Materials Literature
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The electrochemical behaviour as well as the surface morphology characteristics of electrodeposited Zn and Zn-Co (≈3 wt-%) alloy coatings on low carbon steel samples, with and without included nanoparticles of organic co-polymers in their structure, are discussed. Their corrosion resistance and protective properties w…
Elliptically polarized light-scattering measurements were performed to investigate the dispersion behavior of multiwalled carbon nanotubes (MWNT). Xylene- and pyridine-derived MWNT powders were dispersed in water and ethanol in separate optic cells and allowed to sit undisturbed over a two-week time period after probe…
Photo-oxidation of arsenic trisulfide is the process whereby the surface of As2S3 glass is chemically altered and degraded due to exposure to light in the presence of water vapor. For as-deposited, thermally evaporated, As2S3 thin films the degradation process and the subsequent products formed vary as a function of i…
Si 1 − x Mn x alloy films of 50 nm thickness with 0.005⩽x⩽0.035 were grown by low-temperature molecular-beam epitaxy onto Si(100) substrates held at temperatures T in the range of 150°C⩽T⩽350°C. All films exhibit surface roughness with ∼20-nm-lateral and ∼1-nm-vertical length scales. This roughness is random for films…
This paper presents a method for modeling symmetric minor loops in hysteretic magnetic media. The method employs symmetric minor loops combined with certain segments of the initial magnetization curve to identify the classical Preisach model. The proposed method is simple and effective. It exploits the symmetric posit…
A numerical procedure for the prediction of fogging and defogging phenomena is presented. The simulation involves the solution of an air flow field along a cold solid surface, the evaluation of the unsteady conduction through the solid itself, and a model for the heat and mass transfer within the thin water layer on t…
The TMAP code has been upgraded to version 7, which includes radioactive decay along with many features implemented in prior versions. Pursuant to acceptance and release for distribution, the code was exercised in a variety of problem types to demonstrate that it provides results in agreement with theoretical results…
Based on magnetic structure and TEM studies of bornite we propose a new 2α Fe/Cu ordered superstructure model with symmetry F4̅3m and formula Cu 8 Fe 4 S8. First principles calculations (LAPW implemented in WIEN97 code) of two Fe/Cu ordering schemes indicate that, at the ground state, the Fe atoms should fill the tetr…
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,…