Materials Literature
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Radiation-induced damage to homo-oligonucleotides is investigated by electron-stimulated desorption of neutral fragments from chemisorbed organic films. Six and 12 mers of cytidine phosphate (poly dCs) and thymidine phosphate (poly dTs) are chemisorbed from various solutions onto a crystalline gold substrate by a thio…
Thin films of nitrogenated amorphous carbon (a-CNx) were deposited on Si(100) substrates by reactive radio frequency sputtering using a gas mixture of Ar and N2 at a total working pressure of 3 mTorr. X-ray photoelectron spectroscopy (XPS) showed that the films consisted of amorphous carbon (a-C) containing a β-C3N4-l…
Formation of secondary phases and diffusion of cations in diffusion couples of yttria‐stabilized zirconia and lanthanum manganite substituted with 0 to 60 mol% strontium have been studied by scanning electron microscopy and energy dispersive X‐ray spectroscopy. Only the primary phases were observed after 120 h at 1200…
Drawable water-swollen cellulose films were prepared by coagulating in water two different cellulose organic solution systems. The drawability of the water-swollen films was dependent on the rate of coagulation. Transparent films prepared by the slow coagulation showed good drawability and had a maximum draw ratio of…
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry was used to deduce the three-dimensional structure of a complex silsesquioxane polymer. Four distinct levels of structure were observed in the mass spectrum. The overall shape of the peak distribution was typical of polymers formed by condens…
<div class="htmlview paragraph">Diesel particulate filter regeneration (through oxidation of the collected soot particles) is not currently possible under all engine operating conditions without additional external thermal energy. The exploitation of the autothermal properties of the reverse flow reactor has bee…
(1999). Invited article Liquid crystal templating of porous materials. Liquid Crystals: Vol. 26, No. 3, pp. 305-339.
High-quality, single-Frain samples of decagonal Al-Ni-Co quasicrystals with volumes of up to 0.8 cm3 and an approximate composition of Al72Ni11 Co17 have been grown from the ternary melt. The precise growth methods and conditions are discussed in detail. X-ray diffraction patterns of crushed single grains and of singl…
Samaria‐doped ceria solid oxide fuel cells (SOFC) single cells have demonstrated power densities > 250 mW / cm 2 at 700°C and stable performance for 15,000 h. Though encouraging, issues of stack performance and efficiency due to mixed conduction remain. Stacks operated on H 2 / 3 % H 2 O show approximately half the po…
We report the effect of light-induced sliding of the nematic director over an isotropic boundary surface in an azo-dye doped liquid-crystal cell. We show that illumination of the cell with polarized laser light induces transient dynamic sliding followed by permanent reorientation of the director. The two effects are i…
The photophysical properties of a tripartite supermolecule comprising zinc porphyrin and ruthenium(II) tris(2,2‘-bipyridyl) terminals separated by a trans Pt II bis-σ-acetylide fragment bearing tri- n -butylphosphine residues have been recorded in solution. Thus, excitation into the ruthenium(II) tris(2,2‘-bipyridyl)…
Tb‐doped Y 2 SiO 5 phosphor particles were prepared directly by a continuous droplet‐to‐particle preparation process using an ultrasonic spray generator. The photoluminescence characteristics of as‐prepared and calcined particles were investigated. The particles of Y 2 SiO 5 prepared below 1100°C had poor crystallinit…
The electrical resistivity of epitaxial $({\mathrm{La}}_{0.5}{\mathrm{Pr}}_{0.5}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ films deposited on single crystalline ${\mathrm{LaAlO}}_{3}$ substrates was studied at temperature and magnetic fields ranging from 4.2 to 300 K and from 0 to 3 T, respectively. On cooling fr…
The onset temperature for the curing reactions of phenylethynyl-terminated oligomers can be lowered by the addition of disulfides which dissociate to form thiyl radicals on heating. Studies using model compounds have shown that the products obtained from these reactions are structurally different from those obtained i…
Abstract An artificial neural network with back-propagation architecture has been applied to the problem of the quantitative analysis of simulated clay mixtures from synthetic X-ray diffraction (XRD) data. A ‘clay characterization function’ (CCF) has been devised that combines information from two clay XRD peaks into…
Stress distribution and diamond phases in polycrystalline diamond film have been investigated by micro-Raman spectroscopy. Intensity, lineshape and peak position of the diamond Raman line largely change on the film surface, particularly if grain center and grain boundary regions are compared. Whereas in the center of…
Abstract Soft, low‐compression‐set and chemically resistant TPEs have been developed from advanced PVC blend technology. These blends have low‐temperature flexibility comparable to that of commonly used TPEs and can be made flame‐retardant. These new TPEs are suitable for applications in consumer products, automotive,…
This paper presents the results of research on the utilization of slag produced as the waste material of metallic magnesium production. This material is a fine powder with a high magnesium content. The characterization of slag was performed by XRD, DTA and TG analysis. Chemical composition and mechanical properties of…
In the present investigation the separate and combined effects of cerium and lanthanum on the graphite formation in ductile cast iron have been investigated, using directional solidification. It is shown that both elements are carbide formers in that they increase the undercooling for graphite formation. The observed…
Abstract The practical application of commercial polymer flame retardants can no longer meet present requirements in terms of effectiveness or hazard. The most effective flame retardants used thus far have been halogen‐, phosphorus‐, antimony‐, and heavy‐metal‐based compounds, which, however, have the most environment…