Researchers at Duke University and Michigan State University used neutrons at Oak Ridge National Laboratory to gain new fundamental insights into two magnesium-based materials. Investigations at the atomic scale revealed the origin and mechanism behind the materials’ ability to convert thermal energy at room temperature into electricity and provides possible new pathways for improving thermoelectric applications such as those in the Perseverance rover and myriad other devices and energy-generation technologies.
States of local broken symmetry at high temperature—observed in several materials, including one with a metal-insulator transition, an iron-based superconductor, and an insulating mineral part of the Earth’s upper mantle—may enable the technologically relevant properties arising at much-lower temperature.
Researchers from Georgia Tech and the University of Tennessee–Knoxville uncovered hidden and unexpected quantum behavior in a simple iron-iodide material (FeI2) discovered almost a century ago. The new insights were enabled using neutron scattering experiments and theoretical physics calculations at the Department of Energy’s Oak Ridge National Laboratory. The team’s findings solves a 40-year-old puzzle about the material’s mysterious behavior and could be used as a map to unlock a treasure trove of quantum phenomena in other materials.
The enzyme manganese superoxide dismutase helps maintain human health by keeping the amount of reactive oxygen molecules in cells under control. Using neutron scattering at ORNL, researchers obtained a complete atomic portrait of the enzyme, revealing key information about its catalytic mechanism.
Scientists mapped the electronic states in an exotic superconductor. The maps point to the composition range necessary for topological superconductivity, a state that could enable more robust quantum computing.
Researchers design superalloys by embedding particles in a metal matrix. The particles and matrix can deform differently under stress, causing components to fail. Researchers used neutrons to probe the internal stresses in two superalloys at high temperatures and loads to obtain new insights on deformation and validate mathematical models. This will lead to components with longer life and higher reliability.
Physicists at Oak Ridge National Laboratory have developed a measurement technique to better understand beam loss—stray particles that travel outside the confinement fields of a particle accelerator. Mitigating beam loss is paramount to realizing more powerful accelerators at smaller scales and lower costs.
Using neutron experiments and computer simulations, researchers from Oak Ridge National Laboratory delved into how some of the proposed COVID-19 drug candidates behave at the molecular scale when exposed to water.
To investigate what happens inside cells when they are at risk of becoming cancerous, scientists at St. Jude Children’s Research Hospital have been using neutron scattering at Oak Ridge National Laboratory. The team is searching to better understand the altered state of the nucleolus—a membrane-less organelle inside the cell—when the cell is compromised. Novel insights into cell behavior at the atomic and molecular scales will enable better detection and treatment of cancer in its many forms.
Novel hot-carrier solar cells convert sunlight to electricity more efficiently than conventional solar cells by harnessing charge carriers before they lose their energy to heat. A key to keeping electric charges hot longer is to slow the phonons that transport heat. Recent research shows that thermal transport—and thus performance—in hot-carrier solar cells can be reduced by replacing hydrogen atoms with heavier deuterium atoms.
Researchers from Virginia Tech and Oak Ridge National Laboratory (ORNL) are using neutron scattering at ORNL’s Spallation Neutron Source to investigate how cell membranes and the COVID-19 virus impact each other and what therapeutic candidates could make cell membranes more resistant to viral entry.
Researchers at the Department of Energy’s Oak Ridge National Laboratory investigated the binding properties of several hepatitis C drugs to determine how well they inhibit the SARS-CoV-2 main protease, a crucial protein enzyme that enables the novel coronavirus to reproduce. Inhibiting, or blocking, the protease from functioning is vital to stopping the virus from spreading in patients with COVID-19.
Led by the Department of Energy’s Oak Ridge National Laboratory and the University of Tennessee, Knoxville, a study of a solar-energy material with a bright future revealed a way to slow phonons, the waves that transport heat.
Researchers at ORNL are using neutron scattering at the Spallation Neutron Source to better understand how spike proteins help the COVID-19 virus infect human cells and what drugs could be effective in stopping them.
Researchers from West Virginia University are using neutron scattering at Oak Ridge National Laboratory to study novel materials called high entropy oxides, or HEOs. Their goal is to collect insights into how the atoms in the HEOs bind together and whether the materials can be used to develop useful applications to improve power plant operations.
Researchers have performed the first room temperature X-ray measurements on the SARS-CoV-2 main protease—the enzyme that enables the virus to reproduce. It marks an important first step in the ultimate goal of building a comprehensive 3D model of the enzymatic protein that will be used to advance supercomputing simulations aimed at finding drug inhibitors to block the virus’s replication mechanism and help end the COVID-19 pandemic.
What began as novel investigations into HIV, abruptly pivoted to the novel coronavirus as it began to spread across the globe. Now, ORNL researchers are using neutrons to learn more about the SARS-CoV-2 protease—a protein enzyme that enables the virus to replicate within the human body. Insights on the protein structure and its behaviors will be used to create more accurate models for simulations in aims of finding drug inhibitors to block the virus’s ability to reproduce.
Researchers and engineers at the Spallation Neutron Source are making progress on the construction of VENUS, the facility’s newest neutron scattering instrument for studying materials in exciting new ways that are currently not possible for open research programs in the US.
Neutron scattering instruments at ORNL’s HFIR and SNS are undergoing upgrades which will enable them to study magnetic phenomena previously not possible in the US. Incorporating a device for spherical neutron polarimetry enables the ability to characterize complex magnetic systems in new dimensions for materials that could be developed for enhanced data storage and quantum computing technologies.
Neutron spectroscopy is an important tool for studying magnetic and thermoelectric properties in materials. But often the resolution, or the ability of the instrument to see fine details, is too coarse to clearly observe features identifying novel phenomena in new advanced materials. To solve this problem, researchers at Oak Ridge National Laboratory, developed a new super-resolution software, called SRINS, that makes it easier for scientists to better understand materials’ dynamical properties using neutron spectroscopy.
Scientists from Xavier University and Oak Ridge National Laboratory used neutrons to explore the atomic structure of ice, which sometimes features mysterious molecular anomalies in its otherwise crystalline structure. Learning more about these ionic defects could help researchers learn more about similar inconsistencies found in other materials.
Researchers led by the University of Manchester used neutron scattering at Oak Ridge National Laboratory in the development of a catalyst that converts biomass into liquid fuel with remarkably high efficiency and provides new possibilities for manufacturing renewable energy-related materials.
Colorado State researchers used neutron scattering at ORNL to study an ytterbium silicate material that exhibits a Bose-Einstein condensate, an unusual quantum phase of matter that may help better understand similar phenomena in other quantum materials.
A team led by the University of Manchester has developed a metal-organic framework material providing a selective, reversible and repeatable capability to capture a toxic air pollutant, nitrogen dioxide, which is produced by combusting fossil fuels. The material then requires only water and air to convert the captured gas into nitric acid for industrial use.
Researchers from Aarhus University, Denmark, are pioneering a novel technique to solve highly elaborate magnetic structures using neutrons at the Spallation Neutron Source. Their aim is to develop the technique to establish a baseline approach that can be adapted to a broad class of magnetic materials with different structures.
Corning researchers are using neutrons at ORNL’s Spallation Neutron Source to better understand the correlations between the structure and properties of glass to develop new compositions tailored for a range of applications.