Materials Literature
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An investigation of the causes and mechanisms of severe exfoliation corrosion damage in aluminum pipe irrigation networks utilizing fresh water has been conducted, making use of electron microscopy and microanalysis techniques, together with chemical and electrochemical methods. Pipes were made of (6000) series alloys…
The hydrodynamics of biaxial nematics has been obtained in the presence of an external field $\stackrel{\ensuremath{\rightarrow}}{H}$. By working with the triad order parameter, we obtain results valid for arbitrary nonsingular textures. We also present the bending energy for biaxial nematics. Our derivation of the hy…
The relationship between polymerisation-depolymerisation reactions and the formation of colloids has been studied for silicate solutions lying in that area of the pH-concentration diagram commonly referred to as the instability region. Changes in both acidic and basic solutions have been followed by a variety of techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper-assisted addition of 3(5)-methylpyrazole to acetaldehyde. Synthesis, structure, and magnetism of a unique tetranuclear copper(II) compound: bis[.mu.-[1-(1-ethanoyl)-5-methylpyrazolato-N2,O]]-tetrakis[.mu.-[3(5)-methylpyrazolato-N1,N2]]-bis(nitrato)tetracopper(II)Richa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome aspects of the electronic structures of a series of trimeric transition-metal cluster complexesAlbert B. Rives, Xiao Zeng You, and Richard F. FenskeCite this: Inorg. Chem. 1982, 21, 6, 2286–2294Publication Date (Print):June 1, 1982Publication History Published online1 M…
Critical review of the literature on iron(I) and iron(IV) porphyrins reveals many ambiguities in the assigned spin and oxidation states. The question of whether a redox reaction has occurred at the iron atom or at the porphyrin ring in highly reduced or highly oxidized complexes is not semantic and can usually be deci…
Some wholly aromatic polyamides derived from unsubstituted and chloro- and nitro-substituted diamines have been studied from the viewpoint of their thermal stability, thermo-oxidative stability, and thermal transitions. General relationships between thermal stability of a polymer and its chemical structure are describ…
The amplitude and phase of a wave scattered by an adsorbed layer can be deduced from the modifications of the Bragg peak of the powder by adsorption. The treatment of experimental data involves the interpretation of a function of the extra intensity detected and has the advantages of an integrated intensity method. Po…
Silica glass has not been fully characterized as a host material for glass lasers. To evaluate the intrinsic fluorescent characteristics of Nd-doped SiO 2 glass, a plasma torch CVD system was specially designed for the preparation of clear high purity glasses. Both of the observed fluorescences of Nd 3+ ( 4 F 3/2 – 4…
Abstract Model hard segments from MDI and different chain extenders have been studied by DSC. Among the studied α‐ω alkane diol‐type chain extenders, all giving crystalline hard segments, butane diol shows the highest melting temperature, while other types such as 1,4‐diaminobutane, 1,4‐benzene dimethanol, and 4,4′‐me…
The present compressed gas insulated transmission systems using SP6 are being operated well below the dielectric capability of the gas. Improvements in reliability and operation at higher stresses could be achieved in these transmission systems if the effect of particle contamination could be eliminated. Results from…
Indirect methods for introducing sulfonate groups into polyethylene, using the preirradiation technique, were studied. One of the methods involved graft polymerization of 2,3-epoxypropyl acrylate into polyethylene followed by sulfonation of the epoxy ring with bisulfite. The hydroxy sulfonate thus obtained was unstabl…
As a consequence of several technological developments, the speed and sensitivity of solution X-ray (and neutron) scattering studies have recently risen by factors which may be as large as 105; formal problems – like assessing the information content of the data and retrieving that information in structural terms – ha…
The leaching of complex polyphase nuclear waste ceramics is described in the context of the geochemically established dissolution behavior of the constituent phases. Static leach tests conducted on ceramic monoliths in deionized water, in simulated silicate, and in brine groundwaters, conforming to Materials Character…
Abstract A non‐agglomerating 15 μm diameter stainless steel spherical powder was used as a filler in a low‐density polyethylene matrix. The factors investigated included volume loading, the use of surface treatments, and method of applying the surface treatments. The rheological parameters measured to analyze the effe…
Abstract The nickel arsenate KNiAsO 4 has a mica-like layer structure with surface charge densities similar to brittle micas. In contrast to micas it easily exchanges alkylammonium ions. The interlayers have paraffin-type chain arrangements, as in alkylammonium vermiculites and alkylamine smectites and vermiculites, b…
Abstract Naturally occurring ammonium illites have been discovered in black shales surrounding a stratiform base metal deposit in the DeLong Mountains, northern Alaska. Infrared spectra of the samples exhibit pronounced absorption at 1430 cm −1 , the resonant-banding frequency for NH 4 + coordinated in the illite inte…
Grain boundary corrosion of niobium bicrystals has been investigated using interference microscopy, and the corrosion correlated with the boundary energy. Penetration cusps (minima) were observed near the boundaries of the coincidence site lattice.
The room‐temperature strength distributions of a sintered and a hot‐pressed Si 3 N 4 were examined in the as‐machined condition, after oxidation at 1370°C and after oxidation under load at 1370°C. The strength‐controlling flaw populations were highly transient in nature. Both the duration of oxidation and the magnitud…
Melt rheology of poly(ethylene terephthalate)–polyamide-6,6, and their blends was studied between 240°C and 300°C, in capillary and rotational rheometers. The flow curves were determined in the range of rate shear from about 10−2to 105 (s−1). The results indicate a considerable degree of compatibility, presence of ass…