Materials Literature
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Abstract FTIR and NMR measurements were used to infer structural formulas for the heat stabilizers dibasic lead phosphite, tribasic and tetrabasic lead sulfates, and basic lead carbonate. These compounds are not the customarily written double salts of lead oxide or hydroxide, but distinct species capable of rapid HCI…
Rotational moulding appears to be a simple processing method for manufacturing hollow plastics but in fact it involves a complex interaction of many variables. During bi-axial rotation, the plastic powder moves about inside the mould and will subsequently melt and form a layer on the inside surface of the mould. Numer…
A group of unusual Diploneis species has been examined using light and scanning electron microscopy. Diploneis sejuncta is peculiar in Diploneis because its longitudinal canals are separated from the raphe sternum furrows, whereas in most other species they are adjacent. Diploneis sejuncta f. constricta has also been…
A study about the aggregation-precipitation processes of divalent europium ions in mixed potassium halides (Cl/Br) has been carried out. Quenched samples lead to a single emission band at 418 nm, which compared with the emission observed in the corresponding europium doped non-mixed alkali halide crystals, appears per…
We have observed that it is possible to direct bond copper to copper at low temperature. For sputtered Cu surface on silicon wafer without any further surface planarization, we determined that 100°C temperature and uniform pressure (10 7 N/m 2 ) condition for three hours can produce a very strong Cu–Cu bond. A straigh…
In this work, the generation of Y-zeolite-entrapped zinc tetra(3,4-pyridine)porphyrazine (ZnPz-Z) at several loading levels is reported. The ZnPz-Z samples were obtained using the template synthesis method involving condensation of 3,4-dicyanopyridine (DCP) around Zn(2+) cations which had been ion-exchanged into the Y…
Investigations of the photoluminescence of PbS-EuS superlattices deposited on (111)DaF2 substrates are presented. Quantum-size and deformation effects in photoluminescence spectra are observed. The strain-induced gap shift and valence-band offset is determined from experimental results. A strong stimulated photolumine…
Anti-mine blast deflectors are now used as a standard countermeasure to reduce land mine effects on a vehicle's occupants, increasing their chances of survival. The blast deflectors are submitted to an impulse from the soil ejecta and detonation products resulting from a mine explosion. This memorandum presents algebr…
Small-angle X-ray scattering (SAXS) patterns from slit cameras (`Kratky cameras') require a subsequent desmearing procedure in order to obtain the pinhole scattering curve that is suitable for subsequent structure analysis. Since the corresponding integral equation contains a singularity, its solutions are usually uns…
Abstract Poly(ethylene oxide) (PEO) with the average molecular weight of 500, 1000, or 1900 having methane sulfonamide lithium salt in both chain ends was used as matrix to solubilize lithium bis-(trifluoromethane sulfonyl) imide (LiTFSI). Ionic conductivity of the above-mentioned PEO/salt hybrid was improved by the a…
Temperature has strong effects on the leaching behavior of the 90-19/U simulated high-level waste glass form. The Arrhenius equation is used to determine the change in the glass corrosion mechanism throughout the different temperature ranges. The apparent activation energies have been obtained for different leaching c…
Portal proteins are cyclical oligomers which play essential roles in bacteriophage pro-capsid formation, DNA packaging, and in connector formation. Bacteriophage SPP1 portal protein (gp6) is a turbine-like molecule with 13-fold symmetry [Dube et al. (1993) EMBO J. 12, 1303-1309]. The purified protein was crystallized…
ABSTRACT: We present surface analysis of close-spaced sublimated (CSS) CdTe after various pre-contact treatments. Our methods include Auger electron spectroscopy (AES), x-ray photoelectron spectroscopy (XPS), and grazing-incidence x-ray diffraction (GI-XRD). XPS and GI-XRD analyses of the surface residue left by our s…
The effect of additives commonly used in PVC processing on the tensile behaviour of microceliular PVC was explored. Microceliular foams were produced from three different PVC formulations - one with a full range of additives, and two others with a minimum of additives. All formulations contained a basic level of inter…
2,4-Pentanedione, also called acetylacetone (Hacac) is a precursor that has been considered for copper etching, or as a carrier for copper in copper deposition. Generally, 2,4-pentanedione is less effective than other similar molecules. In this article, temperature-programmed desorption was used to examine the decompo…
The multisolution strategies for direct phasing at very low resolution, such as the few atoms model technique, result in a number of alternative phase sets, each of them arising from a cluster of closely related models. Use of a Monte-Carlo type computer procedure is suggested to choose between the possible phase sets…
The wurtzite-sphalerite dimorphism of CdSe is studied by following the effect of high-energy mechanical grinding on the wurtzite form. X-ray powder-diffraction patterns are collected at different grinding times. A drastic modification in the initial wurtzite pattern is found already after 90 min grinding. The main eff…
Polyurethanes are the single most versatile family of polymers with a wide range of applications. There is a substantial need for the development of polyurethane materials with low heat release rate and low smoke release rate. In this study, an extensive series of elastomeric polyurethanes based on diphenylmethane-4,4…
Intimate mixtures of Cr 2 O 3 /ZrO 2 (2.5Y) in the Cr 2 O 3 ‐rich region are produced at low temperatures from amorphous materials prepared by the hydrazine method. Spark plasma sintering (SPS) has been performed for 10 min at 1300°C and 30 MPa. Composite ceramics with homogeneously dispersed fine ZrO 2 (0.2 µm) give…
Tungsten oxide films of 240–1080 nm thickness were deposited on indium tin oxide (ITO) coated glass substrates using an electrochemical deposition technique. All films were amorphous, as proved by X-ray diffraction (XRD), and had an electrical resistivity of 10 6 Ω·cm and spectral transmittance exceeding 75% in the vi…