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  • Author(s):
    Patrick Barboun, Prateek Mehta, Francisco Herrera, David Go, William Schneider, Jason Hicks
    Abstract:

    Plasma-assisted catalysis is the process of electrically activating gases in the plasma-phase at low temperatures and ambient pressure to drive reactions on catalyst surfaces. Plasma-assisted catalytic processes combine conventional heterogeneous surface reactions, homogeneous plasma phase reactions, and coupling between plasma-generated species and the catalyst surface. Herein, we perform kinetically controlled ammonia synthesis measurements in a dielectric barrier discharge (DBD) plasma-ass…

    Date Published:
    2019-07
  • Author(s):
    Junsang Cho, Jeffrey T. DuBose, Prashant Kamat
    Abstract:

    Lead-free double perovskites such as Cs2AgBiBr6 are gaining attention because of their environmental friendliness compared to the lead halide perovskites. In order to establish their photoactivity, we have probed the excited-state behavior of Cs2AgBiBr6 nanocrystals and charge injection from their excited state into different metal oxides (TiO2, ZnO). The electron-transfer rate constants determined from ultrafast transient absorption spectroscopy were in the range of 1.2−5.2 × 1010 s−1. Under…

    Date Published:
    2019-12
  • Author(s):
    Sarah Peterson, Kyle Bibby
    Abstract:

    Fecal indicator bacteria currently employed for microbial water quality management are poor representatives of viruses. Viral water quality indicators have recently been proposed based on the human gut bacteriophage crAssphage and the food virus pepper mild mottle virus (PMMoV) due to their high abundance in sewage and association to human waste. Here, we develop a model relating crAssphage and PMMoV abundance to risk of swimmer illness in a recreational water contaminated with fresh, untreat…

    Date Published:
    2019-08
  • Author(s):
    Robert Hughes, Sergei Rouvimov, Robert Neal, Trevor B. Demille, Svetlana Neretina
    Abstract:

    The seed-mediated growth of noble metal nanostructures with planar geometries requires the use of seeds lined with parallel stacking faults so as to provide a break in symmetry in an otherwise isotropic metal. Although such seeds are now routinely synthesized using colloidal pathways, equivalent pathways have not yet been reported for the fabrication of substrate-based seeds with the same internal defect structures. The challenge is not merely to form seeds with planar defects but to do so in…

    Date Published:
    2019-07
  • Author(s):
    Seung-Ryong Kwon, Paul Bohn
    Abstract:

    The attoliter volumes and confinement abilities of zero- dimensional nanopore-electrode arrays (NEAs) hold considerable promise for examining the behavior of single nanoparticles. In this work, we use surface- enhanced Raman scattering (SERS) in tandem with amperometry in order to monitor single Ag Raman-sentinel nanoparticles transported to and captured in single nanopores. To that end, highly ordered solid-state NEAs were fabricated to contain periodic arrays of nanopores, each housing a si…

    Date Published:
    2019-03
  • 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