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  • Author(s):
    Gergely Samu, Adam Balog, Filippo De Angelis, Daniele Meggiolaro, Prashant Kamat, Csaba Janáky
    Abstract:

    Abstract Halide ion mobility in metal halide perovskites remains an intriguing phenomenon, influencing their optical and photovoltaic properties. Selective injection of holes through electrochemical anodic bias has allowed us to probe the effect of hole trapping at iodide (0.9 V) and bromide (1.15 V) in mixed halide perovskite (CH3NH3PbBr1.5I1.5) films. Upon trapping holes at the iodide site, the iodide gradually gets expelled from the mixed halide film (as iodine and/or triiodide ion), leavi…

    Date Published:
    2019-06
  • Author(s):
    Jinyang Li, Jeremy D. Kirch, Chris Signler, Luke Mawst, Emanuele Pelucci, Frank H. Peters, Douglas Hall
    Abstract:

    A deep-etched high-index-contrast ridge waveguide for low bend loss photonic integration is realized through selective lateral oxidation of a λ 1⁄4 1.55 mm AlInGaAs multi-quantum well diode laser heterostructure waveguide core layer sandwiched between InP cladding layers. The process is enabled by first depositing a thin protective layer to fully suppress the thermal dissociation of exposed InP surfaces during the subsequent oxygen-enhanced wet thermal oxidation process. Either %30–100 nm of …

    Date Published:
    2019-02
  • Author(s):
    Wenzheng Kuang, Chaochao Dun, Yanliang Zhang
    Abstract:

    Flexible thermoelectric (TE) devices hold great promise for energy harvesting and cooling applications, with increasing signi cance to serve as perpetual power sources for exible electronics and wearable devices. Despite unique and superior TE properties widely reported in nanocrystals, transforming these nanocrystals into exible and functional forms remains a major challenge. Herein, demonstrated is a transformative 3D conformal aerosol jet printing and rapid photonic sintering process to pr…

    Date Published:
    2019-01
  • Author(s):
    Hope Pearson, Devon Mason, Christopher Kegelman, Liming Zhao, James Dawahare, Melissa Kacena, Joel Boerckel
    Abstract:

    Insufficient blood vessel supply is a primary limiting factor for regenerative approaches to large bone defect repair. Recombinant BMP-2 delivery induces robust bone formation and has been observed to enhance neovascularization, but whether the angiogenic effects of BMP-2 are due to direct endothelial cell stimulation or to indirect paracrine signaling remains unclear. Here, we evaluated the effects of BMP-2 delivery on vascularized bone regeneration and tested whether BMP-2 induces neovascul…

    Date Published:
    2019-09
  • Author(s):
    Marshall McDonnell, Li Yang, Tiankai Yao, Jennifer E. S. Szymanoski, Joerg Neuefeind, Ginger Sigmon, Jie Lian, Matthew Tucker, Brian Wirth, Maik Lang, Raul Palomares
    Abstract:

    UO2.07 was characterized using neutron total scattering in order to elucidate defect morphology in the low oxygen-to-metal regime (x < 0.125 for UO2+x). Data were collected at temperatures (600 and 1000 °C) coinciding with the single-phase UO2+x region of the established phase diagram, and results were compared with data of stoichiometric UO2 collected at near-identical temperatures. Experimental data were modeled and interpreted using a holistic approach employing a combination of analyse…

    Date Published:
    2019-05
  • Author(s):
    Paolo Paletti, Ruoyu Yue, Christopher Hinkle, Susan Fullerton-Shirey, Alan Seabaugh
    Abstract:

    Two-dimensional van der Waals materials offer unique advantages for the development of band-to-band tunneling devices given their lack of dangling bonds, atomically flat thickness and steep band edges. Here, we present the experimental demonstration of an electric double layer (EDL) Esaki junction in synthetic WSe2 thin films. A Si-compatible process is developed for the fabrication of nanoscale FETs utilizing molecular beam epitaxy of WSe2 performed directly on top of a high-κ dielectric at ba…

    Date Published:
    2019-04
  • Author(s):
    Haylie L. Lobeck, Hrafn Traustason, Patrick Julien, John FitPatrick, Sara Mana, Jennifer Szymanowski, Peter Burns
    Abstract:

    The behaviours of two uranyl peroxide nanoclusters in water heated to 180 °C were examined by in situ Raman spectroscopy. Aqueous solutions containing the nanoscale uranyl peroxide cage clusters U 60 , [(UO 2 )(O 2 )(OH)] 60 60− , and U 60 Ox 30 , [{(UO 2 )(O 2 )} 60 (C 2 O 4 ) 30 ] 60− , were monitored by in situ Raman spectroscopy during stepwise heating to 180 °C. In solutions containing U 60 , clusters persist to 120 °C, although conversion of U 60 to U 24 , [(UO 2 )(O 2 )(OH)] 24 24− , o…

    Date Published:
    2019-04
  • 8

    Article

    Author(s):
    Haylie Lobeck, Jordan Isner, Peter Burns
    Abstract:

    The dissolution behavior of uranyl peroxide studtite, (UO2)(O2)(H2O)22, was examined under a wide range of alkaline aqueous environments with and without the addition of hydrogen peroxide. In the absence of added H2O2, studtite dissolved in aqueous solutions with a tetraethylammonium hydroxide to uranium molar ratio greater than 0.5, and the resulting species in solution characterized by Raman spectroscopy and electrospray ionization mass spectrometry (ESI-MS) is the uranyl peroxide na…

    Date Published:
    2019-06
  • Author(s):
    Peter M. Kogge
    Abstract:

    The last decade has seen the growth of data sets that are not only extremely large, but also often unstructured and very dynamic, with the desire to extract not just specific facts about specific entities but also relationships between possibly arbitrary entities. Graphs have emerged as a valuable and productive paradigm for expressing such problems, and there has been an explosion in new graph algorithms, graph query languages, and graph engines that perform such computations. However, given…

    Date Created:
    2019-09-10
    Resource Type
    Report
  • Author(s):
    Laura C. Merrill, Jennifer Schaefer
    Abstract:

    One of the limiting factors in the development of magnesium batteries is the reversibility of magnesium electrodeposition and dissolution at the anode. Often irreversibility is related to impurities and decomposition. Herein we report on the cycling behavior of magnesium metal anodes in different electrolytes, Mg(HMDS)2 – 4 MgCl2 in tetrahydrofuran (THF) and a butyl sulfone/THF mixture. The deposition morphology and anode-electrolyte interface is studied and related to Mg/Mg cell cycling perf…

    Date Published:
    2019-04
  • Author(s):
    Fabrice Dal Bo, Sergei Akesenov, Peter Burns
    Abstract:

    A novel hydrated magnesium uranyl germanate, Mg[(UO 2 ) 2 (Ge 2 O 6 (OH) 2 )]·(H 2 O) 4.4 , has been synthesized under hydrothermal conditions at 200 °C. The orthorhombic unit-cell parameters are a =10.829(6), b =7.625(4), c =16.888(10) Å, V =1394.5(1) Å 3 , space group Cmcm , Z =4. The crystal structure is based on β-U 3 O 8 -type sheets of corner- and edge-sharing U 6+ O 7 pentagonal bipyramids. The GeO 3 (OH) tetrahedra and GeO 4 (OH) trigonal bipyramids are linked to form [Ge 2 φ 8 ] dior…

    Date Published:
    2019-02
  • Author(s):
    Peng He, Hunter Ford, Laura Merrill, Jennifer Schaefer
    Abstract:

    Abstract: Rechargeable magnesium sulfur (Mg/S) batteries suffer from fast capacity fading due to difficulty of reoxidation of MgS and the polysulfide shuttle. Other works have reported that use of Cu current collectors or CuS at the cathode improves cycleability. Here we investigate Cu nanoparticles grown on carbon nanofibers (Cu@CNF) as an additive for the Mg/S battery cathode to test the effects of Cu metal on capacity and rate performance at controlled Cu loading. The Mg/S battery with Cu …

    Date Published:
    2019-06