Materials Literature
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The American National Standards Institute/NSF Standard 61, Section 8, is intended to protect the public from inline brass plumbing products that might leach excessive levels of lead to potable water. Experiments were conducted to examine the practical rigor of this test. Contrary to expectations, the test was not high…
The crystal structure and microstructure of bornite have been of great interest to mineralogists since the pioneering studies of Morimoto and his colleagues (Morimoto 1964; Koto and Morimoto 1975). Because many questions about bornite remain, we are re-examining its structure using HRTEM. Highresolution transmission e…
This study clarifies the fine structure of the vegetative and initial valves of Achnanthes yaquinensis and briefly compares them to other Achnanthes species. It also elucidates the structure of the perizonium, based on auxospore development in short-term cultures. The araphid valve has marginal ridges and terminal spi…
The new orthorhombic polymorph β-HgB 4 O 7 has been synthesized under high-pressure and hightemperature conditions in a Walker-type multianvil apparatus at 7.5 GPa and 600 °C. β-HgB 4 O 7 is isotypic to the known ambient pressure phases MB 4 O 7 (M = Sr, Pb, Eu) and the high-pressure phase β-CaB 4 O 7 crystallizing wi…
Generally, a liquid freezes exothermally on cooling and a crystal melts endothermally on heating. Here we report an opposite occurrence--a liquid's endothermic freezing on heating and the resulting crystal's exothermic melting on cooling at ambient pressures. C(p) decreases on freezing and increases on melting, and th…
The purpose of the present study is to consider the mechanism of oxidation of zirconia and related charge transfer at the oxygen/zirconia interface, focusing on yttria-stabilised cubic zirconia. The study considers unresolved problems concerning the electrochemistry of the oxygen/zirconia interface at elevated tempera…
Considerations of rotational invariance in one-dimensionally modulated systems such as smectics-A, necessitate nonlinearities in the free energy. The presence of these nonlinearities is critical for determining the layer configurations around defects. We generalize our recent construction for finding exact minima of a…
Ceria and ceria−zirconia desulfurization sorbents containing up to 20 mol % ZrO 2 were prepared using a coprecipitation method. XRD analysis indicated the formation of solid solutions of ZrO 2 in CeO 2 . ZrO 2 addition produced larger specific surface area, improved sintering resistance, and increased the reducibility…
Abstract Polymorphs α, β, and γ of Ga 2 O 3 having hexagonal (corundum‐type), monoclinic and cubic (spinel‐type) structure, respectively, were prepared in a high‐surface‐area form, and characterized by powder X‐ray diffraction. Nitrogen adsorption at 77 K showed these gallia samples to have specific surface areas of 7…
Solvent isotope effects on the interaction between the hyperbranched cationic polyelectrolyte, polyethylene imine (PEI), and the anionic surfactant sodium dodecyl sulfate (SDS) were investigated using potentiometric titration and eletrophoretic mobility measurements. In the basic pH range, a significantly higher fract…
Nearly athermal colloid-polymer mixtures were studied in the "protein limit." A fluid-fluid transition was observed in mixtures of stearyl-alcohol-coated silica particles and large polystyrene coils in toluene. The ratios of the polymer radius of gyration to the particle radii were q=4.1 and q=5.2. The binodal curves…
Nous avons determine l'agencement des atomes dans la pascoite, et nous l'avons affine jusqu'a un residu R egal a 0.0257 en utilisant des donnees tridimensionnelles obtenues avec rayonnement MoKα et un detecteur de type CCD. Ce mineral cristallise dans le groupe spatial C2/m, a 19.5859(6). b 10.1405(3), c 10.9110(3) A,…
Size effects on dissipated energy density and strength for quasi-brittle materials in compression are analysed theoretically and experimentally herein. By using a fractal fragmentation approach the dissipated energy density of a structural element under compression is deduced. In addition, the dissipated energy densit…
We have achieved single phase crystalline VO 2 film growth on sapphire (0001) and Si(100) substrates by the introduction of inductively coupled plasma (ICP)-assisted sputtering with an internal coil. The VO 2 film on Si substrate showed a metal–insulater (M–I) transition at a temperature of 60°C with three orders of c…
Hydrogen molecule adsorption and the reaction barrier for dissociation on the plutonium (111) surface have been studied in detail using the generalized gradient approximation to density functional theory. All calculations have been performed at both non-spin-polarized and spin-polarized levels of the theory. Weak mole…
Abstract Polyamidoamine (PAMAM) dendrimers up to the third generation were grown for the first time on the surface of a large‐pore (18 nm) Davisil silica support. The supported dendrimers of generations 0, 1, 2 and 3 were phosphinomethylated and complexed with rhodium. All the generations were found to be very active…
The diameter of single walled carbon nanotubes (SWNTs) determines the electronic properties of the nanotube. The diameter of carbon nanotubes is dictated by the diameter of the catalyst particle. Here we describe the use of iron nanoparticles synthesized within the Dps protein cage as catalysts for the growth of singl…
In a wide variety of high-voltage applications surface flashover plays a major role in the system's performance and yet has not been studied in great detail for atmospheric conditions with modern diagnostic tools. Environmental conditions to be considered include pressure, humidity, and gas present in the volume surro…
Abstract The physical properties and redox chemistry of perovskite-type LaCoO3 prepared by reactive grinding and by the citrate method, have been comparatively studied by temperature-programmed reduction (TPR), X-ray diffraction (XRD), N2 adsorption–desorption, and infrared spectroscopy (IR). XRD and N2 adsorption–des…
Diopside CaMgSi2O6 is an attractive material because of its multi applications. It was prepared by sintering the mixture at different temperatures (900°C-1300°C). Starting materials were pure SiO2 and dolomite raw materials. In order to improve the properties of sintered samples, such as the density egg white (ovalbem…