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  • Author(s):
    Christopher E. Shuck, Alexander S. Mukasyan
    Abstract:

    Stochastically structured Ni/Al reactive nanocomposites (RNCs) were prepared using short-term high-energy ball milling. Several milling times were utilized to prepare RNCs with differing internal nanostructures. These internal structures were quantitatively and statistically analyzed by use of serial focused ion beam sectioning coupled with 3D reconstruction techniques. The reaction kinetics were analyzed using the electrothermal explosion technique for each milling condition. It is shown tha…

    Date Published:
    2017
  • Author(s):
    Khachatur V. Manukyan, Armenuhi V. Yeghishyan, Vardan Danghyan, Sergei Rouvimov, Alexander S. Mukasyan, Eduardo E. Wolf
    Abstract:

    In this work, we report a liquid-phase reduction method to prepare porous non-supported amorphous nickel catalysts with high surface areas (65–250 m2/g). A highly crystalline face center cubic Ni (fcc-Ni) catalyst with 110 m2/g surface area was also prepared by frontal crystallization of the amorphous nickel catalyst. The catalytic activity and stability of these catalysts for ethanol decomposition was investigated at different time on stream (TOS) to understand structural transformations occ…

    Date Published:
    2018
  • Author(s):
    Alexander S. Mukasyan, Alexander S. Rogachev
    Abstract:

    Combustion synthesis (CS) is a specific approach for fabrication of a variety of advanced materials through use of self-sustaining chemical reactions. Controlling over the microstructure of the material is a key factor in defining the maturity of a technology. In this work, we demonstrate that under specific conditions, morphology and microstructure of the initial reaction media do not change during the CS process. Thus, one may control the microstructure of CS materials by preparing the desi…

    Date Published:
    2017
  • Author(s):
    Joshua M. Pauls, Christopher E. Shuck, Alexander S. Rogachev, Alexander S. Mukasyan
    Abstract:

    Reactive Ni/Al composite particles with different internal microstructures were fabricated by ball milling (BM). The propagation of gasless combustion waves through the compacted composite particle media was investigated using high-speed microscope video recording (HSMVR), with a resolution of 10 μm/pixel and 21.25 μs/frame. The microstructural combustion-wave characteristics, including hesitation time, propagation step size, instantaneous velocity, intraparticle reaction time, and average co…

    Date Published:
    2017