrochemical impedance spectroscopy (EIS NLEIS). The films found to exhibit in-plane tensile strain normal compressive (with overall increased lattice volume)...
Ammonia production has increased from few thousand tons in 1908 to above 200 million per year today, revolutionizing the fertilizer industry thanks Haber-Bosch (HB) process. However, HB process is highly energy intensive consuming about 1.4% of fossil generated worldwide and releasing 1.87 CO 2 ton ammonia produced. This further reduces ammonia’s scope as a carrier fuel for hydrogen economy. Hence, finding alternative efficient ways synthesize important more than one perspective. synthesis...
Mass transport is one of the most fundamental properties a material and dictates its potential use for range applications. In simple materials, mass determined by migration point defects along well defined pathways. When considering complex oxides, however, new considerations arise that complicate both our understanding ability to describe transport. Chemical disorder, mixing cations across different sublattices, these considerations. This disorder leads energy landscape impacts...
Materials that exhibit fast ionic conduction in the intermediate temperature range are highly sought after for applications fuel cells, electrolyzers, and sensors. Initial reports on tin pyrophosphate indicted this material exhibited excellent protonic conductivity at 100–300 °C transport occurred via proton hopping through bulk crystalline lattice. In work, we conclusively show high reported by other research groups is not attributable to phase. The mechanism of well-characterized...
Proper phosphorus precursor selection during synthesis could help produce better tin-pyrophosphate powder and composite membranes with improved fuel cell performance.
We report a simple and effective method to generate hydrophilicity-contrasted patterns on porous thin films containing nanometer sized pores. The were prepared by removal of the organic polymer phase, denoted as porogen, from nanohybrid poly (methylsilsesquioxane) (PMSSQ) porogen where nanoscopic domains are phase separated entrapped in cross-linked PMSSQ matrix. Selective masking UV radiation during UV/ozone treatment produces contrasted hydrophilicity. Hydrophilic with resolution ∼4 μm...
The C4'-oxidized abasic site (C4-AP) is produced by a variety of DNA damaging agents. This alkali labile lesion can exist in up to four diastereomeric cyclic forms, addition the acyclic keto-aldehyde. Synthetic oligonucleotides containing were prepared from stable photochemical precursor. Chemical integrity was probed using phosphodiesterase lability. Analysis 3',5'-phosphate diester monomeric released single diastereomers photolabile precursors 1H NMR indicates that isomerization hemiacetal...