Materials Literature
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The adsorption of Co 2 (CO) 8 onto dehydrated NaY powder under a N 2 atmosphere and into a tetrahydrofuran slurry of NaY under a CO/H 2 atmosphere predominately yielded supported Co 4 (CO) 12 and supported Co 6 (CO) 16, respectively. The molecular cobalt−carbonyl clusters and their decarbonylated products have been st…
The increased utilization of electrochemical noise measurement in corrosion research and industrial process monitoring prompted the formation in 1991 of an ASTM Task Group within the G1 Corrosion of Metals Committee. The scope of the task group was to “develop standards that describe instruments and methods for making…
Perchloric acid was used as a catalyst for butyrylation of krill chitin. Esterification was carried out under heterogeneous conditions using a large excess of butyric anhydride at 20°C and 40°C. The effect of catalyst concentration and duration of the reaction on molecular weight and yield of butyryl chitin was invest…
Sputtering conditions are investigated in order to deposit Fe-Pt thick film magnet. Argon pressure, input power, and target-substrate distance are determined to obtain a high maximum energy product film. Under the conditions, a film of 129μm thickness with a maximum energy product of 104 kJ/m3 (13.1 MGOe) is obtained.…
The state of the art in Monte Carlo simulations of scanning electron microscope (SEM) signals is reviewed. Two Monte Carlo computer codes were written to simulate the transmitted-, backscattered-, and secondary-electron signals from targets in a scanning electron microscope. The first, MONSEL-11, is applied to semi-in…
The local structural arrangement of ions around a substitutional Cr 3+ ion in sapphire (ruby) has been studied experimentally using extended X‐ray absorption fine structure (EXAFS) in the vicinity of the Cr absorption edge. The findings are compared with an ionic model (Mott‐Littleton) computation using two sets of pa…
The solution of the cubic crystal form (a = 167.8 A) of concanavalin A complexed with the monosaccharide methyl alpha-D-glucopyranoside is described. The space group has been determined as I2(1)3 rather than I23. The use of cadmium to replace cobalt at the transition metal-ion binding site and to replace calcium at it…
The literature on the setting mechanisms of dental amalgams made from powders of silver-rich alloys of tin and/or copper has been critically reviewed. In Part 1 of the review, the microstructure and phase content of recently set amalgams are described. The composition, morphology, and location of product phases are em…
Flashover of wet polluted insulation is caused by the propagation of arcs along the electrolytic surface. Several factors affect this flashover process under actual operating conditions. These include the variation in pollution resistance due to arc root movement and thermal effects. The difference between the dischar…
Eight different nickel porphycenes bearing substituents on the pyrrole β and/or ethylenic carbon positions of the macrocycle were investigated as to their redox properties in benzonitrile containing 0.1 M tetrabutylammonium perchlorate. Half-wave potentials were utilized to evaluate the effect of substituents and exte…
Reaction of manganese(II) perchlorate hexahydrate with a methanol solution of 1-thia-4,7-diazacyclononane ([9]aneN(2)S) resulted in the isolation of the manganese(II) complex [Mn([9]aneN(2)S)(2)](ClO(4))(2). The X-ray structure of this complex is reported: crystal system orthorhombic, space group Pbam, No. 55, a = 7.9…
Abstraet-The laser contact angle goniometry technique was applied to measure the wettability of water droplets on polymer surfaces in different normal alkanes. Using the modified two-liquid contact angle technique and the model recently proposed by us, we can determine the dispersive and non-dispersive (acid-base) con…
The adsorption and reaction of maleic anhydride and deuterated maleic anhydride on Mo(110), monolayer Pd/Mo(110), and multilayer Pd(111)/Mo(110) surfaces have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). Maleic anhydride adsorbs irreversibly…
Mononuclear nitrido complexes of Cr and Mo, NCr(OBut)3 and NMo(OSiMe3)3(py), are synthesized; the chromium complex has an idealized C3ν symmetry while the molybdenum complex has a distorted square-pyramidal geometry with the nitrido ligand at apical position; the N–Cr distance is 1.538(5)Å while the average N–Mo dista…
Dithizone and thiosemicarbazide were investigated as inhibitors of the corrosion of type 304 stainless steel in 1·0M sulphuric acid solution by studying weight loss, polarisation curves, and polarisation resistance and using scanning electron microscopy and Auger electron spectroscopy. Various corrosion parameters suc…
Biodegradations of random copolymers of ( R )-3-methyl-4-oxa-6-hexanolide [( R )-MOHEL] with various lactones such as ε-caprolactone (24/76 ratio), δ-valerolactone (22/78), and β-propiolactone (31/69) were examined with normal or acclimated activated sludge. As a consequence, the biodegradability was found to increase…
Core losses of an 18.5 kW asynchronous motor were measured and computed, by means of a suitable electromagnetic fields package, improved for core loss calculation. The results show that a 1 to 3% improvement in efficiency is possible by replacing the conventional soft laminations by new materials. The differences betw…
The synthesis of a new class of high-barrier polymers, poly(hydroxy amide ethers), is described. The polymers are formed by the reactions of bisphenol-A diglycidyl ether, OCH 2 CHCH 2 OC 6 H 4 C(CH 3 ) 2 C 6 H 4 OCH 2 CHCH 2 O, and amide-containing bisphenols of the general formula HOC 6 H 4 NHC(O)RC(O)NHC 6 H 4 OH [R…
Poly(siloxyethylene glycol) (PSEG), which consists of alternating oligo(dimethylsiloxane) and oligo(ethylene glycol) (OEG) units in the main chain, was synthesized through polycondensation reactions between oligosiloxane having two diethylamino groups and OEG. The molecular weight of the polymer was in the range 3500−…
The electronic structure of small clusters forming the inorganic cores in cadmium thiolate complexes is analyzed on the basis of semiempirical quantum chemical calculations. Orbital energies, atom charges, and peculiarities of chemical bond formation are considered for sphalerite lattice fragments Cd x S y ( x ≤ 20, y…