Publications

Publications

An Acrylonitrile–Butadiene–Lignin Renewable Skin with Programmable and Switchable Electrical Conductivity for Stress/Strain-Sensing Applications

Journal: ACS Publications Macromolecules

We report an approach for programming electrical conductivity of a bio-based leathery skin devised with a layer of 60 nm metallic nanoparticles. Lignin-based renewable shape-memory materials were made, for the first time, to program and restore the materials’ electrical conductivity after repeated deformation up to...

Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate

Journal: APS Physics

The insulating honeycomb magnet α−RuCl3 exhibits fractionalized excitations that signal its proximity to a Kitaev quantum spin liquid state; however, at T=0 , fragile long-range magnetic order arises from non-Kitaev terms in the Hamiltonian. Spin vacancies in the form of Ir3+ substituted for Ru are found to...

Supertough PLA-Silane Nanohybrids by in Situ Condensation and Grafting

Journal: ACS Publications

Xiangtao Meng (hi-res image) Brittleness is a key barrier for poly(lactic acid) (PLA) toward broader applications. Supertough PLA was achieved by simply mixing a low amount (0.5–1 wt %) of organoalkoxysilane with PLA. Three organosilanes, (3-aminopropyl)triethoxysilane (APTES), 3-(triethoxysilyl)...

A magnetic topological semimetal Sr1−yMn1−zSb2 (y, z < 0.1)

Journal: Nature Materials

Weyl (WSMs) evolve from Dirac semimetals in the presence of broken time-reversal symmetry (TRS) or space-inversion symmetry. The WSM phases in TaAs-class materials and photonic crystals are due to the loss of space-inversion symmetry. For TRS-breaking WSMs, despite numerous theoretical and experimental efforts, few...

Evolutionary selection growth of two-dimensional materials on polycrystalline substrates

Journal: Nature Materials

There is a demand for manufacturing 2D materials with the ultimate quality of single crystals and arbitrary size. Usually, epitaxial growth is considered the method of choice1 in prepar-ing single crystalline thin films but it in turn requires single crystal substrates for deposition. Here we present a different...

Temperature Measurement by a Nanoscale Electron Probe Using Energy Gain and Loss Spectroscopy

Journal: Physical Review Letters

Heat dissipation in integrated nanoscale devices is a major issue that requires the development of nanoscale temperature probes. Here, we report the implementation of a method that combines electron energy gain and loss spectroscopy to provide a direct measurement of the local temperature in the nanoenvironment. Loss...

Colossal photon bunching in quasiparticle-mediated nanodiamond cathodoluminescence

Journal: Physical Review B

Nanoscale control over the second-order photon correlation function g(2)(τ) is critical to emerging research in nonlinear nanophotonics and integrated quantum information science. Here we report on quasiparticle control of photon bunching with g(2)(0)>45 in the cathodoluminescence of nanodiamond nitrogen vacancy (...

Strain control of oxygen kinetics in the Ruddlesden-Popper oxide La1.85Sr0.15CuO4

Journal: Nature Communications

Oxygen defect control has long been considered an important route to functionalizing complex oxide films. However, the nature of oxygen defects in thin films is often not investigated beyond basic redox chemistry. One of the model examples for oxygen-defect studies is the layered Ruddlesden–Popper phase La2−xSr x CuO4...

Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites

Journal: Advanced Materials

A fundamental understanding of the interplay between the microscopic structure and macroscopic optoelectronic properties of organic‐inorganic hybrid perovskite materials is essential to design new materials and improve device performance. However, how exactly the organic cations affect the structural...

High burn-up spent nuclear fuel transport reliability investigation

Journal: Nuclear Engineering and Design

Transportation packages for spent nuclear fuel (SNF) must meet safety requirements under normal and accident conditions as specified by federal regulations. During road or rail transportation, SNF will experience unique conditions that could affect the structural integrity of the cladding due to vibrational and impact...

ORNL: Providing access to nuclear infrastructure, expertise

Journal: Nuclear News

The Department of Energy's Oak Ridge National Laboratory, in partnership with the Nuclear Science User Facilities (NSUF), provides researchers from universities, industry, and other national labs fully funded access to ORNL's dedicated nuclear infrastructure and expertise to study nuclear fuels and materials.  ORNL...

Supersonic propagation of lattice energy by phasons in fresnoite

Journal: Nature Communications

Controlling the thermal energy of lattice vibrations separately from electrons is vital to many applications including electronic devices and thermoelectric energy conversion. To remove heat without shorting electrical connections, heat must be carried in the lattice of electrical insulators. Phonons are limited to...

Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts

Journal: Wiley Online Library

Although perovskites have been widely used in catalysis, tuning of their surface termination to control reaction selectivity has not been well established. In this study, we employed multiple surface-sensitive techniques to characterize the surface termination (one aspect of surface reconstruction) of SrTiO3 (STO)...

PdSe2: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics

Journal: Journal of the American Chemical Society (JACS)

Most studied two-dimensional (2D) materials exhibit isotropic behavior due to high lattice symmetry; however, lower-symmetry 2D materials such as phosphorene and other elemental 2D materials exhibit very interesting anisotropic properties. In this work, we report the atomic structure, electronic properties, and...

High performance aluminum–cerium alloys for high-temperature applications

Journal: Royal Society of Chemistry

Light-weight high-temperature alloys are important to the transportation industry where weight, cost, and operating temperature are major factors in the design of energy efficient vehicles. Aluminum alloys fill this gap economically but lack high-temperature mechanical performance. Alloying aluminum with cerium...

Structural relaxation, viscosity, and network connectivity in a hydrogen bonding liquid

Journal: Physical Chemistry Chemical Physics

In liquids, the ability of neighboring molecules to rearrange and jostle past each other is directly related to viscosity, the property which describes the propensity to flow. The presence of hydrogen bonds (H-bonds) complicates the molecular scale picture of viscosity. H-Bonds are attractive, directional interactions...

Seeing real-space dynamics of liquid water through inelastic x-ray scattering

Journal: Science Advances

Water is ubiquitous on earth, but we know little about the real-space motion of molecules in liquid water. We demonstrate that high-resolution inelastic x-ray scattering measurement over a wide range of momentum and energy transfer makes it possible to probe real-space, real-time dynamics of water molecules through...

Dimensional stability and anisotrophy of SiC and SiC-based composites in transition swelling regime

Journal: Journal of Nuclear Materials

Swelling, or volumetric expansion, is an inevitable consequence of the atomic displacement damage in crystalline silicon carbide (SiC) caused by energetic neutron irradiation. Because of its steep temperature and dose dependence, understanding swelling is essential for designing SiC-based components for nuclear...

Dislocation loop formation in model FeCrAl alloys after neutron irradiation below 1 dpa

Journal: Journal of Nuclear Materials

FeCrAl alloys with varying compositions and microstructures are under consideration for accident-tolerant fuel cladding, but limited details exist on dislocation loop formation and growth for this class of alloys under neutron irradiation. Four model FeCrAl alloys with chromium contents ranging from 10.01 to 17.51 wt...

Probing Multiscale Transport and Inhomogeneity in a Lithium-Ion Pouch Cell Using In Situ Neutron Methods

Journal: ACS Energy Letters

We demonstrate the lithiation process in graphitic anodes using in situ neutron radiography and diffraction in a single-layer pouch cell. The variation in neutron absorption contrast in graphite shows a direct correlation between the degree of lithiation and the discharge potential. The experimental neutron...

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