Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials: Poster Session
Program Organizers: Haitao Zhang, University of North Carolina at Charlotte; Gurpreet Singh, Kansas State University; Kathy Lu, Virginia Tech; Edward Gorzkowski, Naval Research Laboratory ; Jian Shi, Rensselaer Polytechnic Institute; Kejie Zhao, Purdue University ; Michael Naguib, Tulane University

Tuesday 11:00 AM
October 1, 2019
Room: Exhibit Hall CD
Location: Oregon Convention Center

P1-102: Effect of Ca Addition on Grain Refinement of Fe-B-P-Cu Alloys : Je hyuk Oh1; Dae-Geun Nam1; 1Korea Institute of Industrial Technology (KITECH)
    Ca is immiscible element about Fe. It is known that Ca is located in Fe grain boundary during crystallization heat treatment when Ca is added in the alloy. The alloy ribbon for a specimen was processed by melt spinning and the content of Ca in the specimen was measured by ICP (ion coupled plasma). FIB (focused ion beam) was used to make a sample for TEM test. The microstructure and diffraction pattern of the sample was observed using TEM, and the position of Ca in the matrix was determined by EELS (electron energy loss spectroscopy), respectively. In the TEM analysis, it was observed that the Ca contained alloy had less grain growth than the Ca free alloy at the same heat treatment condition. In the diffraction pattern analysis, the ferrite was observed in the matrix. As a result of EELS mapping, Ca was existed the grain boundary of the ferrite.

P1-103: Gas Phase Sodium Flame Synthesis of Non-oxide Metallic Powders: Larry Wang1; Aamir Abid1; Mary Krause1; Geoffrey Smith1; Nick Yin1; Craig Sungail1; Gordon Smith1; 1Global Advanced Metals
    Nano-structured, high surface area metal or ceramic powders have a growing interest within many markets including energy conversion, catalysts, and electronic materials. Manufacturing high purity metal powders at an industrial scale is a challenge due to trace impurities impacting powder performance. In particular, oxygen, nitrogen, and carbon impurities can adversely affect the physical and chemical properties of refractory metals such as titanium, tantalum, tungsten, and niobium. Here we present a nanoscale alloy powder produced using a scalable sodium synthesis technology. Primary particle size and aggregate morphology of the resulting powder can be optimized for the given application by adjusting process parameters including optional metal or gas doping. In one such application, we adapt the powder for capacitor testing with promising electrical performance. We are also actively working with other industry partners to develop new applications for nanostructured alloy powders with tunable surface properties and different compositions.

P1-104: Structural and Magnetic Properties of NiO@MnxNi1-xO Core-Shell Nanoparticles Synthesized at Varying pH Values: Abdullah Al Shafe1; Robert Mayanovic1; Richard Wirth2; 1Missouri State University; 2GFZ German Research Centre for Geosciences
    Rocksalt-structured NiO@MnxNi1-xO core-shell nanoparticles (CSNs) synthesized in our lab have been shown to exhibit substantial magnetic coercivity and exchange bias effects. However, it is not known how these properties may be affected by the surface and/or interface morphological properties of these CSNs. The two-step synthesis process first involves the growth of NiO nanoparticles, followed by the epitaxial growth of a MnxNi1-xO shell over the NiO core using our hydrothermal method. The hydrothermal process involves protonation and deprotonation reactions occurring at the nanoparticle surface, that vary in extent depending upon the pH, which may in turn directly affect the final morphology of CSNs. Our initial characterization of a series of CSNs synthesized at pH values ranging from 2.5 – 7, suggests that there are significant morphological changes occurring within the 4 to 5 pH range. The full results from the structural and magnetic characterization of our NiO@MnxNi1-xO CSNs will be discussed.

P1-106: Electrochemical Performances of Biomass Carbons Derived from Cassava and Bamboo as Advanced Electrode Materials: Beatriz Vessalli1; Shakir Bin Mujib2; Waldir Bizzo3; Talita Mazon1; Gurpreet Singh2; 1Centro de Tecnologia da Informação Renato Archer (CTI); 2Kansas State University; 3University of Campinas
    Biomass derived carbons are among the most promising candidates for large-scale electrical energy storage devices owing to the low cost, abundance, and widespread of resources. Here, we report a simplistic synthesis process to prepare two types of biomass carbons derived from cassava stalks and bamboo consisting of direct pyrolysis of the ground samples at 750 C֯ for 4 hours. The electrochemical performances of the prepared biomass carbons were investigated in supercapacitors and lithium ion battery (LIB) systems as anodes which demonstrated a satisfactory coulombic efficiency and cyclic stability.

P1-108: Carbon Rich SiOCN Fibers from Silazane/PAA Hybrid Polymer: Zhongkan Ren1; Christel Gervais2; Gurpreet Singh1; 1Kansas State University; 2Sorbonne Université, Collège de France
    This research investigates synthesis of SiOCN polymer-derived ceramic fibers from Poly(acrylic acid) (PAA) and silazane hybrid polymer for high temperature application. Pre-ceramic polymer fibers were mechanically drawn from mixture of PAA and silazane compound. The pyrolysis for polymer-to-ceramic conversion was carried out in inert atmosphere at temperatures 600 to 800°C. Further characterizations on synthesized PDC fibers will be shown in the following sections.

P1-109: Particle and Grain Size Relationships in Environmentally Controlled - Pressure Assisted Sintering: Kevin Anderson1; James Wollmershauser1; Edward Gorzkowski1; Boris Feigelson1; 1U.S. Naval Research Laboratory
    Nanocrystalline ceramics, having a grain size of <100 nm, demonstrate superior properties to their coarser grained counterparts in diverse areas, including mechanical, electrical, and magnetic. Producing fully dense nanocrystalline ceramics requires the sintering of nanopowders such that densification is maximized while grain growth is minimized. By maximizing nanopowder surface energy through creation and preservation of pristine particle surfaces, sintering can be performed at lower temperatures. In conjunction with applied pressure, this approach, ‘environmentally controlled – pressure assisted sintering’ (EC-PAS), has been utilized to produce nanocrystalline ceramics in multiple material systems. The role of EC-PAS parameters, including the relationship between nanopowder particle size and the sintered grain size, will be explored.

P1-110: Understanding Crystallization Behavior within Microfluidic Droplets : Shohom Bose-Bandyopadhyay1; Kiryakos Mutafopulos2; Ashley Vu3; David Weitz2; Susmita Bose3; 1Pullman High School; 2Harvard University; 3Washington State University
    The objective of this study is to understand the crystallization behavior using polydimethylsiloxane (PDMS) - based microfluidic devices within droplets. First, PDMS based microfluidic droplet making device was designed and fabricated to produce uniform emulsion. To achieve complete crystallization within the droplet, several parameters were varied, especially crystallization before exiting device and without breaching fluid/fluid interface to form uniform crystals. Those parameters include solution concentration, flow rates and temperature to understand their influence on crystallization kinetics. For the initial optimization, an aqueous sodium acetate solution was used, though differing pressures within the device made it extremely difficult to control when crystallization occured without changing concentrations and controlling other parameters. By changing concentration, temperature, and water of hydration in materials, better results were achieved. The presentation will discuss influence of these parameters on crystallization in microfluidic droplets.

P1-111: Study on the Safety and Longevity of Nanometer Insulation Materials: Yu Yanwen1; 1Baoshan Iron Steel Co.Ltd
     This paper intends to optimize the configuration of Baosteel tundish lining masonry structure and thermal insulation technology, and conclude a safe, stable, long-life, energy-saving and thermal insulation tundish lining refractory configuration technology to reduce the temperature drop during the tundish casting process. And temperature fluctuations, the temperature deviation of molten steel is reduced by 10.31%, the fluctuation range is narrowed, and the quality of the slab is improved. At the same time, by establishing a semi-automatic tundish refractory pouring operation production line, the refractory consumption is reduced and the labor productivity of the operators is improved.