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  • Author(s):
    R. Marks, K. Doudrick
    Abstract:

    Chlorite (ClO 2 - ) is a disinfection byproduct formed during drinking water treatment when source waters with a high oxidant demand are disinfected with chlorine dioxide. This study investigated the reduction of… Chlorite (ClO 2 - ) is a disinfection byproduct formed during drinking water treatment when source waters with a high oxidant demand are disinfected with chlorine dioxide. This study investigated the reduction of ClO 2 - using a visible light (Vis) active photocatalyst, bismuth va…

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    Jae Hyun Park, Eamonn Kennedy, Mohammad Hokmabadi, Lisa Almonte-Garcia, Li Ding, Narayana Aluru, Gregory Timp
    Abstract:

    The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer- diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in pores <0.24 nm in diameter—the size of a water molecule—indicating that permeating ions have a grossly distorted hydration shell. Analysis of the current noise powe…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Seog Joon Yoon, Rizwan Khan, Junkhyun Lee, Jin Ho Bang
    Abstract:

    ABSTRACT: Despite the successful launch of Au nanoclusters (NCs) in light energy conversion applications, the utilization of Ag NCs has been limited by their instability under continuous illumination. The main cause of photoinduced degradation pathways remains elusive. Hence, understanding the underlying mechanism behind the low stability is an urgent task to provide a new impetus for the development of Ag NCs. The slow regeneration of Ag NCs by a redox couple leads to holes in the NCs, which…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Zhe Cheng, Yee Rui Koh, Habib Ahmad, Rejiu Hu, Jingjing Shi, Michael Liao, Yekan Wang, Tingyu Bai, Ruiyang Li, Eungkyu Lee, Evan Clinton, Christopher Matthews, Zachary Engel, Luke Yates, Tengfei Luo, Mark Goorsky, William Doolittle, Zhiting Tian, Patrick Hopkins, Samuel Graham
    Abstract:

    A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding and mixing, surface chemistry, crystal orientation, roughness, and interfacial disorder. This is especially true for metal-nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron-phonon coupling in the metal and acros…

    Date Published:
    2019-09
    Record Visibility:
    Public
  • Author(s):
    Zhe Cheng, Yee Rui Koh, Habib Ahmad, Rejiu Hu, Jingjing Shi, Michael Liao, Yekan Wang, Tingyu Bai, Ruiyang Li, Eungkyu Lee, Evan Clinton, Christopher Matthews, Zachary Engel, Luke Yates, Tengfei Luo, Mark Goorsky, William Doolittle, Zhiting Tian, Patrick Hopkins, Samuel Graham
    Abstract:

    A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding and mixing, surface chemistry, crystal orientation, roughness, and interfacial disorder. This is especially true for metal-nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron-phonon coupling in the metal and acros…

    Date Published:
    2019-09
    Record Visibility:
    Public
  • Author(s):
    Khachatur Manukyan
    Abstract:

    Cerium oxide (CeO2) is of great interest due to its unique properties. The formation of a single oxygen-vacancy during the reduction of CeO2 to Ce2O3 increases the Ce3+ fraction [1,2,3]. The valence and defect structures of CeO2 are dynamic and can change spontaneously or in response to physical parameters such as temperature, partial oxygen pressure, doping with other ions, and on applying an electric field or surface stress. Nano-scale CeO2 particles possess an increased Ce3+ concentration …

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    Min Wang, Zulei Zhang, Lei Li, X. Cao
    Abstract:

    The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized…

    Date Published:
    2019-02
    Record Visibility:
    Public
  • Author(s):
    Man Yang, Wei Lu, Renxi Jin, Xian-Chun Liu, Shuyan Song, Yan Xing
    Abstract:

    In this work, ZIF-67 is self-grown on the NiCo layered double hydroxide (NiCo-LDH) nanosheets-modified Ni foam (NF) surface. Its derivative, the hierarchically structured Co3O4/NiCo2O4/Ni foam (CO/NCO/NF) composite, is successfully fabricated by the oxidation of ZIF-67/NiCo-LDH/ NF, which exhibits excellent electrocatalytic performance. When assessed as an electrode for oxygen evolution reaction (OER), the CO/NCO/NF electrode shows low overpotentials of 320 and 407 mV at 10 and 50 mA cm−2, re…

    Date Published:
    2019-06
    Record Visibility:
    Public
  • 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
    Record Visibility:
    Public
  • Author(s):
    Kazuki Nomoto, Aditya Sundar, Kevin Lee, Mingda Zhu, Zongyang Hu, Edward Beam, Jinqiao Xie, Manyam Pilla, Xiang Gao, Sergei Rouvimov, Debdeep Jena, Huili Grace Xing
    Abstract:

    GaN PolarMOS is a vertical power transistor incorporating the unique polarization-induced bulk doping scheme in III-nitrides for the body p-n junction. We report the realization of this device, wherein the vertical channel, source contact, and body contact regions are successfully formed using three steps of selective-area epitaxial regrowth, all by molecular beam epitaxy (MBE). The fabricated PolarMOS has an excellent on-current of >500 mA mm−1 and a specific on-resistance of 0.66 mΩ · cm…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Tor Elmelund, Rebecca Scheidt, Brian Seger, Prashant Kamat
    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:
    2019-06
    Record Visibility:
    Public
  • Author(s):
    Zhuxin Dong, Jae Hyde Park, Eamonn Kennedy, Mohammad Hokmabadi, Lisa Almonte-Garcia, Li Ding, Narayana Aluru, Gregory Timp
    Abstract:

    The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer- diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in pores <0.24 nm in diameter—the size of a water molecule—indicating that permeating ions have a grossly distorted hydration shell. Analysis of the current noise powe…

    Date Published:
    2019-05
    Record Visibility:
    Public