A5075770763- Metal-Organic Frameworks: Synthesis and Applications
- Magnetic Properties and Applications
- Metal and Thin Film Mechanics
- Metallic Glasses and Amorphous Alloys
- Magnetic properties of thin films
- Induction Heating and Inverter Technology
- Nanoplatforms for cancer theranostics
- Nanocluster Synthesis and Applications
- Aluminum Alloys Composites Properties
- Semiconductor materials and devices
- High Entropy Alloys Studies
- Advanced Nanomaterials in Catalysis
- Copper Interconnects and Reliability
- Magnetic Properties of Alloys
- X-ray Diffraction in Crystallography
- Advanced materials and composites
- Electrodeposition and Electroless Coatings
- Dendrimers and Hyperbranched Polymers
- Crystallization and Solubility Studies
- Silicon Carbide Semiconductor Technologies
- Radioactive element chemistry and processing
- Surface Roughness and Optical Measurements
- Ga2O3 and related materials
- Electromagnetic wave absorption materials
- Electrical and Thermal Properties of Materials
Sandia National Laboratories
2016-2025
Sandia National Laboratories California
2012-2020
Long-term antimicrobial therapies are necessary to treat infections caused by virulent intracellular pathogens, including biothreat agents. Current treatment plans include injectable therapeutics given multiple times daily over a period for up 8 weeks. Here, we present metal–organic framework (MOF), zeolitic imidazolate framework-8 (ZIF-8), as robust platform support the sustained release of ceftazidime, an important agent many critical bacterial infections. Detailed material...
Abstract Optical tags provide a way to quickly and unambiguously identify valuable assets. Current tag fluorophore options lack the tunability allow combined methods of encoding in single material. Herein we report design strategy encode multilayer complexity family heterometallic rare‐earth metal–organic frameworks based on highly connected nonanuclear clusters. To impart both intricacy security, synergistic approach was implemented resulting overt (visible) covert (near‐infrared, NIR)...
We report on the availability and chemical utility of primary amines within metal–organic frameworks (MOFs) for cell targeting. Primary amine groups represent one most versatile moieties conjugation to biologically relevant molecules, including antibodies enzymes. Specifically, we used two different conjugations schemes, utilizing amino functionality organic linker: first, carbodiimide chemistry was link available carboxyl protein neutravidin; second, sulfhydryl cross-linking via Traut's...
Transformer cores exhibiting higher operating power and improved efficiency are of great interest to electrical utilities, industry, the de-carbonization effort. Minnealloy, α″-Fe16(C,N)2, a martensite made only iron, nitrogen, carbon, has shown largest saturation magnetization any soft ferromagnet, 250 emu/g, tunable magnetocrystalline anisotropy. Given this represents significant increase in transferred per cycle compared legacy transformer core materials, we investigate three novel,...
Metal–organic frameworks are shown to degrade organophosphorus compounds in non-aqueous environments, highlighting appropriate simulants for the nerve agent sarin.
Biocompatible mixed metal YbNd metal–organic frameworks are demonstrated to be highly efficient emitters in the second NIR window.
Yttrium iron garnet (${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$; YIG) has a unique combination of low magnetic damping, high spin-wave conductivity, and insulating properties that make it highly attractive material for variety applications in the fields magnetics spintronics. While room-temperature magnetization dynamics YIG have been extensively studied, there are limited reports correlating low-temperature to structure or growth method. Here we investigate liquid phase epitaxy...
A rapid and facile design strategy to create a highly complex optical tag with programmable, multimodal photoluminescent properties is described. This was achieved via intrinsic DNA-fluorophore hidden signatures. As first covert feature of the tag, an intricate novel heterometallic near-infrared (NIR)-emitting mesoporous metal-organic framework (MOF) designed synthesized. The material constructed from two chemically distinct, homometallic hexanuclear clusters based on Nd Yb. Uniquely,...
Insights into the MOF-based degradation of organophosphorus compounds in non-/aqueous solvents highlights effect solvent size on reaction rates.
Niobium and niobium nitride thin films are transitioning from fundamental research toward wafer scale manufacturing with technology drivers that include superconducting circuits electronics, optical single photon detectors, logic, memory. Successful microfabrication requires precise control over the properties of sputtered films, including oxidation. Previous work has demonstrated mechanism in oxidation Nb how film structure could have deleterious effects upon properties. This study provides...
Abstract Commercial electrical steels, Fe-Si alloys with < 4 wt.% Si, are inexpensive and efficient materials for power conversion. Further efficiency improvements require increasing the silicon concentration to 6 wt.%, at which point material becomes brittle difficult form by conventional rolling sheet fabrication methods. Additive manufacturing stands overcome challenges commercial techniques leveraging near-net-shape fabrication. The wide array of process conditions provides additive...
Producing soft magnetic alloys by additive manufacturing has the potential to overcome cracking and brittle fracture issues associated with conventional thermomechanical processing. Fe–Co exhibit high saturation but low ductility that makes them difficult process commercial methods. Ni–Fe have good permeability in comparison Fe–Co, they suffer from saturation. Functional grading between through blown powder directed energy deposition can produce materials combine enhance properties beyond...
Abstract For transformers and inductors to meet the world’s growing demand for electrical power, more efficient soft magnetic materials with high saturation polarization resistivity are needed. This work aimed at development of a composite synthesized via spark plasma sintering both cores. CoFe powder particles coated an insulating layer Al 2 O 3 were used as feedstock material improve while retaining polarization. By maintaining continuous non-magnetic phase throughout material,...
Abstract Many challenges must be overcome in order to create reliable electrochemical energy storage devices with not only high but also power densities. Gaps exist both battery and supercapacitor technologies, neither one satisfying the need for large densities a single device. To begin addressing these (and others), we report process self-assembled array of electrochemically active nanoparticles bound directly current collector using extremely short (2 nm or less) conductive tethers. The...
Barium titanate (BTO) nanoparticles show great potential for use in electrostatic capacitors with high energy density. This includes both polymer composite and sintered capacitors. However, questions about the nanoparticles’ size distribution, amount of agglomeration, surface ligand effect on performance properties remain. Reducing particle agglomeration is a crucial step to understanding nanoscale particles, as has significant effects dielectric constant. BTO functionalization using...
Abstract Optical tags provide a way to quickly and unambiguously identify valuable assets. Current tag fluorophore options lack the tunability allow combined methods of encoding in single material. Herein we report design strategy encode multilayer complexity family heterometallic rare‐earth metal–organic frameworks based on highly connected nonanuclear clusters. To impart both intricacy security, synergistic approach was implemented resulting overt (visible) covert (near‐infrared, NIR)...
Novel multilayered FeSiCrB-Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> N (1 = 2-4) metallic glass composites were fabricated using spark plasma sintering of FeSiCrB amorphous ribbons (Metglas 2605SA3 alloy) and Fe powder. Crystalline can serve as a high magnetic moment, electrical resistance binder, lamination material in the consolidation nanocrystalline ribbons, mitigating eddy currents while boosting performance stacking factor...
Abstract In this study, dense bulk iron nitrides (Fe x N) were synthesized for the first time ever using spark plasma sintering (SPS) of Fe N powders. The 4 phase nitride in particular has significant potential to serve as a new soft magnetic material both transformer and inductor cores electrical machines. density SPSed increased with SPS temperature pressure. microstructure consolidated was characterized X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM),...
Topological insulator--magnetic insulator (TI--MI) heterostructures hold significant promise in the field of spintronics, offering potential for manipulating magnetization through topological surface state--enabled spin-orbit torque. However, many TI--MI interfaces are plagued by issues such as contamination within magnetic layer and presence a low-density transitional region insulator. These interfacial challenges often obscure intrinsic behavior system. In this study, we addressed these...