Materials Literature
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The effect of amino (trimethylene phosphonic acid), (ATMP), molybdate and Zn 2+ on the inhibition of corrosion of mild steel in a neutral aqueous environment containing 60 ppm Cl ‐ has been evaluated by the weight ‐ loss method. It is found that the formulation consisting of 50 ppm ATMP, 300 ppm MoO 4 2‐ and 50 ppm Zn…
Because doping ions are mainly surrounded by solvent molecules in the early stages of sol—gel processing, the luminescence of rare-earth ions in such an environment is known to be very similar to that observed in aqueous solutions. Thus we performed a molecular dynamics simulation of the trivalent europium in aqueous…
A novel ionene elastomer (DPI) consisting of 2,2‘-bipyridinium units and poly(oxytetramethylene) (POTM) segments was synthesized by cationic polymerization of tetrahydrofuran followed by termination using 2,2‘-bipyridine. The molecular mass between the ionic sites was ca. 10 000 g/mol. The DPI film displayed a high te…
Abstract The molybdenum trihydrido complexes, [MoH3{[Ph2PCH2CH2P(Ph)C6H4-o]2(Ar)Si-P,P,P,P,Si}], which were readily formed by the thermal reaction of [MoH4(Ph2PCH2CH2PPh2)2] with arylsilanes, reacted with molecular dioxygen to give the unprecedented molybdenum(IV) peroxo type η2-O2 complexes, [MoH{[Ph2PCH2CH2P(Ph)C6H4…
In this work we present the results from studies on novel poly(arylene ether ketone)s, including gas permeability, wide-angle x-ray diffraction (WAXD), and dynamic mechanical analysis (DMA). Poly(arylene ether ketone)s containing 2,2′- and 3,3′-dibenzoylbiphenyl (DBBP) moieties were characterized to study the effect o…
Abstract Employing four mathematical models (first‐order, parabolic‐diffusion, Elovich and zero‐order), kinetics of potassium desorption from eight soils with and without cropping were studied to evaluate their ability in explaining K release from soils. The decline in the soil test K in cropped soils over original so…
<div class="htmlview paragraph">In order to evaluate the crash-worthiness of a car, the dynamic response of the car body has to be correctly obtained at each level of car velocity. For the dynamic analysis, the dynamic properties of auto-body materials need to be identified for various strain rates. One of the t…
A mathematical model to describe the reaction-bonded synthesis of silicon nitride is described. The process involves formation of a network of whiskers and flakes that progressively detach from the reacting solid silicon particles and cause product densification and macropore filling. In turn, this hinders nitrogen di…
Studies were conducted on the effect of cold work on stress corrosion cracking (SCC) of API X52 steel. For comparison, measurements were made on specimens with no notch and that were not cold-worked. The time to failure of cold-worked specimens was always shorter than that of the as-received specimens. Hydrogen conten…
Abstract Dynamic mechanical analysis was used to study the viscoelastic properties of two novel highly filled phosphate glass‐polymer melt blends to accelerate efforts to optimize their melt processing. The melt of one blend was thermally stable while that of the other blend was not, as evidenced by modulus growth ove…
Abstract The crystallization kinetics of previously oriented poly(ethylene terephthalate) (PET) sheets have been studied under unconstrained conditions, as functions of stretch ratio, mode of extension, and crystallization temperature. Isothermal and dynamic crystallization conditions have been utilized for the determ…
A simple theoretical model for the origin of spontaneous polarization in nanocrystals is developed. We propose that the origin of the spontaneous polarization is in the boundary layer between “cap” and the nanocrystal, and the internal electric field in the dot is due to the piezoelectric effect caused by the strain e…
Abstract The porosity and the formation factor of water-saturated porous glass specimens made from sintered spherical grains are determined from the dielectric dispersion measurements of the specimens. This is done by fitting the Mendelson et al. theory for a water-saturated porous glass specimen to the experimental d…
The novel compounds K2AuPS4 (1), Tl2AuPS4 (2), K2AuAsS4 (3), and KAu5P2S8 (4) have been synthesized by direct reaction of the elements with a molten alkaline polythiophosphate(arsenate) flux at 550°C. The crystal structures of these compounds have been determined by single-crystal X-ray diffraction techniques. 1, 2, a…
Thianthrene - 2,3,7,8 - tetracarboxylic dianhydride - 5,5,10,10 - tetraoxide (TADATO), a dianhydride having two sulfonyls between two phenyl rings, was synthesized and polymerized with several diamines by a two-step method. Tough polyimide membranes were obtained with flexible diamines but not with rigid diamines. Mos…
Patterns of N mineralization and P release were determined in two characteristic soils of the Andean-Patagonian Region (Andisol) and the transitional zone to the steppe (xeric Mollisol) amended with fish residues and biosolids. Residues were applied to the soils at rates of 10–20 g kg-1 and incubated for 112 d under c…
Methods developed originally to analyze domain motions from simulation [Proteins 27:425–437, 1997] are adapted and extended for the analysis of X-ray conformers and for proteins with more than two domains. The method can be applied as an automatic procedure to any case where more than one conformation is available. Th…
Sulfonated manganese(III) tetraphenylporphyrin supported on Amberlite IRA-900 ion exchange resin (MnTPPS-Ad) has been found to be a highly active and stable catalyst for olefin epoxidation and alkane hydroxylation by sodium periodate.
There has been a longstanding debate and controversy in the literature with regard to the determination by XPS of the exact oxidation state of a molybdenum species commonly observed in the passive films of stainless steel. In this paper we have compared both the XPS and ESR analyses of molybdenum oxyhydroxides previou…
We introduce a semischematic mode-coupling model to describe the slow dynamics in molecular liquids, retaining explicitly only the description of the center-of-mass degrees of freedom. Angular degrees of freedom are condensed in a $q$-vector independent coupling parameter. We compare the time and $q$ dependence of the…