Integrated Imaging Facility

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  • Author(s):
    S. Kharatyan, H. Chatilyan, K. Manukyan
    Abstract:

    Nickel oxide reduction by methane is of particular importance in catalysis, extractive metallurgy, and clean power generation technologies. Despite extensive investigations of the NiO + CH4 reaction, many questions remain about its kinetics and molecular and structural transformation mechanisms. This work reports the reduction kinetics of bulk polycrystalline NiO by CH4 using a new calorimetric method. The method permits rapid, controllable heating of the NiO/Ni wires and continuous data (ele…

    Date Published:
    2019-08
  • Author(s):
    Tuphan Devkota, Gregory Hartland
    Abstract:

    Propagating surface plasmon polaritons (PSPPs) are electron motions at the surfaces of conductors that have a definite momentum. For metal nanostructures on a glass substrate, two types of PSPP modes exist: bound modes where the field is localized at the metal−glass interface and leaky modes at the metal−air interface. In this paper, the leaky PSPP modes of Ag and Au nanostripes created by photolithography were examined by a combination of real space and Fourier space (back focal plane) imagi…

    Date Published:
    2019-06
  • Author(s):
    Svetlana Neretina
    Abstract:

    Substrate-supported plasmonic nanostructures are distinct from their colloidal counterparts, in that they are surrounded by an asymmetric dielectric environment composed of the substrate material and the surrounding ambient. Such environments inevitably lead to plasmonic resonances and near-fields that differ from those of solution-dispersed structures. The most straightforward method for fabricating substrate-based plasmonic nanostructures is through the solid-state dewetting of ultrathin fi…

    Date Published:
    2019-07
  • Author(s):
    Svetlana Neretina
    Abstract:

    Substrate-supported plasmonic nanostructures are distinct from their colloidal counterparts, in that they are surrounded by an asymmetric dielectric environment composed of the substrate material and the surrounding ambient. Such environments inevitably lead to plasmonic resonances and near-fields that differ from those of solution-dispersed structures. The most straightforward method for fabricating substrate-based plasmonic nanostructures is through the solid-state dewetting of ultrathin fi…

    Date Published:
    2019-07
  • Author(s):
    L. Merrill, H. Ford, L. Schaefer
    Abstract:

    The development of polymer electrolytes for magnesium batteries has been hindered by difficulties related to achieving sufficient magnesium ion conduction and magnesium electrodeposition. The high charge density of the magnesium cation causes it to interact with both the polar polymer matrix and any counteranions, challenging ion transport. Solvents and salts that are known to be incompatible with the magnesium electrode have widely been used in prior reports to increase ionic conductivity. H…

    Date Published:
    2019-08
  • Author(s):
    Bumjun Park, Hunter Ford, Laura Merrill, Jiacheng Liu, Loyal P. Murphy
    Abstract:

    Solid-state magnesium-ion conductors are desired for next-generation battery applications. Here we investigate magnesium conducting polymer electrolytes produced through dual cation exchange of a poly(ionic liquid) by mixing 1-butyl-3- methylimidazolium poly4-styrenesulfonyl(trifluoro- methanesulfonyl)imide with the magnesiated analogue Mg(PSTFSI)2. An ionic conductivity of 8.6 × 10−5 S cm−1 at 80 °C was achieved for the poly(ionic liquid), and conductivity did not significantly…

  • Author(s):
    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:
    2019-08
  • 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):
    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):
    Alexander Mukasyan, Sergey Roslyakov, Joshua Pauls, Leighton Gallington, Tatuama Pr;pva, Xinyu Liu, Margaret Dobrowolska, Jacek Furdyna, Khachatur Manukyan
    Abstract:

    A single-step method for the preparation of metastable ε-Fe3N nanoparticles by combustion of reactive gels containing iron nitrate (Fe(NO3)3) and hexamethylene-tetramine (C6H12N4) in an inert atmosphere is reported. The results of Fourier transform infrared spectroscopy (FTIR) and thermal analysis coupled with dynamic mass spectrometry revealed that the exothermic decomposition of a coordination complex formed between Fe(NO3)3 and HMTA is responsible for the formation of ε-Fe3N nanoscale part…

    Date Published:
    2019-05
  • Author(s):
    Rebecca Scheidt, Corey Atwell, Prashant Kamat
    Abstract:

    The control of grain size and surface properties is an important parameter in controlling the optoelectronic and photovoltaic properties of metal halide perovskites. When CsPbBr 3 nanocrystal (∼10 nm in diameter) films were annealed at 100−125 °C, they grow in size to produce ∼400 nm diameter crystallites while transforming into bulk perovskite films. Characteristic changes in the optical properties were noted when such transformation occurred from nanocrystals into bulk. By tracking absorban…

    Date Published:
    2019-06
  • Author(s):
    P. J. McGinn
    Abstract:

    High-throughput combinatorial investigations are transforming materials discovery, phase diagram development, and processing optimization. Thin-film deposition techniques are frequently used to fabricate sample libraries employed in these studies. Various adaptations of well-known thin-film chemical vapor deposition (CVD) and physical vapor deposition (PVD) techniques utilized for the synthesis of inorganic combinatorial thin-film materials libraries are reviewed, with novel processing approa…

    Date Published:
    2019-06