Materials Literature
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Mobile applications of hydrogen power have long demanded new solid hydride materials with large hydrogen storage capacities. We report synthesis of a new quaternary hydride having the approximate composition Li(3)BN(2)H(8) with 11.9 wt % theoretical hydrogen capacity. It forms by reacting LiNH(2) and LiBH(4) powders i…
Au and Ag nanoshells are investigated as substrates for surface-enhanced Raman scattering (SERS). We find that SERS enhancements on nanoshell films are dramatically different from those observed on colloidal aggregates, specifically that the Raman enhancement follows the plasmon resonance of the individual nanoparticl…
We present a detailed derivation and thin interface analysis of a phase-field model that can accurately simulate microstructural pattern formation for low-speed directional solidification of a dilute binary alloy. This advance with respect to previous phase-field models is achieved by the addition of a phenomenologica…
A class of highly fluorescent and photostable core-shell nanoparticles from a modified Stober synthesis in the size range of 20-30 nm is described. These nanoparticles are monodisperse in solution, 20 times brighter, and more photostable than their constituent fluorophore, and are amenable to specific labeling of biol…
Highly active and stable substrates for surface-enhanced Raman scattering (SERS) can be fabricated by using colloidal crystals to template gold nanoparticles into structured porous films. The structure-dependent performance of these SERS substrates was systematically characterized with cyanide in continuous flow milli…
Exciton absorption spectra of layered InSe and GaSe crystals electrochemically intercalated by hydrogen were investigated. It was found that the observed at T = 80 K non-monotonic shift of the exciton absorption peak n = 1 with growing hydrogen concentration x (here x is the amount of hydrogen atoms per a formula unit…
Near fully dense ZrO 2 (3Y)/Fe 3 Al composites with significantly improved fracture toughness were synthesized by hot‐press sintering at 1350°C. High fracture toughness and bending‐strength values, 36 MPa·m 1/2 and 1321 MPa, respectively, were achieved in 40 vol% Fe 3 Al composite ceramics, whereas those same values f…
Last decades the enhancement of optical transitions near metal surface was observed under study the optical processes (luminescence, Raman scattering, IR absorption). The effect consists in an essential increase of the intensity of transition (for example, an effective cross-section increases by factor 10 5 10 11 for…
We investigate the experimental detection of the electromagnetic radiation generated in the fast magnetization reversal in Mn 12 -acetate at low temperatures. In our experiments we used large single crystals and assemblies of several small single crystals of Mn 12 -acetate placed inside a cylindrical stainless-steel w…
Electrochemical cells consisting of a La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF)–Gd 0.2 Ce 0.8 O 2−δ (CGO) composite catalytic electrode and a CGO solid electrolyte were fabricated for direct nitric oxide (NO) decomposition, and the electrocatalytic properties and NO decomposition behaviors of the cells were investigate…
Microstructural changes during the oxygenation of YBCO bulks were studied. It was shown that a lower temperature of oxygenation leads to the formation of a denser structure of a / b - and c -macrocracks and causes faster and more homogeneous oxygenation of the sample. The opening of created macrocracks is the way in w…
Dense zircon (ZrSiO 4 ) bodies composed of equiaxed grains have been obtained from uniform nanosized powder compacts. The nanosized powders (20 nm in diameter) were prepared by the controlled hydrolysis with ammonium hydroxide of zirconyl chloride and tetraethoxysilane within reverse micelle nanocavities. The crystall…
The United States and its allies have been increasingly challenged by terrorism, and since the September 11, 2001 attacks and the war in Afghanistan and Iraq, homeland security has become a national priority. The simplicity in manufacturing chemical warfare agents, the relatively low cost, and previous deployment rais…
We have developed a system to quantitatively measure the permeation of gases through thin flexible substrates with high sensitivity. The system consists of two chambers, a high pressure side and an ultrahigh vacuum (UHV) side, separated by the flexible sample to be analyzed. The system is calibrated using a combinatio…
Treatment of [M(II)(en)(3)][OTs](2) or methanolic ethylenediamine solutions containing transition metal p-toluenesulfonates (M(II) = Mn, Co) with aqueous K(4)M(IV)(CN)(8).2H(2)O or Cs(3)M(V)(CN)(8) (M(IV) = Mo, W; M(V) = Mo) affords crystalline clusters of [M(II)(en)(3)][cis-M(II)(en)(2)(OH(2))(mu-NC)M(IV)(CN)(7)].2H(…
The interface structures of calcium–alumino–silicate (CAS) glassy intergranular films (IGFs) formed between the combined basal and prism orientations of α‐Al 2 O 3 crystals were studied using molecular dynamics simulations. Preferential adsorption of specific ions from the IGFs to the contacting surfaces of the alumin…
Measurement of specific heat ${C}_{p}(T)$ below $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ of melt-grown samples of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.3)$ and ${R}_{0.7}{A}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ $(R=\text{rare}\te…
We present a low-temperature inverse micelle solvothermal approach for the synthesis of germanium nanocubes using the surfactant heptaethylene glycol monododecyl ether as a capping agent. X-ray diffraction results indicate that the as-prepared nanocubes are diamond-type pure germanium. Transmission electron microscopy…
The preparation, X-ray crystallography and magnetic study of compounds PPh4[Cr(ampy)(CN)4]·H2O (1), PPh4[Cr(phen)(CN)4]·H2O·CH3OH (2), {[Cr(ampy)(CN)4]2Mn(H2O)2}·6H2O (3) and {[Cr(phen)(CN)4]2Mn(H2O)2}·4H2O (4), with PPh4+ = tetraphenylphosphonium cation, ampy = 2-aminomethylpyridine and phen = 1,10-phenanthroline, ar…
A comprehensive mathematical model is developed for the free-radical copolymerization of ethylene with various comonomers (e.g., vinyl acetate, methyl or ethyl acrylate, and acrylic or methacrylic acid) in high-pressure tubular reactors. Polar copolymers usually exhibit lower crystallinity and yield strength than low-…