Materials Literature
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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…
1. A preliminary survey of plastics . Terms and definitions. Classification of plastics. Nomenclature of plastics. Glossary of plastics. General literature guide. 2. Fundamentals of the theory of combustion . Definition of combustion. Chemical and physico-chemical processes of combustion. The course of combustion. The…
Abstract Synthetic allophanes were prepared by adding excess CaCO 3 to solutions containing Al(NO 3 ) 3 and Si(OH) 4 (concentrations ≤1.5 m M ) with molar Si/Al starting ratios ranging from 1:8 to 4:1. The systems were incubated at 20 and 80 °C until the concentration of Si(OH) 4 in solution approached stability after…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelically arranged azobenzene chromophores along a polypeptide chain. 1. Synthesis and circular dichroismMasahiko Sisido, Yoshihiro Ishikawa, Kenjy Itoh, and Shigeo TazukeCite this: Macromolecules 1991, 24, 14, 3993–3998Publication Date (Print):July 1, 1991Publication Histor…
We present a quantitative analysis of ac electrical conductivity and dielectric constant measurements that were performed on boron carbide samples. This material is crystalline but disordered on the atomic scale because of the existence of a large stoichiometry range from B9C to B4C. The polaronic character of the hop…
We present a real-space renormalization-group method for calculating the exact local and average Green's functions for generalized Fibonacci lattices. The fundamental requirement of the present method is that one should be able to split the original lattice into a finite number of sublattices, all of which need not be…
In situ experiments have been carried out using a field emission scanning electron microscope (Hitachi S-800) in order to characterize the dynamic behavior of electromigration (EM) voids under high spatial resolution. These experiments have shown how the EM voids move against the electron wind either in passivated or…
Large single crystals (60×20×8 mm3) of a new nonlinear crystal thienylchalcone (T-17) were grown from acetone by the falling temperature method and the nonlinear optic properties were determined. The effective nonlinear optical coefficient, the angular acceptance (Δθ,Δφ), and the walk-off angle were 7.1 pm/V, 0.053° c…
Results of x-ray measurements on the various columnar mesophases of multi-ethers of the naturally occurring stereoisomers myo- and scyllo-inositol are presented. Depending on the number of alkyl substituents at their inositol cores such derivatives show interesting kinds of molecular organization in their liquid-cryst…
Deformation and breakup of immiscible fluids in deterministic chaotic flows is governed by self-similar distributions of stretching histories and stretching rates and produces populations of droplets of widely distributed sizes. Scaling reveals that distributions of drop sizes collapse into two self-similar families;…
Abstract Infrared (IR) microscopic analysis was performed in tandem with traditional techniques of fiber analysis in case studies in order to determine the feasibility of IR microscopy as a routine technique for fiber analysis. All fibers which were comparable by visual, optical microscopy were also found to be compar…
In order to protect metallic structures from marine corrosion, cathodic protection using sacrificial anodes or impressed current is widely used. In aerated seawater steel is considered to be protected when a cathodic potential of — 800 mV/SCE (Saturated Calomel Electrode) is applied. However, in many cases, this poten…
We have measured in situ M\"ossbauer spectra of iron hydride made in a diamond anvil cell at high pressure and room temperature. The spectra show a sudden change at 3.5\ifmmode\pm\else\textpm\fi{}0.5 GPa from a single hyperfine pattern to a superposition of three. The former pattern results from normal \ensuremath{\al…