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  • Author(s):
    Randal Marks, Joseph Seaman, Patricia Perez-Calleja, Junyeol Kim, Robert Nerenberg
    Abstract:

    Heterogeneous hydrogenation catalysis is a promising approach for treating oxidized contaminants in drinking water, but scale-up has been limited by the challenge of immobilization of the catalyst while maintaining efficient mass transport and reaction kinetics. We describe a new process that addresses this issue: the catalytic hydrogel membrane (CHM) reactor. The CHM consists of a gas- permeable hollow-fiber membrane coated with an alginate- based hydrogel containing catalyst nanoparticles. …

  • 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
  • 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 …

  • 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
  • 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…

  • 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
  • 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
  • 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
  • Author(s):
    T. Finamore, T. Curtis, J. V. Tedesco, K. Grandfield, R. Roeder
    Abstract:

    Gold nanoparticles and computed tomography were used synergistically to enable nondestructive, longitudinal, and volumetric measurement of collagen scaffold degradation. Biodegradable materials, such as collagen scaffolds, are used extensively in clinical medicine for tissue regeneration and/or as an implantable drug delivery vehicle. However, available methods to study biomaterial degradation are typically invasive, destructive, and/or non-volumetric. Therefore, the objective of this study w…

    Date Published:
    2019-02
  • Author(s):
    R. Scheidt, B. Seger, P. Kamat, Tor Elmelund
    Abstract:

    MAPbBr3 and MAPbI3 films cast onto glass slides and physically paired together undergo halide exchange to form mixed halide films. The change in halide composition in these two ∼130 nm thick films occurs concurrently with Br− diffusing toward the MAPbI3 film and I− diffusing toward the MAPbBr3 film. The diffusion of these halide species, which is tracked through changes in the absorption, offers a direct measurement of thermally activated halide diffusion in perovskite films. The increase in …

    Date Published:
    2019-07
  • Author(s):
    A. E. Deatsch, A. J. Shogren, S. P. Egan, J. L. Tank, N. Sun, S. T. Ruggiero, C. E. Tanner
    Abstract:

    Rapid, sensitive, and quantitative protein detection is critical for many applications in medicine, environmental monitoring, and the food industry. Advancements in detection of proteins include the use of antigen-antibody binding; however, many current methods are time-consuming and have limiting factors such as low sensitivity and the inability to provide absolute values. We present a new high-throughput method for protein detection using light transmission spectroscopy (LTS), which can qua…

    Date Published:
    2019-02
  • Author(s):
    J. T. Miller, V. Danghyan, A. S. Mukasyan, E. E.Wolf
    Abstract:

    We report on the high activity and stability towards deactivation during ethanol decomposition of mono (Ni, Cu) and bimetallic Ni-Cu catalysts supported on ceria and silica that were prepared by impregnated support solution combustion synthesis (ISCS). Ni supported on ceria, behaves much like bulk Ni, as it deactivates within a few hours of time on stream (TOS). Addition of Cu improves the stability of ceria supported Ni-Cu bimetallic catalysts but it still deactivates during 10 h of TOS. Ni …

    Date Published:
    2019-02