Materials Literature
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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-…
Alumina‐rich mixtures of La 2 O 3 and Al 2 O 3 have equilibrium phases that are perovskite (LaAlO 3 ) and β‐alumina (LaAl 11 O 18 ). Annealing initially glassy samples with compositions 3La 2 O 3 –5Al 2 O 3 or 11La 2 O 3 –14Al 2 O 3 between 860° and 1075°C creates a metastable state that is clearly detected by X‐ray d…
Although the interconversion between C4 and C3 compounds has an important role in overall metabolism, limited information is available on the properties and regulation of enzymes acting on these metabolites in hyperthermophilic archaea. Malic enzyme is one of the enzymes involved in this interconversion, catalyzing th…
Cotton threads bearing adsorbed branched polyethylenimine–organophosphorous hydrolase (BPEI/OPH) multilayers are woven into cotton cloth (CC) that actively hydrolyzes methyl parathion (MPT) in solution to p-nitrophenol (PNP) over several weeks. These results form the basis for smart fabrics capable of remediation of e…
Nanocrystalline boron carbide (B 4 C) was synthesized via a solvothermal reduction of carbon tetrachloride using metallic lithium as reductant in the presence of amorphous boron powder at 600°C in an autoclave. The X‐ray diffraction pattern of the product powder was indexed to the hexagonal B 4 C phase, with lattice c…
Abstract Scrap rubber recycling combined with waste leather particles in natural rubber compounds has been studied. The effect of leather and scrap rubber loading on vulcanization characteristics of natural rubber compounds has been evaluated. The presence of leather was found to reduce the scorch time and increase th…
Ceramic foams with porosity exceeding 90% were prepared by direct foaming and casting of aqueous suspensions containing cetyl trimethyl ammonium bromide (CTAB) as a foaming agent. Foaming of the suspensions, particularly with lower viscosity, was initially non‐homogeneous but the foam appeared to homogenize with milli…
Impact tests using a soft gelatin projectile were performed to identify failure modes that occur at high strain energy density during impact loading. Failure modes were identified for aluminum plates and for composites plates and half-rings made from triaxial carbon fiber braid having a 0∕±60° architecture. For alumin…
One-dimensional supramolecular structures self-assemble from irregular, highly branched, flexible amphiphiles containing a polyester core and an alkyl- or anthracene-functionalized shell. A combination of intermolecular interactions and steric limitations cause the structures to form nearly perfectly organized microfi…
Five amphiphilic meso-disubstituted porphyrins bearing one polar group were synthesized, and their monolayer films were prepared. Their limiting molecular areas obtained from pi-A isotherms were 0.5-0.6 nm2, which were smaller than those of the corresponding meso-tetrasubstituted porphyrins. At the air-water interface…