Materials Literature
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A new Ni(III) compound, TlNiO3 has been prepared under high oxygen pressure. The pressure and temperature domain required to prepare pure TlNiO3 was found to be very narrow (P ≥ 7.5 GPa, 650 ≤ T ≤ 700 °C). TlNiO3 crystallizes in the GdFeO3-type perovskite structure with the following lattice parameters: a = 5.2549(1),…
A significant improvement (220%) is reported in the low voltage (2000 V) aging characteristics under cathodoluminescence (CL) excitation for ZnS phosphors coated with 1.0 wt % by the sol-gel technique. The formation of nanoscale uniform coating was confirmed by structural analysis. An improvement in chemical and therm…
Atomic force microscopy (AFM) was used to investigate the topographic characteristics of pitting sites during anodic galvanostatic etching of high-purity aluminum foils in hot baths containing HCl and Pit sites near pre-existing ridges formed by rolling are preferred, and the distribution of sites depends on the foil…
Yeast mitochondrial NAD(+)-specific isocitrate dehydrogenase is an octamer composed of four each of two nonidentical but related subunits designated IDH1 and IDH2. IDH2 was previously shown to contain the catalytic site, whereas IDH1 contributes regulatory properties including cooperativity with respect to isocitrate…
First-principles total energy calculations of the 2-nm clusters seen in high-perfection Al72Ni20Co8 decagonal quasicrystals demonstrate that chemical ordering between Al and transition metals in the central ring is energetically highly favorable. The chemical ordering introduces extensive structure relaxation and resu…
Introduction to the Rare Earths The Basics of Surface Structure Surface Structure Techniques Crystal Growth and Surface Preparation Rare-Earth Surface Science Quantitative Low-Energy Electron Diffraction Quantitative LEED Results Summary - Past, Present and Future.
The distributions for the activation energy E T and the capture cross section σ of deep levels were studied by spectral analysis of deep level transient spectroscopy (SADLTS) in order to characterize precisely the bulk traps and the interface states in the Pr- and Bi-type ZnO varistors. Three bulk traps (B1 ′ , B1 and…
Classical dynamics simulations, coupled directly with semiempirical molecular orbital theory, reveal some of the important oxidation chemistry occurring in single wall carbon nanotubes. Two chemisorption reactions, 1,2 and 1,4-cycloaddition with 1O2, are observed from the simulations, the latter determined as the kine…
The relationship between the pressure, volume, and temperature (PVT) of poly(vinylidene fluoride) homopolymers (PVDF) and poly(vinylidene fluoride)–hexafluoropropylene (PVDF–HFP) copolymers was determined in the pressure range of 200–1200 bar and in the temperature range of 40°C–230°C. The specific volume was measured…
The McMurry coupling of tris(5-formyl-2-thienyl)methanes affords novel cage molecules which are bicapped with tris(2-thienyl)methanes and where all the sulfur atoms of thienyl groups direct inward.
The henequen fiber/poly(hydroxybutyrate-co-hydroxyvalerate) resin (PHBV) interfacial shear strength was characterized by single-fiber fragmentation (SFF) (also called the single-fiber composite test) and microbond techniques. The surface microstructure and tensile properties of henequen fibers were characterized using…
Seasonally irrigated flooding and fluctuation of groundwater level control the redoximorphic features, saturation, and reduction of rice‐growing Ultisols in different landscape positions of Taiwan. The objective of this study was to quantify soil hydromorphology of an Ultisol toposequence with different saturation and…
The potential application of ultrasonic attenuation spectroscopy to the in situ examination of solution phase crystallization processes is examined through studies carried out on two organic compounds: urea and (L)-glutamic acid. For this study a commercial ultrasonic spectrometer [Ultrasizer by Malvern Instruments Lt…
Bioresorbable films can serve simultaneously as anatomic support structures and as drug delivery platforms. In the present study, bioresorbable PLLA films containing dexamethasone were developed through solution processing. The effect of processing parameters on the film morphology and the resulting mechanical propert…
Highly efficient, segmented thermoelectric unicouple incorporating advanced thermoelectric materials with superior thermoelectric figures of merit are currently being developed at the Jet Propulsion Laboratory (JPL). These segmented unicouples incorporate a combination of state-of-the-art thermoelectric materials base…
Poly(2-methyl aniline) or poly(ortho-toluidine), as ring substituted derivative of aniline, has been synthesized electrochemically in various concentrations of H2SO4 and HCl, and then characterized by cyclic voltammetry, as well as by impedance and Raman spectroscopy. The cyclic voltammograms of poly(o-toluidine) and…
An experimental setup for in situ infrared reflection absorption spectroscopy (IRAS) studies of atmospheric corrosion of confined metal surfaces is described. Information about the drying process of confined metal surfaces and the chemical composition and growth rate of the corrosion products in the confinement was ob…
The melting phase diagram of the two-component system 2-methyl-2-chloro-propane ((CH3)3CCl) and carbon tetrachloride (CCl4) has been determined by combining X-ray powder diffraction and thermal analysis. The isomorphism relation between the orientationally disordered (OD) stable face-centered cubic (FCC) phase of (CH3…
The proposed two-step preparation route for rare earth polyborates, i.e. dehydration of boric acid in the presence of rare earth oxide at low temperature followed by careful annealing at 700 °C, led to, for the gadolinium case, a new gadolinium pentaborate (GdB5O9) that can not be prepared by conventional high-tempera…
Ambient oxidation of nanosized silicon nitride powder produced by the vapour phase reaction of silicon tetrachloride and ammonia has been studied in this work. Aliquots of the powder were stored in argon gas, in dry air and in air of 80% humidity, and changes in the bulk and surface properties were investigated agains…