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  • Author(s):
    Wenzheng Kuang, Chaochao Dun, Yanliang Zhang
    Abstract:

    Flexible thermoelectric (TE) devices hold great promise for energy harvesting and cooling applications, with increasing signi cance to serve as perpetual power sources for exible electronics and wearable devices. Despite unique and superior TE properties widely reported in nanocrystals, transforming these nanocrystals into exible and functional forms remains a major challenge. Herein, demonstrated is a transformative 3D conformal aerosol jet printing and rapid photonic sintering process to pr…

    Date Published:
    2019-01
  • Author(s):
    Hope Pearson, Devon Mason, Christopher Kegelman, Liming Zhao, James Dawahare, Melissa Kacena, Joel Boerckel
    Abstract:

    Insufficient blood vessel supply is a primary limiting factor for regenerative approaches to large bone defect repair. Recombinant BMP-2 delivery induces robust bone formation and has been observed to enhance neovascularization, but whether the angiogenic effects of BMP-2 are due to direct endothelial cell stimulation or to indirect paracrine signaling remains unclear. Here, we evaluated the effects of BMP-2 delivery on vascularized bone regeneration and tested whether BMP-2 induces neovascul…

    Date Published:
    2019-09
  • Author(s):
    Marshall McDonnell, Li Yang, Tiankai Yao, Jennifer E. S. Szymanoski, Joerg Neuefeind, Ginger Sigmon, Jie Lian, Matthew Tucker, Brian Wirth, Maik Lang, Raul Palomares
    Abstract:

    UO2.07 was characterized using neutron total scattering in order to elucidate defect morphology in the low oxygen-to-metal regime (x < 0.125 for UO2+x). Data were collected at temperatures (600 and 1000 °C) coinciding with the single-phase UO2+x region of the established phase diagram, and results were compared with data of stoichiometric UO2 collected at near-identical temperatures. Experimental data were modeled and interpreted using a holistic approach employing a combination of analyse…

    Date Published:
    2019-05
  • Author(s):
    Paolo Paletti, Ruoyu Yue, Christopher Hinkle, Susan Fullerton-Shirey, Alan Seabaugh
    Abstract:

    Two-dimensional van der Waals materials offer unique advantages for the development of band-to-band tunneling devices given their lack of dangling bonds, atomically flat thickness and steep band edges. Here, we present the experimental demonstration of an electric double layer (EDL) Esaki junction in synthetic WSe2 thin films. A Si-compatible process is developed for the fabrication of nanoscale FETs utilizing molecular beam epitaxy of WSe2 performed directly on top of a high-κ dielectric at ba…

    Date Published:
    2019-04
  • Author(s):
    Haylie L. Lobeck, Hrafn Traustason, Patrick Julien, John FitPatrick, Sara Mana, Jennifer Szymanowski, Peter Burns
    Abstract:

    The behaviours of two uranyl peroxide nanoclusters in water heated to 180 °C were examined by in situ Raman spectroscopy. Aqueous solutions containing the nanoscale uranyl peroxide cage clusters U 60 , [(UO 2 )(O 2 )(OH)] 60 60− , and U 60 Ox 30 , [{(UO 2 )(O 2 )} 60 (C 2 O 4 ) 30 ] 60− , were monitored by in situ Raman spectroscopy during stepwise heating to 180 °C. In solutions containing U 60 , clusters persist to 120 °C, although conversion of U 60 to U 24 , [(UO 2 )(O 2 )(OH)] 24 24− , o…

    Date Published:
    2019-04
  • 6

    Article

    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):
    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):
    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):
    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):
    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