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  • Author(s):
    Yang Hu, Renxi Jin, Justin Easa, Wei Lu, Man Yang, Xianchun Liu, Yan Xing, Zhang Shi
    Abstract:

    Double-shell hollow nanofiber supported copper catalysts with strong metal–support interactions were prepared and applied in the reverse water–gas shift reaction. Highly active and stable copper catalysts were successfully achieved by in situ self-reduction treatment of hierarchical double-shell copper silicate hollow nanofibers. The coexistence of Cu 0 and Cu + species in the as-prepared catalysts demonstrated the strong metal–support interactions and endowed them with outstanding catalytic …

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    E. I. Moiseev, F. I. Zubov, A. M. Mozharov, M. V. Maximov, N. A. Kalyuzhnyy, S. A. Mitairov, M. M. Kulagina, S. A. Blokhin, K. E. Kudyavtsev, A. N. Yablonskiy, S. V. Morozov, Y. Bernikov, S. Rouvimov, A. E. Khukov, N. V. Kryzhanovskaya
    Abstract:

    GaAs-based microdisk lasers with an active region representing a dense array of indium-rich islands (InGaAs quantum well-dots) were studied using direct small-signal modulation. We demonstrate that using dense arrays of InGaAs quantum well-dots enables uncooled high-frequency applications with a GHz-range bandwidth for microdisk lasers. A maximum 3 dB modulation frequency of 5.9 GHz was found in the microdisk with a radius of 13.5 μm operating without a heatsink for cooling. A modulation curr…

    Date Published:
    2019-06
    Record Visibility:
    Public
  • Author(s):
    Y. Pang, Y. Yang, T. Curtis, S. Luo, D. Huang, Z. Feng, J. O. Morales-Ferreiro, P. Sapkota, F. Lei, J. Zhang, Q. Zhang, E. Lee, Y. Huang, R. Guo, S. Ptsinska, R. Roeder, T. Luo
    Abstract:

    © 2019 American Chemical Society. Polymers with superior mechanical properties are desirable in many applications. In this work, polyethylene (PE) films reinforced with exfoliated thermally reduced graphene oxide (TrGO) fabricated using a roll-to-roll hot-drawing process are shown to have outstanding mechanical properties. The specific ultimate tensile strength and Young’s modulus of PE/TrGO films increased monotonically with the drawing ratio and TrGO filler fraction, reaching up to 3.2 …

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    Public
  • Author(s):
    K. Manukyan, C. Fesano, A. Majumdar, G. Peaslee, M. Raddell
    Abstract:

    This work presents results of macro, micro, and nanoscale surface characterization for a set of Roman denarii, ranging from 136 BCE to 240 CE, using large-scale X-ray fluorescence (XRF) mapping, particle-induced X-ray emission (PIXE) spectroscopy, focused-ion-beam-assisted scanning electron microscopy (FIB-SEM) with energy dispersive spectroscopy (EDS). The combination of XRF and PIXE, with varying beam energies, allowed for visualization and quantification of individual elements as a functio…

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  • 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
    Record Visibility:
    Public
  • Author(s):
    J. M. Pauls, N. F. Shkodich, A. S. Mukasyan
    Abstract:

    We report the results from the investigation of the mechanisms of self-sustained reaction in mechanically induced TiN/B nanocomposites. The exothermic displacement reaction, 3B + TiN → BN + TiB2, with an adiabatic reaction temperature of 1905 K, was initiated through two different means: localized thermal heating and mechanical stimulation by high-energy ball milling. Comprehensive studies strongly indicate that the chemical interaction in the system involves three main stages. Solid-state ma…

    Date Published:
    2019-04
    Record Visibility:
    Public
  • Author(s):
    R. Zhao, B. Grisafe, R. K. Ghosh, K. Wang, S. Datta, J. Robinson
    Abstract:

    The 1T phase of tantalum disulfide (1T-TaS 2 ) possesses a variety of charge-density-wave (CDW) orders, and as a result, it attracts an increasing amount of academic and technological interest. The 1T phase of tantalum disulfide (1T-TaS 2 ) possesses a variety of charge-density-wave (CDW) orders, and as a result, it attracts an increasing amount of academic and technological interest. Researchers have devoted tremendous efforts towards understanding the impacts of doping, alloying, intercalat…

    Date Published:
    2019-03
    Record Visibility:
    Public