Materials Literature
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For the directed synthesis of polyoxometalates the linking of the heteropolyanion 1 (schematic representation shown on the right) to form the dimeric anion 2 is extremely significant. The formation of the corresponding potassium salts of 1 and 2 from K2MoO4 and As2O3 is controlled merely by the pH value of the solutio…
Direct oxygen transfer to an olefinic bond is possible from the FeIII complex 2 if the double bond is electron-deficient as in 1 [Eq. (a)]. Complex 2 is analogous to intermediates proposed for cytochrome P450 type enzymes.
Ninety chiral centers and a molecular mass of 11354 Da are the outstanding features of the largest C 3 ‐symmetric, chiral dendrimer to date. As general approach to these chiral polyether compounds (1) styrenes or stilbenes are converted into 1,2‐diols by asymmetric dihydroxylation; (2) the resulting building blocks ar…
Two dianionic caps, linked by four lithium atoms, characterize the structure of the Li salt 1 of the tripodal ligand [S(NtBu)3]2−. On addition of THF to 1 one lithium atom leaves the inner region and coordinates to only two N atoms and a THF molecule. Oxidation of white 1 with O2 or iodine leads to a dark blue, stable…
High activity and negligible coke formation in the course of the catalytic partial oxidation of CH 4 to syngas are characteristics of the Ni/Ca 4‐ x Sr x TiO 3 catalyst, which is readily accessible by the citrate method from nickel nitrate, alkaline earth metal carbonates, and tetraisopropoxidotitanium. The properties…
Abstract Single crystals of (I) CuDyMo 2 O 8 and (II) CuYbMo 2 O 8 have been prepared by crystallisation from melts. Both com pounds crystallize with orthorhombic symmetry, space group D 15 2h -Pbca with (I): a = 10.195(1), b = 9.721(2), c = 14.563(3); (II): a = 10.094(6), b = 9.628(9), c = 14.467(8) Å, Z = 8. The cr…
The second in a two‐part series, describes various applications of calcium stearate in resins and resinous polymers. Focuses in particular on its use in polypropylenes and stynenes (e.g. as a slip agent, a dispersing agent, a light stabilizer, or a nucleating agent) and in polyvinyl chlorides (e.g. as a pure‐proofing…
<div class="htmlview paragraph">Our major challenge for future catalyst systems was to develop more thermally stable washcoats for close coupled operating conditions and for engines operating under high speed and load conditions. To design these future emission systems extensive research and development was unde…
An experimental study of the effects of bead-to-bead stepover, wire size, wire feed speed, voltage, flux chromium content, and polarity on dilution and ferrite in single-wire submerged arc cladding of ER309L on mild steel plate is described. Low dilution was found to be promoted by reduced stepover, reduced wire feed…
Describes the growth in industrial usage of GRP (glass fibre reinforced plastic) to control corrosion and, in particular, the use of DERAKANE, a vinyl ester used in GRP. Gives examples of its use in Germany, the UK and the USA. Concludes that the experience with GRP based on epoxy vinyl ester resins applications is ve…
Internal friction measurements were performed on plastically pre-deformed ultrapure nickel single crystals. Bordoni and Niblett-Wilks relaxation was observed. From the activation enthalpy of the Bordoni relaxation, H eff B = (0.19 ± 0.03) eV, the enthalpy of a single kink could be derived as H k = 0.093 eV applying Se…
Commercially available silica gel was derivatized with n-octadecyldimethylchlorosilane to produce inexpensive HPLC reverse-phase stationary support, which was used in separation experiments.
The cadmium complex Cd(CN)2·(18-crown-6) (1) was synthesized and its structure was determined by X-ray crystallography. The cadmium ion in 1 has a hexagonal bipyramidal geometry containing six equatorial oxygen atoms from the crown ether and two axial CN ligands. The NC-Cd-CN ‘rod’ is perfectly linear with an end-to-e…
Addition of lime to increase pH is generally required for soilless media based on acidic organic materials. Media pH may decrease over time as the result of addition of acidic fertilizers. The objectives of this research were to characterize reactions of conventional or finely ground limestone in soilless media and to…
The crystalline phase of a series of random 6/6.9 copolyamides was studied. The crystallization and fusion behavior, crystallography, and morphology were investigated. A decrease in melt crystallization temperature and rate, and an increase in cold crystallization temperature are caused by increasing either monomer co…
The preparation and characterization of the title complex, [Mn(Phen)2Cl2] are reported. The crystal structure determination shows that the two 1,10-phenanthroline ligands and two Cl-atoms form the pyramidally distorted octahedron around Mn(II). The chemically equivalent ligands play a different structural role in this…
<div class="htmlview paragraph">Fluid cavitation corrosion can cause severe damage and problems in many practical applications. A collapsing bubble produces pressure and thermal shock waves, and microjets. These intense local forces will erode material in the proximity of the collapsing bubble. The intensity of…
Article External cooling of a pressurized water reactor vessel during a severe accident / Außenkühlung des Druckgefäßes eines Druckwasserreaktors während eines schweren Störfalls was published on February 1, 1996 in the journal Kerntechnik (volume 61, issue 2-3).
The α → β transformation behavior and the temperature dependence of lattice strain of α‐AgI crystal frozen in an AgI‐based orthoborate glass matrix were investigated by differential scanning calorimetry and x‐ray diffraction in the temperature range from 20 to 180°C. After heating to various temperatures, the glass ma…
Summary Hydrogen-induced cracking (HIC) is a materials- and corrosion-related problem that occurs in surface production systems. Steels used to construct sour-gas production facilities and flowlines may corrode from wet hydrogen sulfide (H2S) gas in the production stream. The corrosion process generates hydrogen that…