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  • Author(s):
    Sachwa Chong, Sergei M. Aksenov, Frabrice Dal Bo, Samuel N. Perry, Foteini Dimakopoulou, Peter C. Burns
    Abstract:

    Uranyl vanadate compounds with divalent cations, M(UO2)(V2O7) (M = Ca, Sr) and Sr3(UO2)(V2O7)2, were synthesized by flux crystal growth, and their crystal structures were solved using single-crystal X-ray diffraction data. Ca(UO2)V2O7 and Sr(UO2)V2O7 were synthesized from reactants with molar ratios M:U:V of 1:1:2 and identical heating conditions, and increasing the M:U:V ratio to 3:1:4 resulted in Sr3(UO2)(V2O7)2. Crystallographic data for M(UO2)V2O7 compounds are: a = 7.1774(18) Å, b = 6.77…

    Date Published:
    2019-07
  • Author(s):
    Karen Torosyan, Alexey Sedegov, Kirill Kuskov, Mohammad Abedi, Dmitry Arkhipov, Philipp Kiryukhamtsev-Korneer, Stepan Vorotilo, Dmitry Moskovskikh
    Abstract:

    The influence of different SPS-based methods, that is, conventional spark plasma sintering (SPS), flash SPS (FSPS), and reactive SPS (RSPS) on the properties of Al2O3/SiC composite was investigated. It was shown that the application of preliminary high energy ball milling of the powders significantly enhances the sinterability of the ceramics. It was also demonstrated that FSPS provides unique conditions for rapid, that is, less than a minute, consolidation of refractory ceramics. The Al2O3-2…

    Date Published:
    2019-07
  • Author(s):
    J. Schiltz, Andrew Rosenberger, Todd Render, Bernice Aboud Gatrell, Haibo Qu, Colton Steiner, Paul McGinn, Steve Schmid
    Abstract:

    Ceramics have exceptional tribological performance in high wear applications, but susceptibility to brittle fracture requires expensive postprocessing, including hot isostatic pressing and polishing. Consequently, additive manufacturing (AM) represents a collection of potentially costsaving approaches for ceramic production. AM technologies have been demonstrated for oxide ceramics, but the performance of self-mated AM materials remains unknown and underscores a critical knowledge gap. Alumin…

    Date Published:
    2019-06
  • Author(s):
    Christopher Smyth, Lee Walsh, Pavel Bolshakov, Massimo Catalano, Michael Schmidt, Brendan Sheehan, Rafik Addou, Luhua Wang, Jiyoung Kim, Moon Kim, Christopher Hinkle, Robert Wallace
    Abstract:

    Sc has been employed as an electron contact to a number of two-dimensional (2D) materials (e.g. MoS2, black phosphorous) and has enabled, at times, the lowest electron contact resistance. However, the extremely reactive nature of Sc leads to stringent processing requirements and metastable device performance with no true understanding of how to achieve consistent, high-performance Sc contacts. In this work, WSe2 transistors with impressive subthreshold slope (109 mV dec−1) and I ON/I OFF (106…

    Date Published:
    2019-07
  • Author(s):
    Christopher Smyth, Lee Walsh, Pavel Bolshakov, Massimo Catalano, Michael Schmidt, Brendan Sheehan, Rafik Addou, Luhua Wang, Jiyoung Kim, Moon Kim, Christopher Hinkle, Robert Wallace
    Abstract:

    Sc has been employed as an electron contact to a number of two-dimensional (2D) materials (e.g. MoS2, black phosphorous) and has enabled, at times, the lowest electron contact resistance. However, the extremely reactive nature of Sc leads to stringent processing requirements and metastable device performance with no true understanding of how to achieve consistent, high-performance Sc contacts. In this work, WSe2 transistors with impressive subthreshold slope (109 mV dec−1) and I ON/I OFF (106…

    Date Published:
    2019-07
  • Author(s):
    Shanmugam Panneer Selvam, Ryan De Palma, Kristen Johnson, Rasesh Parikh, Vamsi Gangaraju, Yuri Peterson, Mohammed Dany, Robert V. Stahelin, Christina Voelkel-Johnson, Zdzislaw Szuic, Erhard Bieberich, Besi Ogetmen
    Abstract:

    Formation of membrane pores/channels regulates various cellular processes, such as necroptosis or stem cell niche signaling. However, the roles of membrane lipids in the formation of pores and their biological functions are largely unknown. Here, using the cellular stress model evoked by the sphingolipid analog drug FTY720, we show that formation of ceramide-enriched membrane pores, referred to here as ceramidosomes, is initiated by a receptor-interacting Ser/Thr kinase 1 (RIPK1)-ceramide com…

    Date Published:
    2019-01
  • 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):
    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):
    L. C. Gallington, J. M. Pauls, T. Orlova, O. M. Miloserdova, N. V. Chapysheva, A. S. Rogachev, A. S. Mukasyan
    Abstract:

    Mechanochemical synthesis of hafnium nitride ceramic powder was accomplished through direct nitridation of hafnium particles in nitrogen atmosphere during high-energy milling in a planetary ball mill. The nitrogen content was measured and evaluated to determine the reaction kinetics for hafnium – nitrogen across a range of treatment durations. The observed reaction rates are notably faster than for conventional thermal treatment, and, for hafnium treated for 5 min in the ball mill, the onset …

    Date Published:
    2019-08
  • Author(s):
    Prashant Kamat
    Abstract:

    Cesium lead halide perovskite films with a systematic change in the halide composition of CsPbBr3−xIx, in which iodide concentration varies from x = 0 to x = 3, provide a built-in gradient band structure. Such a gradient structure allows for the integrated capture of visible photons and directs them to the energetically low-lying iodide rich region. Annealing gradient halide perovskite films at temperatures ranging from 50 ○C to 90 ○C causes the films to homogenize into mixed halide perovskit…

    Date Published:
    2019-10
  • 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