Materials Literature
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Abstract The corrosion behavior of stainless steels, titanium and copper alloys exposed to flowing Pacific Ocean water was characterized using surface analytical and electrochemical techniques. Biofilm formation on stainless steels and titanium resulted in thin films of bacteria and diatoms that did not cause signific…
It is proposed that the ‘cross-over’ of enthalpy associated with the structural relaxation of a vitreous solid can be conveniently studied by differential scanning calorimetry using thermal scans. Observations on a network structure (0·4 Na2O, 0·1 CaO, 0·05 A12O3, 0·05 SiO2, 0·4 P2O5), a linear-chain polymer (poly met…
Abstract Most residual soils occurring in the southeastern USA have formed in saprolite. Between the saprolite and the argillic horizon lies a zone that divides material undergoing pedogenesis from that undergoing geochemical processes. We examined the physical, chemical, mineralogical, and micromorphological properti…
This contribution examines the influence of nitrogen impurity on the radiation detecting properties of synthetic diamonds. The relatively low sensitivity of the commonly available synthetic diamonds, when used as dosimeters/detectors, is attributed to the presence of nitrogen. A systematic decrease of the nitrogen lev…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Gary R. Hamed; Energy Dissipation and the Fracture of Rubber Vulcanizates. Rubber Chemistry and Technology…
The intensity behavior of the specular beam in reflection high-energy electron diffraction (RHEED) from GaAs(111)B grown by molecular-beam epitaxy (MBE) is investigated for various growth and diffraction conditions. The temporal behavior during the initial growth of a buffer layer is examined at a fixed diffraction co…
The metal hexacyanometalate films, Prussian blue (PB), Ni hexacyanoferrate (NiHCF), and Cu hexacyanoferrate (CuHCF), were studied for their ability to poise the potential of an oxide‐covered metal in a stable, passive region of voltage. This requires the films to catalyze oxygen reduction, and oxygen reduction on PB f…
A mathematical model of the performance of an aluminum‐air single cell with caustic electrolyte has been developed along with an efficient solution algorithm. The model includes kinetic expressions for the cathode and anode along with the aluminum corrosion reaction. The effects of mass transfer, migration, gas evolut…
Abstract A series of liquid‐crystalline polystyrene derivatives with ω‐(4‐(4‐fluorophenylazo)phenoxy)‐alkoxy pendant groups have been synthesized and characterized. Homologues with four or more methylene units in the spacer chain exhibit smectic liquid‐crystalline phases, while the homologue with three methylene units…
Five fossil species of Rhizosolenia are known only from the distal parts of the valve. The resemblance of these tubular structures to the proboscis of the modern genus Proboscia Sundström, together with the possession of spinulae and a longitudinal slit, suggests that these species should be transferred to Proboscia.…
We report zero-field muon spin rotation studies of the organic compound (TMTSF) 2 PF 6 at ambient pressure. An extremely sharp onset of the spin density wave state (SDW) is observed below the transition temperature T M = 12.2 K, which may be first order in nature. The saturation of the magnetic order at low temperatur…
The structure of dislocations in L12 ordered γ′ single crystals (Ni3Ga and Ni3Al) deformed at 77 K has been studied by high resolution transmission electron microscopes. 〈110〉 superdislocations have been observed to dissociate into 〈112〉/3 super-Shockley partials coupled by superlattice intrinsic stacking faults (SISF…
The crystal lattices and crystal structures of franckeite and cylindrite have been restudied using transmission electron microscopy. The selected-area diffraction, convergent-beam diffraction and high-resolution electron microscopy observations revealed that the relations between the two lattices and between the latti…
The contribution of impurity ions to the total optical absorption of a heavy metal fluoride glass has been determined at 532 and 1064 nm. Four ZrF4-BaF2-LaF3-AlF3-NaF glasses were prepared from various purity raw materials. The absorption coefficients of these glasses range from 0.92 to 45.4×10−4 cm−1 at 1064 nm and f…
Abstract The formation of short‐range ordered aluminosilicates is substantially influenced by organic and inorganic ligands, metallic cations, and montmorillonite. Chemical composition, size, number, and nature of the functional groups, and concentrations of non‐humified organic acids play a vital role in perturbing t…
Abstract New functional aliphatic polyamides bearing pendant carboxylic acid and tertiary alcohol groups have been synthesized by step‐growth polymerization of protected citric acid in the diacyl chloride activated form and protected L‐lysine using the interfacial method. It has been found that a secondary reaction oc…
Abstract A New class of highly electroactive hydride‐forming compounds is described as well as simple metallurgical methods for producing these materials. The new type of metal alloys consist of two different crystallographic phases. The bulk phase is responsible for hydrogen storage and is formed by the stable multic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metals complexed to ordered mesophases. Synthesis, mesomorphic behavior and EPR investigations on a homologous series of N-(4-alkoxysalicylidene)-4'-alkylanilines complexed to copper(II)Mauro Ghedini, Stefania Morrone, Dante Gatteschi, and Claudia ZanchiniCite thi…
Anisotropic materials made from stacked macrocycles have potential applications as organic conductors and nonlinear optical materials. Using self-consistent-field local density theory, we have been exploring the ground and excited state electronic structures of metal substituted tetraazaporphyrins, phthalocyanines, an…
The electron backscatter data derived by Klevenhagen et al. (1982) and Hunt et al. (1988) were found to correlate well and were fitted to an empirical exponential expression valid between 3 and 35 MeV and atomic numbers between 4 and 82. In evaluating the formula, a (Z + 1) term was used at low atomic numbers and Z al…