Materials Literature
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Sintering of a ZnO-MgO powder mixture under argon flow leads to the growth of elongated Mg doped ZnO structures such as stacks of nanoplates and rods with secondary nanowires in a comb-like arrangement. The nanoplates grow perpendicular to a central axis and have a six-fold symmetry. The hierarchical growth is related…
Experiments were conducted to investigate the deformation behaviors and fatigue properties of a superelastic thin tube (SE-tube) and a high-elastic thin wire (HE-wire) of TiNi alloy under conditions of pulsating-plane, alternating-plane and rotating bending. The main results obtained are summarized as follows. (1) The…
Nanotubes self-assembled from calixcrowns are utilized as an organic template for fabricating 1-D nanohybrids with noble metal nanoparticles attached to the nanotubes, which show good catalysis properties.
Fundamentals and recent research development of the structure and growth mechanism of anodic oxide films formed on pure aluminum and aluminum alloys such as A5052 and A6061 were described with focusing on their gas emission property in use of vacuum chambers. Highest volume gas emitted from anodized aluminum surface i…
The potential energy landscape of a flowing metallic glass is revealed using the activation-relaxation technique. For a two-dimensional Lennard-Jones system initially deformed into a steady-state condition through quasistatic shear, the distribution of activation energies is shown to contain a large fraction of low-en…
Amorphous and crystalline Fe-B alloys (5–25 at % B) were studied using pulsed 57Fe nuclear magneticr esonance at 4.2 K. The alloy samples were prepared from a mixture of the 57Fe and 10B isotopes by rapid quenching from the melt. In the microcrystalline Fe-(5–12 at %) B alloys, the resonance frequencies were measured…
Hydrogenated amorphous carbon (a-C:H) coatings have been obtained by means of acetylene decomposition in a non-self-sustained periodic pulse discharge (2A, 50 kHz, 10 μs) with hollow cathode. The discharge operation was maintained by plasma cathode emission with grid stabilization based on dc glow discharge. Using the…
Abstract not Available.
In this study, we have analyzed the mechanism of mixed conduction due to electrons and oxygen ions in (La0.75Sr0.25)MnO3.00 (LSM) and (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 (BSCF) by using the Rietveld refinement technique and the maximum entropy method (MEM). Using neutron diffraction measurements, we showed that the site occ…
The crystal structure of a unique type of vesuvianite with the space group P4/n [a = 15.576(2), c = 11.835(2) Å] formed by the retrograde alteration of gehlenite in high-temperature skarn at Kushiro (Tojyo, Shobara Hiroshima) southwestern Japan, is determined by single-crystal X-ray diffraction (R1 = 3.63%). Significa…
Abstract This paper considers main features of the formation of Al–Cu–Fe and Al–Cr–Fe coatings with complex crystalline structures using high-rate electron beam physical vapour deposition (EBPVD). It is shown that the deposition of the coatings at substrate temperatures below approximately 570 K leads to the formation…
Symmetric Taylor impacts of copper and RHA rods were performed using a light gas gun. High-speed photography was used in back illumination to obtain silhouette sequences of the deforming rods. Predictions were then made of the rod profiles using an Armstrong-Zerilli path- dependent model within a Lagrangian finite ele…
The formation of highly imperfect γ-Al 2 O 3 oxide prepared by calcining pseuodoboehmite and plasticized by organic acids was studied. The nature of the organic acid-aluminum hydroxide plasticizer was found to substantially influence the degree of γ-Al 2 O 3 structure imperfection estimated qualitatively as the differ…
The phonon wave packet technique is used in conjunction with the molecular dynamics simulations to directly observe phonon scattering at material interfaces. The phonon transmission coefficient of nanocomposites is examined as a function of the defect size, thin film thickness, orientation of interface to the heat flo…
Monografia sobre la aceria electrica, sus procesos y estudio de los distintos hornos electricos.
Fe-Cr ferritic alloys are applied for interconnects of solid oxide fuel cells (SOFCs) operated at around medium temperatures. The oxidation behavior of sheets with various thicknesses of Fe-22% Cr ferritic alloy, ZMG232L, was investigated. The oxidation rate of thin sheet was much higher than that of thick one because…
Strong circular dichroism is observed in core-level photoelectron transmission through a chirally-etched polycrystalline Au surface, consistent with a chiral dependence on the electron's orbital angular momentum.
The electrochemical oxidation of either open or closed metacyclophanene isomers, which is a positive-photochromic system due to open isomers being more stable than closed ones, quantitatively yields a stable fluorescent dihydropyrene intermediate, a well-known negative T-photochromic system where the closed form is mo…
We study the wetting energetics and wetting hysteresis of sessile and impacting water droplets on superhydrophobic surfaces as a function of surface texture and surface energy. For sessile drops, we find three wetting regimes on these surfaces: equilibrium Cassie at small feature spacing, equilibrium Wenzel at large f…
Shape memory polymers (SMPs) are materials with a great potential for future use in smart materials and structures.When heated from cold state (below the transformation temperature, which can either be the glass transition temperature or the melting temperature of the polymer) to hot state (above the transformation te…