ORNL Highlights

1-10 of 229 Results

World's Thinnest Proton Channel
— Graphene is a single-atom thin 2-dimensional array of carbon atoms that represents a barrier that is impenetrable even to protons unless graphene membrane has macroscopic holes.

Dynamic coupling drives conformational evolution of branched polymers in solutions
— The critical overlap concentration of polymer solutions, denoted c*, is one of the most important characteristic values of a polymer solution. This geometrically defined parameter is used to identify concentration regimes with different conformational characteristics.

Electronic Excitations Transform Structure of Ceramics
Ab initio molecular dynamics calculations reveal that electronic excitations induce a structural instability that transforms Y2Ti2O7, Gd2Ti2O7 and Sm2Ti2O7 with the pyrochlore crystal structure to an amorphous state.

New Atomic Force Microscope Spectroscopy Probes Local Elasticity
— Contact resonance imaging and voltage spectroscopy based on photothermal excitation were developed to explore local bias-induced phenomena. These techniques can access nanoscale elastic properties in real time during polarization switching in ferroelectric nonvolatile memories, and during ion intercalation in batteries and supercapacitors.

Review Finds Ionization Can Heal or Harm Materials
— An invited review on latest advances in ion beam modification of materials provides conclusive evidence that energy loss by energetic ions to electrons (ionization) can lead to either self-healing of radiation damage created by atomic collisions or contribute to radiation damage.

Iodine-coordinated sulfide leads to an exceptionally stable ceramic electrolyte
— Coordination of iodine atoms within the Li3PS4 (LPS) electrolyte results in a new ceramic electrolyte with the formulation Li7P2S8I, a coordinated material between LPS and LiI. This new formulation takes advantage of the chemical stability of LiI to render an electrolyte with excellent compatability with Li anode.

Thin magnetic crystals are path to ferromagnetic graphene
— Chromium triiodide (CrI3) crystals were identified as a promising platform for studying how magnetism can enhance electronic behaviors in materials that are only a few atoms thick. Development of such ultra-thin magnetic materials may be crucial for continued advancement in miniaturization and performance enhancement of electronic devices.

Researchers map atomic movements that trigger voltage fade in high-energy-density batteries
— ORNL researchers performed powder neutron diffraction experiments on high-voltage, high-capacity lithium- and manganese-rich nickel−manganese−cobalt layered composite oxides (LMR-NMCs) to obtain insights into the degradation mechanisms causing voltage fade in this high-potential cathode material.

Scientists Connect Thermoelectric Materials and Topological Insulators
— Quantum mechanical calculations of electronic structure and transport for Bi2Te3 and its sister material Bi2Te2Se solved the long-standing puzzle of why many materials that are topological insulators are also excellent thermoelectrics.

Rig designed to study effect of vibration on spent nuclear fuel
— Researchers have developed an innovative system, called Cyclic Integrated Reversible-bending Fatigue Tester (CIRFT), to test and evaluate the mechanical behavior of spent nuclear fuel (SNF) under normal transportation conditions. The SNF fatigue data generated by CIRFT technology are essential in assisting back end fuel cycle reliability investigation.

 
ASK ORNL

We're always happy to get feedback from our users. Please use the Comments form to send us your comments, questions, and observations.