Materials Literature
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Dense SiC/MoSi 2 nanocomposites were fabricated by reactive hot pressing the mixed powders of Mo, Si, and nano‐SiC particles coated homogeneously on the surface of Si powder by polymer processing. Phase composition and microstructure were determined by methods of X‐ray diffraction, scanning electron microscopy, transm…
High-temperature quantum chemical molecular dynamics simulations (QM/MD) based on the density functional tight binding (DFTB) method were performed on SiC surfaces and compared with experimental observations. Following the nucleation of nanocaps on the C face of SiC(0001̄), substantial carbon nanotube (CNT) growth is…
Compact and uniform zirconium carbide (ZrC) coatings have been successfully deposited on coated fuel particles using a ZrCl 4 +H 2 +Ar+C 3 H 6 gas mixture. Zirconium tetrachloride (ZrCl 4 ) powder feeder was especially designed and manufactured to control accurately the flow rate of ZrCl 4 and produce ZrC on an indust…
Structural evolutions of tungsten oxide(WO3) samples on different substrates are studied using Raman spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The WO3 samples are prepared using hot-filament CVD techniques. The focus of the study…
A magnetic field-assisted ball milling has been employed for the preparation of SmCo 5 + 10 wt% Fe nanocomposite powders in the presence of oleic acid as surfactant. Milling experiments were also carried out without using surfactant and the nanocomposite powders so obtained, with and without surfactant, were investiga…
Phase change nonvolatile memory devices composed of the SeSbTe chalcogenide semiconductor thin film were fabricated.The resistivity of the SeSbTe system was investigated to apply to multi-level data storage.The chalcogenide semiconductor acts as a programmable resistor that has a large dynamic range.The resistance of…
Steady state and ultrafast transient absorption studies have been carried out for gold, nickel, and palladium high aspect ratio nanorods. For each metal, nanorods were fabricated by electrochemical deposition into approximately 6 microm thick polycarbonate templates. Two nominal pore diameters(10 and 30 nm, resulting…
In order to improve the mechanical properties of Ti 3 AlC 2 , near‐fully dense Ti 3 AlC 2 /TiB 2 composites were synthesized using Ti, Al, graphite, and B 4 C powders as the initial materials. Compared with monolithic Ti 3 AlC 2 , the composites exhibit a much higher strength (for the compressive strength, from initia…
Experimental solubilities of cyclotrimethylenetrinitramine (RDX) in binary solvent mixtures, such as γ-butyrolactone + water, cyclohexanone + water, N -methyl pyrrolidone + water, and acetone + water, were measured over the temperature range of 273.15 K to 363.15 K. The enthalpy of dissolution was determined experimen…
The electronic structure and spectral properties of self-trapped holes (STH's) in $\mathrm{Si}{\mathrm{O}}_{2}$ are revisited using pure and hybrid density functional theory (DFT) approaches and cluster models. The structure and electron spin resonance (ESR) parameters [hyperfine coupling constants (hfcc's) and $g$ fa…
Using magnetization measurements and multifrequency high-field electron paramagnetic resonance, the largest zero-field splitting for any individual isolated Mn(II) ion has been found in a polyoxometalate complex, suggesting that the inorganic ligand induces large Ising-type magnetic anisotropy.
ZnO, SnO 2 and zinc stannate thin films were deposited on commercial microscope glass and UV fused silica substrates using filtered vacuum arc deposition system. During the deposition, the substrate temperature was at room temperature (RT) or at 400 °C. The film structure and composition were determined using x-ray di…
With 4,4,5,5-tetramethyl-2-(3,5,5,8,8-pentamethyl-5,8-disila-5,6,7,8-tetrahydro-2-naphthyl)-1,3,2-dioxaborolane ( 5 ) a new building block for the synthesis of biologically active 5,8-disila-5,6,7,8-tetrahydronaphthalene derivatives has been made available. The high synthetic potential of 5 has been demonstrated by th…
Titanium dioxide (TiO 2 ) thin films were synthesized on (1 0 0) Si substrates by reactive pulsed laser deposition (PLD) technique. A frequency quadrupled Nd : YAG (λ = 266 nm, τ FWHM ≅ 5 ns, ν = 10 Hz) laser source was used for the irradiations of metallic Ti targets. The experiments were performed in controlled oxyg…
The conditions for the high-yield preparation of two crystalline solid solution precursors to high-purity gadolinia-doped ceria (GDC) powder have been systematically investigated. Cerium−gadolinium solid solution formate and carbonate precursors were obtained directly from solution in crystalline form with small parti…
Nanocrystalline ZnS films have been grown on glass substrates by close spaced evaporation at various deposition rates, with a constant substrate temperature of 300 °C. The x-ray photoelectron spectroscopy studies revealed that nearly stoichiometric ZnS layers were grown at deposition rates in the range 20–30 Å s−1. Th…
In this paper, we present a mesoscopic model for melt of polyphenylene dendrimers. The coarse-graining force field is built on the basis of the distribution functions derived from atomistic simulations, and thus it takes into account the chemical details of the system. Owing to the reduced number of particles, simulat…
We investigated the inhomogeneous electronic properties at the surface and interior of $\mathrm{V}{\mathrm{O}}_{2}$ thin films that exhibit a strong first-order metal-insulator transition (MIT). Using the crystal structural change that accompanies a $\mathrm{V}{\mathrm{O}}_{2}$ MIT, we used bulk-sensitive x-ray diffra…
Single-walled carbon nanotubes (SWNTs) functionalized with organic molecules bearing high-scattering element tags have allowed direct visualization of modification on the atomic scale. The inclusion of these tags in protecting groups allowed their subsequent removal and reincorporation to allow visualization of corres…
Silks are strong protein fibers produced by a broad array of spiders and insects. The vast majority of known silks are large, repetitive proteins assembled into extended beta-sheet structures. Honeybees, however, have found a radically different evolutionary solution to the need for a building material. The 4 fibrous…